BEGIN:VCALENDAR PRODID:-//Google Inc//Google Calendar 70.9054//EN VERSION:2.0 CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:Department of Physics Calendar X-WR-TIMEZONE:America/New_York X-WR-CALDESC:Physics Calendar Events for Seminars\, Colloquium\, Special Ev ents and Programs BEGIN:VTIMEZONE TZID:America/New_York X-LIC-LOCATION:America/New_York BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:19700308T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:19701101T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART:20220907T150000Z DTEND:20220907T160000Z DTSTAMP:20220808T214455Z UID:45hitjsope3pvdh323oueesqec@google.com CREATED:20220808T135034Z DESCRIPTION:Title: To be announced\nSpeaker: Ulysse Chabaud (Caltech)\nTi me: Wednesday\, September 7\, 2022 - 11:00am\nLocation: ATL 3100A and Vir tual Via Zoom: To be announced\n\nThe title and abstract for this talk are forthcoming. LAST-MODIFIED:20220808T135034Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Ulysse Chabaud TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220919T150000Z DTEND:20220919T160000Z DTSTAMP:20220808T214455Z UID:2lu2j9ktjr2l2hpdp0opg3litm@google.com CREATED:20220804T163038Z DESCRIPTION:Speaker: Nicole Yunger Halpern (QUICS/JQI)


Title: \;A Tale of Two Disciplines: Non-Abelian Eigenstate Thermalization Hypothesis

Abstra ct: \;Why do chaotic quantum many-body systems thermalize internally? T he eigenstate thermalization hypothesis (ETH) explains why if the Hamiltoni an lacks degeneracies. If the Hamiltonian conserves one quantity ("charge") \, the ETH implies thermalization within an eigenspace of the charge—in a m icrocanonical subspace. However\, quantum systems can have charges that fai l to commute with each other and so share no eigenbasis\; microcanonical su bspaces may not exist. Worse\, the Hamiltonian will have degeneracies\, so the ETH need not imply thermalization. We adapt the ETH to noncommuting cha rges by positing a non-Abelian ETH and invoking the approximate microcanoni cal subspace introduced in quantum thermodynamics. We apply the non-Abelian ETH in calculating local observables' time-averaged expectation values. In many cases\, we prove\, the time average thermalizes. However\, we find an omalous corrections to thermal predictions under a physically reasonable as sumption. This work bridges noncommuting charges\, recently on the rise in quantum thermodynamics\, to the ETH\, a cornerstone of many-body physics.

References
-Murthy\, Babakhani\, Iniguez\, Srednicki\, and NYH\, arXiv: 2206.05310 (2022).
-NYH and Majidy\, npj Quantum Information 8\, 10 (202 2).
-Kranzl\, Lasek\, Joshi\, Kalev\, Blatt\, Roos\, and NYH\, arXiv:220 2.04652 (2022).

LAST-MODIFIED:20220804T163118Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Nicole Yunger Halpern TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220829T150000Z DTEND:20220829T160000Z DTSTAMP:20220808T214455Z UID:3omhr9ducoufgiudfn9g11lj33@google.com CREATED:20220804T162256Z DESCRIPTION:Speaker: Alex Ling (National University of Singapore )


Title: \;Bui lding Quantum Networks from Space: Lessons from SPOOQY-1

Abstract: T he SpooQy-1 project designed\, built and operated a source of polarisation entangled photon-pairs onboard a CubeSat for over 600 days. From the lesson s learned in the SpooQy-1 mission\, the Singapore-based team is working tow ards performing entanglement distribution from a small satellite to ground receivers. In this talk\, I will share observations about the performance o f the satellite\, the entangled photon source\, and the single photon detec tors in orbit. These data has been used to validate some very useful models for predicting the effect of radiation on components. From these first ste ps\, the Singapore-based team is building towards entanglement distribution from a small satellite to ground receivers. I will share these plans\, and suggest possible paths for collaboration. Looking further towards the futu re\, I will discuss what are some of the challenges my team sees in moving towards the concept of a quantum internet that is augmented from space.

Alex Ling is the head of the Singapore Quantum Engineering program and is a notable technical contributor to quantum optics in space.
LAST-MODIFIED:20220804T162459Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar - Alex Ling TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221207T160000Z DTEND:20221207T170000Z DTSTAMP:20220808T214455Z UID:0c602qdgqkebifqkqarkaddu60@google.com CREATED:20220804T155746Z DESCRIPTION:Speaker: Dr. Bern Kohler\, Ohio State University\n\nTitle: TBA LAST-MODIFIED:20220804T155746Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221201T160000Z DTEND:20221201T170000Z DTSTAMP:20220808T214455Z UID:1mouhirigk5ideg0d417hkr7l9@google.com CREATED:20220804T155645Z DESCRIPTION:Literature Seminar\n\nSpeaker: Kwaku Obeng\, UMCP\n\nTitle: TBA LAST-MODIFIED:20220804T155645Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221130T160000Z DTEND:20221130T170000Z DTSTAMP:20220808T214455Z UID:0b7suigc13pqm5k6d6col1lso6@google.com CREATED:20220804T155543Z DESCRIPTION:Speaker: Dr. Kit Bowen\, Johns Hopkins University\n\nTitle: TBA LAST-MODIFIED:20220804T155543Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221117T160000Z DTEND:20221117T170000Z DTSTAMP:20220808T214455Z UID:0erjd7ccrjveohj8dd12c035af@google.com CREATED:20220804T155444Z DESCRIPTION:Literature Seminar\n\nSpeaker: Manny Bazan-Bergamino\, UMCP\n\n Title: TBA LAST-MODIFIED:20220804T155444Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221116T160000Z DTEND:20221116T170000Z DTSTAMP:20220808T214455Z UID:6bhnk1adbnpev08hfqn053qe11@google.com CREATED:20220804T155351Z DESCRIPTION:Literature Seminar\n\nSpeaker: Simone DeSouza\, UMCP\n\nTitle: TBA LAST-MODIFIED:20220804T155351Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221110T160000Z DTEND:20221110T170000Z DTSTAMP:20220808T214455Z UID:0kdrbm6bnjf7up4bstbqmr79u9@google.com CREATED:20220804T155255Z DESCRIPTION:Literature Seminar\n\nSpeaker: Jou-Tsen (Olie) Ou\n\nTitle: TBA LAST-MODIFIED:20220804T155256Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221109T160000Z DTEND:20221109T170000Z DTSTAMP:20220808T214455Z UID:1sd7dn43aq7okd161kgh0s22lt@google.com CREATED:20220804T155157Z DESCRIPTION:Literature Seminar\n\nSpeaker: Hector Cein Mandujano\, UMCP\n\n Title: TBA LAST-MODIFIED:20220804T155157Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221102T150000Z DTEND:20221102T160000Z DTSTAMP:20220808T214455Z UID:2nl9ff4f0k6ohkinm6g00nlmia@google.com CREATED:20220804T155040Z DESCRIPTION:Literature Seminar\n\nSpeaker: Seungyeop Lee\, UMCP\n\nTitle: T BA LAST-MODIFIED:20220804T155040Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221027T150000Z DTEND:20221027T160000Z DTSTAMP:20220808T214455Z UID:5fi5tlfji7s93nhd18ao34tn4n@google.com CREATED:20220804T154855Z DESCRIPTION:Literature Seminar\n\nSpeaker: Collin Vincent\, UMCP\n\nTitle: TBA LAST-MODIFIED:20220804T154855Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221026T150000Z DTEND:20221026T160000Z DTSTAMP:20220808T214455Z UID:459l1vug1n18o7b5l5453i79vo@google.com CREATED:20220804T154802Z DESCRIPTION:Speaker: Dr. David Long\, NIST\n\nTitle: TBA LAST-MODIFIED:20220804T154802Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221020T150000Z DTEND:20221020T160000Z DTSTAMP:20220808T214455Z UID:70m2lpt4qi8iim33m3cv133sqi@google.com CREATED:20220804T154711Z DESCRIPTION:Literature Seminar\n\nSpeaker: Min Chieh (Jack) Yang\, UMCP\n\n Title: TBA LAST-MODIFIED:20220804T154711Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221013T150000Z DTEND:20221013T160000Z DTSTAMP:20220808T214455Z UID:0rtjjtovjebefhfrv04qg6f4fg@google.com CREATED:20220804T154608Z DESCRIPTION:Speaker: Dr. Natalia Shustova\, University of South Carolina\n\ nTitle: TBA LAST-MODIFIED:20220804T154608Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221012T150000Z DTEND:20221012T160000Z DTSTAMP:20220808T214455Z UID:59k9v8p2chn0qkams0jhe2h5gu@google.com CREATED:20220804T154504Z DESCRIPTION:Literature Seminar\n\nSpeaker: Ovuokenye Omadoko\n\nTitle: TBA LAST-MODIFIED:20220804T154504Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221006T150000Z DTEND:20221006T160000Z DTSTAMP:20220808T214455Z UID:4ehrec37pv328pqce9h57ug4p3@google.com CREATED:20220804T154354Z DESCRIPTION:Literature Seminar\n\nSpeaker: Prahadeesh Nagaretnam\, UMCP\n\n Title: TBA LAST-MODIFIED:20220804T154354Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220929T150000Z DTEND:20220929T160000Z DTSTAMP:20220808T214455Z UID:0rkmqidapnsptj8tnjp5qv2dlm@google.com CREATED:20220804T154256Z DESCRIPTION:Annual Russell Marker Lecture\n\nSpeaker: Dr. David MacMillan\, Princeton University\n\nTitle: TBA LAST-MODIFIED:20220804T154256Z LOCATION:Chemistry Building\, Room 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220928T150000Z DTEND:20220928T160000Z DTSTAMP:20220808T214455Z UID:7f1rv5dk7vrns4u165o7h6app3@google.com CREATED:20220804T154102Z DESCRIPTION:Speaker: Dr. Susanna Widicus Weaver\, University of Wisconsin-M adison\n\nTitle: TBA LAST-MODIFIED:20220804T154102Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220915T150000Z DTEND:20220915T160000Z DTSTAMP:20220808T214455Z UID:186pmevpgiqq9opkai1siqaa2d@google.com CREATED:20220804T153948Z DESCRIPTION:Speaker: Dr. Justin Kennemur\, Florida State University\n\nTitl e: TBA LAST-MODIFIED:20220804T153948Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220914T150000Z DTEND:20220914T160000Z DTSTAMP:20220808T214455Z UID:6t3g6so42u49i3cdfetqpvkcqh@google.com CREATED:20220804T153855Z DESCRIPTION:Speaker: Dr. John Straub\, Boston University\n\nTitle: TBA LAST-MODIFIED:20220804T153855Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220908T150000Z DTEND:20220908T160000Z DTSTAMP:20220808T214455Z UID:0jh3d9e9kbnrep0j7pbvoq4l09@google.com CREATED:20220804T153758Z DESCRIPTION:Speaker: Dr. Samarjit Patnaik\, NIH\n\nTitle: TBA LAST-MODIFIED:20220804T153758Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220907T150000Z DTEND:20220907T160000Z DTSTAMP:20220808T214455Z UID:0c14dtsc93bitmsqdtb89lnil0@google.com CREATED:20220804T153657Z DESCRIPTION:Speaker: Dr. John Fourkas\, UMCP\n\nTitle: TBA LAST-MODIFIED:20220804T153657Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221103T150000Z DTEND:20221103T160000Z DTSTAMP:20220808T214455Z UID:6eob8mplet96acrrqsfjspus64@google.com CREATED:20220804T140642Z DESCRIPTION:Speaker: Dr. Weiping Tang\, University of Wisconsin-Madison\n\n Title: New Synthetic Methods in Carbohydrate Chemistry and Drug Discovery b y Targeted Protein Degradation LAST-MODIFIED:20220804T140642Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221019T150000Z DTEND:20221019T160000Z DTSTAMP:20220808T214455Z UID:5ukmq4u9hvl35mfn8lqmsijmp5@google.com CREATED:20220804T140354Z DESCRIPTION:Speaker: Dr. You Zhou\, UMCP\n\nTitle: Wigner Crystals in Atomi cally Thin Heterostructures LAST-MODIFIED:20220804T140506Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220922T150000Z DTEND:20220922T160000Z DTSTAMP:20220808T214455Z UID:7pjccbdjeeg2v4vl8kmv8fqbo7@google.com CREATED:20220804T135937Z DESCRIPTION:Speaker: Dr. Dong-Sheng Guo\, Nankai University\n\nTitle: Deep- cavity Azocalixarenes: Molecular Recognition and Drug Delivery LAST-MODIFIED:20220804T135938Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220901T150000Z DTEND:20220901T160000Z DTSTAMP:20220808T214455Z UID:01mm9n47i5vadkhb27bjvl0sit@google.com CREATED:20220804T135731Z DESCRIPTION:Speaker: Dr. Ngong Kodi Beyeh\, Oakland University\n\nTitle: Ca vity-containing Macrocycles as Components of Sensory Biohybrid Materials LAST-MODIFIED:20220804T135731Z LOCATION:Chemical and Nuclear Engineering Building\, Room 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220829T190000Z DTEND:20220829T203000Z DTSTAMP:20220808T214455Z UID:4bopi725g82p7sg72iqtcm41ev@google.com CREATED:20220719T134217Z DESCRIPTION:Speaker: Arushi Bodas\, UMD

Title and abstrac t: tk
LAST-MODIFIED:20220729T182350Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220811T180000Z DTEND:20220811T190000Z DTSTAMP:20220808T214455Z UID:6h2g7ute0mv7co13306danegrb@google.com CREATED:20220729T023414Z DESCRIPTION:Title: Uncertainty Relations from Graph Theory\nSpeaker: Kiar a Hansenne (Universität Siegen)\nTime: Thursday\, August 11\, 2022 - 2:00p m\nLocation: Virtual Via Zoom: https://um d.zoom.us/j/7068476897\n\nQuantum measurements are inherently probabili stic. Further defying our classical intuition\, quantum theory often forbid s us to precisely determine the outcomes of simultaneous measurements. This phenomenon is captured and quantified through uncertainty relations. Altho ugh studied since the inception of quantum theory\, this problem of determi ning the possible expectation values of a collection of quantum measurement s remains\, in general\, unsolved.\n\nIn this talk\, we will go over some b asic notions of graph theory that will allow us to derive uncertainty relat ions valid for any set of dichotomic quantum observables. We will then spec ify the many cases for which these relations are tight\, depending on prope rties of some graphs\, and discuss a conjecture for the untight cases. Fina lly\, we will show some direct applications to several problems in quantum information\, namely\, in constructing entropic uncertainty relations\, sep arability criteria and entanglement witnesses. LAST-MODIFIED:20220729T023414Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/7068476897 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Kiara Hansenne TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220804T140000Z DTEND:20220804T150000Z DTSTAMP:20220808T214455Z UID:7lc6lrqt3tmfbhuftgs2lvrl8g@google.com CREATED:20220729T022748Z DESCRIPTION:Title: Strong converse bounds for compression of mixed states\ nSpeaker: Zahra Khanian (Technical University of Munich)\nTime: Thursday\ , August 4\, 2022 - 10:00am\nLocation: Virtual Via Zoom: https://uwate rloo.zoom.us/j/98435686246?pwd=YWlGZWRzSUNJMGpaVjRuWnFjRlo0Zz09\n\nThe optimal rates for compression of mixed states was found by Koashi and Imoto in 2001 for the blind case and by Horodecki and independently by Hayashi f or the visible case respectively in 2000 and 2006. However\, it was not kno wn so far whether the strong converse property holds for these compression problems. In this work\, we show that the strong converse holds for the bli nd compression scheme. For the visible scheme\, the strong converse holds u p to the continuity of the regularized Renyi entanglement of purification. LAST-MODIFIED:20220729T022748Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/98435686246?pwd=YWlG ZWRzSUNJMGpaVjRuWnFjRlo0Zz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Zahra Khanian TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220912T190000Z DTEND:20220912T203000Z DTSTAMP:20220808T214455Z UID:23cc6aub186bi3jqnctecv1i8c@google.com CREATED:20220719T134601Z DESCRIPTION:Speaker: Amalia Madden\, Perimeter Institute \n\nTitle and Abs tract: tk LAST-MODIFIED:20220728T164516Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221107T200000Z DTEND:20221107T213000Z DTSTAMP:20220808T214455Z UID:5m0nlssjsrfl0bmpv8jbqg5v8o@google.com CREATED:20220728T164348Z DESCRIPTION:Speaker: Clara Murgui\, Caltech\n\nTitle and Abstract: tk LAST-MODIFIED:20220728T164348Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20221116T183000Z DTEND:20221116T200000Z DTSTAMP:20220808T214455Z UID:2j2ebvk5e1k51q2traip248fi8@google.com CREATED:20220727T185750Z DESCRIPTION:Seminar will be at Johns Hopkins University.

Proceeded by lunch at 12:30pm.

Speaker: \;Bo Jayatilaka\, Fermil ab

Title and abstract: tk
LAST-MODIFIED:20220727T185750Z LOCATION:JHU SEQUENCE:0 STATUS:CONFIRMED SUMMARY:*Special Joint JHU/UMD Seminar* TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220928T173000Z DTEND:20220928T190000Z DTSTAMP:20220808T214455Z UID:3nhoelk69ikbde4mgfg6dlubkr@google.com CREATED:20220727T185343Z DESCRIPTION:Speaker: John Doyle\, Harvard \n\nWill be preceded by lunch at 12:30pm LAST-MODIFIED:20220727T185343Z LOCATION:JHU SEQUENCE:0 STATUS:CONFIRMED SUMMARY:*Special Joint JHU/UMD Seminar* TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220810T150000Z DTEND:20220810T160000Z DTSTAMP:20220808T214455Z UID:679vg4e1h97vgpdscc301hle4k@google.com CREATED:20220726T152007Z DESCRIPTION:Title: General guarantees for non-uniform randomized benchmark ing and applications to analog simulators\nSpeaker: Ingo Roth (Technology Innovation Institute)\nTime: Wednesday\, August 10\, 2022 - 11:00am\nLocat ion: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/2821742741?pwd=SWJ SRm1DTGFoYUtVMllVSEo5bzdmdz09\n\nRandomized benchmarking protocols have become the prominent tool for assessing the quality of gates on digital qu antum computing platforms. In `classical'\; variants of randomized benc hmarking multi-qubit gates are drawn uniformly from a finite group. The fu nctioning of such schemes be rigorous guaranteed under realistic assumption s. In contrast\, experimentally attractive and practically more scalable r andomized benchmarking schemes often directly perform random circuits or us e other non-uniform probability measures. An important example for such a n on-uniform protocol is linear cross-entropy benchmarking. The theoretical u nderstanding of non-uniform randomized benchmarking is still an ongoing eff ort. We present a new extension of general theoretical guarantees for rand omized benchmarking to non-uniform measures. Combined with results on rando m walks\, our results identify experimental parameter regimes where one can guarantee non-uniform randomized benchmarking protocols to work reliably. One main motivation for the new guarantees is the development of trusted an d efficient randomized benchmarking schemes for analog quantum simulators. We discuss how the framework of non-uniform randomized benchmarking can be applied in the context of bosonic and fermionic analog quantum simulators. LAST-MODIFIED:20220727T005516Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/2821742741?p wd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS-QuICS Special Seminar: Ingo Roth TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220804T150000Z DTEND:20220804T163000Z DTSTAMP:20220808T214455Z UID:08aj6jfnvuvn03stjnkmlacc2r@google.com CREATED:20220726T181806Z DESCRIPTION:Title: Quantum Error Correction &\; Bosonic Coding: Bosonic Fock-state codes\nSpeaker: Victor Albert (QuICS)\nTime: Thursday\, Augus t 4\, 2022 - 11:00am\nLocation: ATL 3100A and Virtual Via Zoom: https://umd.z oom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 Meeting ID: 98 9 367 6372 Passcode: abc123\n\nLecture 3: Bosonic Fock-state codes\n\nI ov erview six use cases of bosonic encodings\, three of which circumvent no-go theorems due to the infinite-dimensionality of bosonic Hilbert space.\n\nJ oin Zoom Meeting\nhttps://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjk zTllvQT09\n\nMeeting ID: 989 367 6372\nPasscode: abc123\nOne tap mobile \n+16699006833\,\,9893676372# US (San Jose)\n+19294362866\,\,9893676372# US (New York)\n\nDial by your location\n+1 669 900 6833 US (San Jose)\n+1 929 436 2866 US (New York)\n+1 253 215 8782 US (Tacoma)\n+1 301 715 8592 US (W ashington DC)\n+1 312 626 6799 US (Chicago)\n+1 346 248 7799 US (Houston)\n +1 386 347 5053 US\n+1 564 217 2000 US\n+1 646 931 3860 US\n+1 669 444 9171 US\nMeeting ID: 989 367 6372\nFind your local number: https://umd.zoom.us/u/abF3cNNZ0B\n\nJoin by SIP\n9893676372@zoomcrc.com\n \nJoin by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114. 131.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amst erdam Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sy dney)\n103.122.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\n64 .211.144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toron to)\n65.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.1 37.24.110 (Japan Osaka)\nMeeting ID: 989 367 6372\nPasscode: 578842 LAST-MODIFIED:20220726T181806Z LOCATION: https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllv QT09 Meeting ID: 989 367 6372 Passcode: abc123 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bootcamp: Victor Albert TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220802T150000Z DTEND:20220802T163000Z DTSTAMP:20220808T214455Z UID:312nmtr2ouf7i6a28rcnvcqb3k@google.com CREATED:20220726T181151Z DESCRIPTION:Title: Quantum Error Correction &\; Bosonic Coding: Bosonic stabilizer codes\nSpeaker: Victor Albert (QuICS)\nTime: Tuesday\, August 2\, 2022 - 11:00am\nLocation: ATL 3100A and Virtual Via Zoom: https://umd.zo om.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc123\n\nLecture 2: Bosonic stabilizer codes\n\nI go over bosonic quantum memories\, organizing them into bosonic stabilizer cod es and bosonic Fock-state codes. \n\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/ 9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09\n\nMeeting ID: 989 367 6372\nPasscode: abc123\nOne tap mobile\n+16699006833\,\,9893676372# US (San Jose)\n+19294362866\,\,9893676372# US (New York)\n\nDial by your location\ n+1 669 900 6833 US (San Jose)\n+1 929 436 2866 US (New York)\n+1 253 215 8 782 US (Tacoma)\n+1 301 715 8592 US (Washington DC)\n+1 312 626 6799 US (Ch icago)\n+1 346 248 7799 US (Houston)\n+1 386 347 5053 US\n+1 564 217 2000 U S\n+1 646 931 3860 US\n+1 669 444 9171 US\nMeeting ID: 989 367 6372\nFind y our local number: https://umd.zoom.us/u/ab F3cNNZ0B\n\nJoin by SIP\n9893676372@zoomcrc.com\n\nJoin by H.323\n162.255.37.11 (US We st)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114.115.7 ( India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244.140.110 ( Germany)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Australia Melb ourne)\n149.137.40.110 (Singapore)\n64.211.144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toronto)\n65.39.152.160 (Canada Vancouver) \n207.226.132.110 (Japan Tokyo)\n149.137.24.110 (Japan Osaka)\nMeeting ID: 989 367 6372\nPasscode: 578842 LAST-MODIFIED:20220726T181151Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/9893676372?p wd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc1 23 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bootcamp: Victor Albert TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220801T150000Z DTEND:20220801T163000Z DTSTAMP:20220808T214455Z UID:3rtvuqtco5qvqq5mt71o1ud2de@google.com CREATED:20220726T181006Z DESCRIPTION:Title: Quantum Error Correction &\; Bosonic Coding: Introdu ction to quantum error correction\nSpeaker: Victor Albert (QuICS)\nTime: Monday\, August 1\, 2022 - 11:00am\nLocation: ATL 3100A and Virtual Via Zo om: https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc123\n\nLecture 1: Introduction to qu antum error correction\n\nI provide a brief introduction to the tenets of q uantum error correction using the four-qubit code\, making contact with con catenated\, CSS\, stabilizer\, and rotated surface codes. \n\nJoin Zoom Mee ting\nhttps://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09\n\nMeeting ID: 989 367 6372\nPasscode: abc123\nOne tap mobile\n+166990068 33\,\,9893676372# US (San Jose)\n+19294362866\,\,9893676372# US (New York)\ n\nDial by your location\n+1 669 900 6833 US (San Jose)\n+1 929 436 2866 US (New York)\n+1 253 215 8782 US (Tacoma)\n+1 301 715 8592 US (Washington DC )\n+1 312 626 6799 US (Chicago)\n+1 346 248 7799 US (Houston)\n+1 386 347 5 053 US\n+1 564 217 2000 US\n+1 646 931 3860 US\n+1 669 444 9171 US\nMeeting ID: 989 367 6372\nFind your local number: https://umd.zoom.us/u/abF3cNNZ0B\n\nJoin by SIP\n9893676372@zoomcrc.com\n\nJoin by H. 323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amsterdam Nether lands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sydney)\n103.1 22.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\n64.211.144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toronto)\n65.39.1 52.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.137.24.110 (J apan Osaka)\nMeeting ID: 989 367 6372\nPasscode: 578842 LAST-MODIFIED:20220726T181006Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/9893676372?p wd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc1 23 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Bootcamp: Victor Albert TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220802T171500Z DTEND:20220802T181500Z DTSTAMP:20220808T214455Z UID:685afuoinjc0lisiq4minb1d23@google.com CREATED:20220724T031210Z DESCRIPTION:Title: Noncommuting charges: Bridging theory to exp eriment
Speaker: Shayan Majidy (University of Waterloo\, IQC)
Time: Tuesday\, August 2\, 2022 - 1:15pm
Location: IPST 1116

Noncommu ting conserved quantities have recently launched a subfield of quantum ther modynamics. In conventional thermodynamics\, a system of interest and an en vironment exchange quantities—energy\, particles\, electric charge\, etc.—t hat are globally conserved and are represented by Hermitian operators. Thes e operators were implicitly assumed to commute with each other\, until a fe w years ago. Freeing the operators to fail to commute has enabled many theo retical discoveries—about reference frames\, entropy production\, resource- theory models\, etc. Little work has bridged these results from abstract th eory to experimental reality. This paper provides a methodology for buildin g this bridge systematically: we present a prescription for constructing Ha miltonians that conserve noncommuting quantities globally while transportin g the quantities locally. The Hamiltonians can couple arbitrarily many subs ystems together and can be integrable or nonintegrable. Our Hamiltonians ma y be realized physically with superconducting qudits\, with ultracold atoms \, and with trapped ions.

Yunger Halpern\, Nicole\, and Shayan Majid y. &\;quot\;How to build Hamiltonians that transport noncommuting charge s in quantum thermodynamics.&\;quot\; npj Quantum Information 8.1 (2022) : 1-7.



Note: Brown -bag lunch at the seminar room before the talk.
LAST-MODIFIED:20220726T162632Z LOCATION:IPST 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical-Physics Seminar: Shayan Majidy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220808T170000Z DTEND:20220808T180000Z DTSTAMP:20220808T214455Z UID:514oigmmel5rtat0pb47hggna1@google.com CREATED:20220722T155626Z DESCRIPTION:Speaker: Mishkat Bhattacharya from Rochester Institute of Techn ology\n\nTitle: Cavity Optomechanical Sensing and Manipulation of an Atomic Persistent Current\n\nAbstract: In this talk I will describe our recent th eoretical work showing how several problems in atomic superfluid rotation c an be addressed using the versatile toolbox of cavity optomechanics [1]. W e consider an annular Bose-Einstein condensate\, which exhibits dissipation less flow and is a paradigm of rotational quantum physics\, inside a cavity excited by optical fields carrying orbital angular momentum. We show that this configuration provides the first platform that can sense ring Bose-Ein stein condensate rotation with minimal destruction\, in situ and in real ti me\, unlike demonstrated techniques\, all of which involve fully destructiv e measurement. It also shows how light can actively manipulate rotating mat ter waves by optomechanically entangling persistent currents. Our work ope ns up a novel and useful direction in the sensing and manipulation of atom ic superflow.\n\n[1] P. Kumar\, T. Biswas\, K. Feliz\, R. Kanamoto\, M.-S. Chang\, A. K. Jha and M. Bhattacharya\, Phys. Rev. Lett. 127\, 113601 (2021 ).\n\nBio: Mishkat Bhattacharya is an Associate Professor of physics at the Rochester Institute of Technology\, Rochester\, NY. His interests lie in\n theoretical quantum optics. His research has been recognized with an NSF Ca reer award (2015) and was selected as one of the Breakthroughs\nof the Year by Optics and Photonics magazine (2019). LAST-MODIFIED:20220722T155804Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Special Seminar - Mishkat Bhattacharya TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20221005T150000Z DTEND:20221005T170000Z DTSTAMP:20220808T214455Z UID:5l699vkcd1tu4hmmbkphf8g38i@google.com CREATED:20220720T200455Z DESCRIPTION:
Speaker: Karmela Padavic-Callaghan

Institution: New Scientist

Karmela Padavic-Callaghan is a science w riter reporting on physics\, materials science and quantum technology for N ew Scientist. Karmela earned a PhD in theoretical condensed matter physics and atomic\, molecular\, and optical physics from the University of Illinoi s Urbana Champaign and her research has been published in peer reviewed jou rnals including Physical Review Letters and New Journal of Physics.
&nbs p\;
She studied ultracold atomic systems in novel geometries in microgra vity and the interplay of disorder and quasiperiodicity in one-dimensional systems\, including metamaterials.
 \;
Before joining New Scienti st\, Karmela was an Assistant Professor at Bard High School Early College i n New York City where she taught high-school and college courses in physics and mathematics. Her freelance writing has been featured in Wired\, Scient ific American\, Slate\, MIT Technology Review\, Quanta Magazine\, Symmetry Magazine\, and Physics World. \;
 \;
Karmela \;will discu ss careers in science communications and journalism and give some interview tips.
 \;
Co-sponsored by UMD Women in Physics (WiP)/Physicists of Underrepresented Genders (PUGs) \;
 \;
Note: attendance at JQI Career Seminars is limited to students\, postdoctoral associates and j unior members of the professional staff. Lunch will be provided to particip ants afterward and the speaker will be available for informal discussions.& nbsp\;  \;A list of recent JQI Career Seminars can be found at \;https://jqi.umd. edu/events/type/jqi-career-seminar
LAST-MODIFIED:20220720T200820Z LOCATION:PSC 2136 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JQI Career Seminar - Karmela Padavic-Callaghan TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220727T150000Z DTEND:20220727T160000Z DTSTAMP:20220808T214455Z UID:1fru3f194v4ggspp4js00i7q1k@google.com CREATED:20220719T172701Z DESCRIPTION:Title: Dualities in one-dimensional quantum latt ice models: symmetric Hamiltonians and matrix product operator intertwiners
Speaker: Laurens Lootens (Ghent University)
Time: Wednesday\, July 27\, 2022 - 11:00am
Location: ATL 3100A and Virtual Via Zoom: https://umd .zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09

Meeti ng ID: 989 367 6372
Passcode: abc123

Recently\, we presented a sy stematic recipe for generating duality transformations in one dimensional l attice models. Our construction is based on a detailed understanding of the most general kind of symmetry a one-dimensional lattice model can exhibit: categorical symmetries. These symmetries are conveniently described in the language of tensor networks\, where they are represented as matrix product operators. For a given lattice model with such categorical symmetries\, th eir mathematical description in terms of bimodule categories allows us to g enerate all possible dual models\, as well as explicit matrix product opera tor intertwiners that implement the dualities at the level of the Hilbert s pace.

In this talk\, I will provide an overview of these results by giving an introduction to matrix product operator symmetries\, the underlyi ng categorical structures and how they provide the right framework for stud ying dualities. I will discuss some well known examples to illustrate our f ramework\, and show how the categorical approach allows us to precisely rel ate the various symmetry sectors of dual models to each other.

Based on arXiv:2008.11187 and arXiv:2112.09091


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LAST-MODIFIED:20220719T172701Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/9893676372?p wd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc 123 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Laurens Lootens TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221213T160000 DTEND;TZID=America/New_York:20221213T170000 DTSTAMP:20220808T214455Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20221213T160000 CREATED:20210423T130624Z DESCRIPTION: LAST-MODIFIED:20220718T190834Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:DST Lecture: Michelle Girvan TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220719T180000Z DTEND:20220719T190000Z DTSTAMP:20220808T214455Z UID:0a2r2vtaqkkqr9j0gc6jssbasl@google.com CREATED:20220717T191541Z DESCRIPTION:Title: Sample-optimal classical shadows for pure states
Speaker: Hakop Pashayan (Free University Berlin)
Time: Tuesday\, Jul y 19\, 2022 - 2:00pm
Location: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/91917720452

Huang \, Kueng\, Preskill introduced the learning task now known as “classical sh adows”: given few copies of an unknown state ρ\, construct a classical desc ription of the state from independent measurements that can be used to pred ict certain properties of the state. Specifically\, they show Θ(B/epsilon^2 ) samples of ρ suffice to approximate the expectation value Tr(Oρ) of any H ermitian observable O to within additive error epsilon provided Tr(O^2) ≤ B and the eigenvalues of O are contained in [-1\,1]. We consider the task of constructing classical shadows with joint measurements and pure unknown st ates. We show Θ(√B/epsilon + 1/epsilon^2) copies are necessary and sufficie nt to construct classical shadows in this setting. LAST-MODIFIED:20220717T191541Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/91917720452 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Hakop Pashayan TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220721T180000Z DTEND:20220721T190000Z DTSTAMP:20220808T214455Z UID:1tmvdqc4lhn575mbq9ts3f0v7v@google.com CREATED:20220715T170953Z DESCRIPTION:Title: A sufficient family of necessary inequalities for the q uantum marginals problem\nSpeaker: TC Fraser (Perimeter Institute)\nTime: T hursday\, July 21\, 2022 - 2:00pm\nLocation: Virtual Via Zoom: https:// uwaterloo.zoom.us/j/96276466460?pwd=Y21OaFJhM3BpWWMwQkY3QWYrMDFZZz09\n\ nThe quantum marginals problem (QMP) aims to understand how the various mar ginals of a joint quantum state are related to one another by deciding whet her or not a given collection of marginals is compatible with some joint qu antum state. Although existing techniques for the QMP are well developed fo r the special case of disjoint marginals\, the same is not true for the gen eric case of overlapping marginals. The leading technique for the generic Q MP\, published by Yu et. al. (2021)\, resorts to evaluating a hierarchy of semidefinite programs.\n\nIn this talk\, I will introduce a slightly differ ent approach to the QMP by demonstrating how to construct a simple hierarch y of operator inequality constraints each of which are necessarily satisfie d by any collection of marginals of a joint quantum state. Then\, using sta te-estimation techniques and large deviation theory\, I will sketch the pro of that the satisfaction of these inequalities is additionally sufficient f or a collection of marginals to be compatible with some joint quantum state . LAST-MODIFIED:20220715T170953Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/96276466460?pwd=Y21O aFJhM3BpWWMwQkY3QWYrMDFZZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: TC Fraser TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220718T150000Z DTEND:20220718T160000Z DTSTAMP:20220808T214455Z UID:69nmbvroh8v42fifsc1fb13dto@google.com CREATED:20220715T165125Z DESCRIPTION:Title: Improved Characterization and Provably Optimal Control of Temporally Correlated Control Noise\nSpeakers: Robert Barr and Colin Tro ut (Johns Hopkins University Applied Physics Laboratory)\nTime: Monday\, Ju ly 18\, 2022 - 11:00am\nLocation: ATL 3100A and Virtual Via Zoom: https://umd .zoom.us/j/95071159938?pwd=NWpXTDdoNisyckNGbnROc3JZcTlqQT09 Meeting ID: 950 7115 9938 Passcode: 681204\n\nThe ability to perform fast and robust o perations on multi-qubit quantum systems is a necessity for realizing relia ble quantum computation. Unfortunately\, the inevitable interaction between a quantum system and its environment presents an obstacle for achieving su ch operations. Despite this challenge\, when used in tandem\, quantum noise characterization and quantum control provide a means for engineering targe ted control protocols that achieve noise-robust quantum logic operations in formed by knowledge of the underlying noise properties. In this talk\, we s pecifically focus on the characterization and mitigation of temporally corr elated control noise. First\, we present recent results on characterizing t emporally correlated control noise in the presence of strong dephasing and detuning noise. Through the use of filter design methods\, we will show tha t one can design control waveforms that combine attributes of noise charact erization sequences with attributes of noise suppression sequences. Second\ , we demonstrate an approach for engineering quantum control that optimally mitigates temporally-correlated control noise. Our approach takes the cha racterization of the control noise as input and utilizes model-based descri ptions of the noisy dynamics to frame the search for control solutions as a convex gate-based circuit optimization. When used in concert\, the present ed characterization and control protocols enable improved estimation of con trol noise power spectra and efficient design of noise-tailored provably op timal control.\n\nRobert Barr: 11:00 a.m. to 11:30 a.m\n\nColin Trout: 11 :30 a.m. to 12:00 p.m.\n\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/9507115993 8?pwd=NWpXTDdoNisyckNGbnROc3JZcTlqQT09\n\nMeeting ID: 950 7115 9938\nPa sscode: 681204\nOne tap mobile\n+13017158592\,\,95071159938#\,\,\,\,*681204 # US (Washington DC)\n+13126266799\,\,95071159938#\,\,\,\,*681204# US (Chic ago)\n\nDial by your location\n +1 301 715 8592 US (Washington DC)\n +1 312 626 6799 US (Chicago)\n +1 646 931 3860 US\n + 1 929 436 2866 US (New York)\n +1 669 444 9171 US\n +1 669 90 0 6833 US (San Jose)\n +1 253 215 8782 US (Tacoma)\n +1 346 2 48 7799 US (Houston)\nMeeting ID: 950 7115 9938\nPasscode: 681204\nFind you r local number: https://umd.zoom.us/u/adGA 1zZcXi\n\nJoin by SIP\n95071159938@zoomcrc.com\n\nJoin by H.323\n162.255.37.11 (US We st)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114.115.7 ( India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244.140.110 ( Germany)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Australia Melb ourne)\n149.137.40.110 (Singapore)\n64.211.144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toronto)\n65.39.152.160 (Canada Vancouver) \n207.226.132.110 (Japan Tokyo)\n149.137.24.110 (Japan Osaka)\nMeeting ID: 950 7115 9938\nPasscode: 681204 LAST-MODIFIED:20220715T165125Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/95071159938? pwd=NWpXTDdoNisyckNGbnROc3JZcTlqQT09 Meeting ID: 950 7115 9938 Passcode: 68 1204 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Robert Barr and Colin Trout TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220818T180000Z DTEND:20220818T190000Z DTSTAMP:20220808T214455Z UID:07l5betbevrv3ou1ibstie62pq@google.com CREATED:20220628T025212Z DESCRIPTION:Title: To be announced\nSpeaker: Jerry Li (Microsoft Research )\nTime: Thursday\, August 18\, 2022 - 2:00pm\nLocation: Virtual Via Zoom : To be announced\n\nThe title and abstract for this talk are forthcoming. LAST-MODIFIED:20220628T025212Z LOCATION:Virtual Via Zoom: To be announced SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Jerry Li TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220706T150000Z DTEND:20220706T160000Z DTSTAMP:20220808T214455Z UID:77vfaceof477nivpo7eup8ho23@google.com CREATED:20220623T162116Z DESCRIPTION:Title:  Quantum information about unknown parameters can be compressed unboundedly without loss
Speaker:  David Arvidsson-Shukur (Hitachi/University of Cambridge)
Time:  Wednesday\, July 6\, 2022 - 11 :00am
Location:  ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/4111099146


Sev eral tasks in quantum-information processing involve quantum learning. For example\, quantum sensing\, quantum machine learning and quantum-computer c alibration involve learning and estimating unknown parameters from measurem ents of many copies of a quantum state that depends on those parameters. Th is type of metrological information is described by the quantum Fisher info rmation matrix\, which bounds the average amount of information learnt abou t the parameters per measurement of the state. In this talk\, I will show t hat the quantum Fisher information about parameters encoded in N copies of the state can be compressed into M copies of a related state\, where M <\ ;<\; N. I will show that  M/N can be made arbitrarily small\, and that th e compression can happen without loss of information. I will also demonstra te how to construct filters that perform this unbounded and lossless inform ation compression. Our results are not only theoretically important\, but a lso practically. In several technologies\, it is advantageous to compress i nformation in as few states as possible\, for example\, to avoid detector s aturation and/or to reduce post-processing costs. Our filters can reduce ar bitrarily the quantum-state intensity on experimental detectors\, while ret aining all initial information. I will discuss our recent experimental demo nstration of this. Finally\, I will prove that the ability to distil quantu m Fisher information is a non-classical advantage that stems from the negat ivity of a particular quasiprobability distribution\, a quantum extension o f a probability distribution.

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Meeting ID: 411 109 9146
LAST-MODIFIED:20220623T162117Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/4111099146 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: David Arvidsson-Shukur TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220725T173000Z DTEND:20220725T183000Z DTSTAMP:20220808T214455Z UID:7kk0qgl3647mge2o16i60rjqsh@google.com CREATED:20220622T155817Z DESCRIPTION:Speaker: Bruno Laburthe-Tolra (Université Paris Nord - Villetan euse) \nTitle: Large spin atoms in optical lattices\n\nAbstract: Our experi mental projects at the Laser Physics Institute (North Paris University) aim at characterizing entanglement for many-body systems made of large spin at oms. For this\, we developed two experimental set-ups : one with large-spin strontium fermionic atoms\, with spin-independent contact interactions\; o ne with large-spin chromium bosonic atoms\, with spin-dependent long-range dipole-dipole interactions.\n\nI will first briefly describe our first meas urements of the spin distribution of the SU(N) Fermi gas made of strontium atoms. For this\, we used a spin-orbit coupling scheme\, where a retrorefle cted laser beam selectively diffracts two spin components in opposite direc tions. Spin sensitivity is provided by sweeping through a magnetic-field se nsitive transition while dark states ensure that spontaneous emission remai ns low.\n\nOn the chromium machine\, we investigated the spin dynamics and quantum thermalization of a macroscopic ensemble of S = 3 spins initially p repared in a pure coherent spin state. The experiment uses a unit-filled ar ray of 10 thousand chromium atoms in a three dimensional optical lattice. A toms interact at long distance under the effect of magnetic dipole-dipole i nteractions\, realizing the spin-3 XXZ Heisenberg model with long-range cou plings. We investigated the build-up of quantum correlations in this many-b ody system. For this\, we measured collective properties such as the total population in the seven different Zeeman states\, or the collective spin le ngth. We also found that the measurement of magnetization fluctuations prov ides direct quantitative estimates for two-body correlations. LAST-MODIFIED:20220622T155958Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221011T160000 DTEND;TZID=America/New_York:20221011T170000 DTSTAMP:20220808T214455Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20221011T160000 CREATED:20210423T130624Z DESCRIPTION: LAST-MODIFIED:20220622T143358Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium Shih-I Pai TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20221018T160000 DTEND;TZID=America/New_York:20221018T170000 DTSTAMP:20220808T214455Z UID:1jb7vengd4amg0mpkqmt90tifq@google.com RECURRENCE-ID;TZID=America/New_York:20221018T160000 CREATED:20210423T130624Z DESCRIPTION: LAST-MODIFIED:20220622T143342Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium Paint Branch TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211129T110000 DTEND;TZID=America/New_York:20211129T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211129T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Christopher Laumann \n\nInstitition: Boston University \n\nTitle: The fine structure of quantum spin ice\n\nAbstract: Quantum spi n liquids are low temperature phases of magnetic materials in which quantum fluctuations prevent the establishment of long-range magnetic order. These phases support fractionalized spin excitations (spinons) coupled to emerge nt photons. In this talk\, I will review the basic picture of how quantum electrodynamics emerges in 3D spin ice and then turn to several results reg arding its `fine structure'. I will argue that the fine structure constant 𝜶 -- the dimensionless coupling which controls the interactions between li ght and matter -- generically takes values ~0.1 in quantum spin ice\, much larger than the 𝜶 ~ 1/137 of our universe [1]. The large fine structure co nstant modifies the spinon dynamics considerably. The consequent qualitativ e features in inelastic neutron scattering could help identify these phases [2]. Time permitting\, I will also discuss how axions can appear in the sy stem [3].\n\n[1] Pace\, Morampudi\, Moessner\, Laumann. Phys. Rev. Lett. 12 7\, 117205 (2021).\n[2] Morampudi\, Wilczek\, Laumann. Phys. Rev. Lett. 124 \, 097204 (2020).\n[3] Pace\, Castelnovo\, Laumann. arXiv:2109.06890.\n\nHo st: Jay Sau LAST-MODIFIED:20220617T080754Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211014T140000 DTEND;TZID=America/New_York:20211014T153000 DTSTAMP:20220808T214455Z UID:2n7gfg0fjrtujinjjludroip31@google.com RECURRENCE-ID;TZID=America/New_York:20211014T140000 CREATED:20210924T121251Z DESCRIPTION:Title: \;1D Structures for Topological Quantum Device s


Abstract: \;Topological states such as Majorana modes provide unique pathways to fault-tolerant quantum computi ng. Recent progress in this direction has been enabled by novel proximity e ffects between low-dimensional semiconductors and superconductors. However\ , further breakthroughs require developing a systematic understanding of th e materials systems and devices\, with a particular attention to integratin g magnetic materials with semiconductors and superconductors in 1D. In addi tion\, understanding the role of disorder is essential for achieving robust topological states. I will discuss how magnet-semiconductor nanowire hybri d devices can provide unprecedented insight into the basic effects that und erpin the realization of Majorana modes\, notably the essential\, but so fa r elusive helical state. A second key challenge is that of developing a pla tform for topological quantum computing that is not only robust at the sing le-device level\, but that simultaneously holds the potential to be scalabl e into more complex systems. To this end\, the integration of magnets with semiconductor nanowires is also uniquely promising. I will describe our eff orts to search systematically for the optimal combinations of magnetic and semiconducting low-dimensional materials\, guided by DFT calculations. Fina lly\, with regards to both robustness and scalability\, it may be useful to consider materials systems beyond semiconductor hybrid devices. I will dis cuss a conceptually new experimental approach that is semiconductor-free an d intrinsically scalable. \;

Host: Paglione

Oct 14: 2pm - 3:30pm: 1201 Toll Physics Bldg
This seminar will also be broadcast via Z OOM: \; \;https://umd.z oom.us/j/91301075848 \;
Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080752Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Vlad Pribiag\, University of Minnesota TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Oct 14_Vlad Pribiag.pptx;FMTTYPE=application /vnd.openxmlformats-officedocument.presentationml.presentation:https://driv e.google.com/file/d/1ZVsEVnVeee0086W5SROVvsPGBOIyd25-/view?usp=drive_web END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211111T140000 DTEND;TZID=America/New_York:20211111T153000 DTSTAMP:20220808T214455Z UID:60ve4r7fj59rgcs9pjjsum2rsh@google.com RECURRENCE-ID;TZID=America/New_York:20211111T140000 CREATED:20210924T122442Z DESCRIPTION:Speaker: Peter Hirschfeld\, University of Florida


Title: Renaissance in the Ruthenates: some Ruminations on a Res olution

Recent nuclear magnetic resonance studies [A. Pustogow et al .\,

Nature 574\, 72 (2019)\; Chronister\, arXiv:2007.13730]have chal lenged the prevalent chiral triplet pairing scenario proposed for the canon ical unconventional superconductorSr$_2$RuO$_4$. I present a detailed theor etical study of spin-fluctuation mediated pairing for this compound\, mapp ing out the phase diagram as a function of spin-orbit coupling\, interactio n parameters\, and band-structure properties over physically reasonable ran ges\, comparing when possible with photoemission and inelastic neutron scat tering data information. Even-parity pseudospin singlet solutions are found to dominate large regions of the phase diagram\, leading to suggestions th at accidentally degenerate representations may explain the data. In particu lar\, we propose that an accidentally degenerate combination of extended s and d_xypairingmay explain experiments consistently\, if the microscopic no dal structure of such states is accounted for. If time permits\, I'll discu ss the prospects of direct measurements of the superconducting gap by STM. Interpreting such experiments requires acknowledge of the reconstructed su rface band structure.


Host: Paglione

Location: Toll Physi cs Rm 1201
Seminar also on Zoom: \; \;https://umd.zoom.us/j/91301075848

Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080748Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Peter Hirschfeld\, University of Florida TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211108T160000 DTEND;TZID=America/New_York:20211108T173000 DTSTAMP:20220808T214455Z UID:45gl7f716mpccpshg4k9q8rd8r@google.com RECURRENCE-ID;TZID=America/New_York:20211108T160000 CREATED:20210924T113938Z DESCRIPTION:Speaker: Yizhou Huang


Title: Title: \; Decreased Transmon T1 and Increased Pe f rom High Resonator Drive Power

Abstract: We discuss detrimental effe cts on the lifetime T1 and initial excited state population (Pe) of a 6 GHz Al/AlOx/Al transmon when pumping the read-out resonator at large powers. I n our device\, the qubit is coupled to an 8 GHz Al resonator that is in tur n coupled to an input-output transmission line for measuring the resonator. Using a low power dispersive readout\, we find T1 ~ 30us and Pe ~ 0.16%. O n the other hand\, when pumping the resonator at high powers\, slightly abo ve the Jaynes-Cummings nonlinear readout point[1]\, T1 decreases to 2 us an d the excited state population increases more than an order of magnitude to Pe ~ 10%. After a high power pulse\, T1 recovers on a time scale that is c onsistent with quasiparticle tunneling through the junction being the domin ant loss mechanism[2]\, which is further supported by studying voltage acro ss the transmon junction. On the other hand\, as we will discuss in a quali tative way\, Pe has a non-trivial dependence on the detuning of the drive f rom the qubit transition frequency.[1]Reed et al.\, Phys. Rev. Lett. 105\, 173601 (2010).
[2]Wang et al.\, Nat. Commun. 5\, 5836 (2014)

&nbs p\;
Advisor: Benjamin Palmer


PLEASE NOTE: TODAY"S SEMINAR I S VIRTUAL ON ZOOM: \;https://umd.zoom.us/j/97540478019 LAST-MODIFIED:20220617T080746Z LOCATION:Virtual on ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Yizhou Huang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210927T110000 DTEND;TZID=America/New_York:20210927T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20210927T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Jainendra Jain\, Pennsylvania State University\n\nTitl e: The magic of emergent topological particles\nAbstract: The fractional qu antum Hall system is one of the most strongly correlated systems in the wor ld\, because its physics is fully dictated by the interaction between the e lectrons\, with their kinetic energy having been fully suppressed by the ma gnetic field. Somewhat surprisingly\, much of the vast phenomenology of the fractional quantum Hall effect is now understood not only qualitatively bu t with a microscopic precision that rivals\, ideally\, that of atomic physi cs. This has become possible thanks to the emergence of the topological par ticle called composite fermion. After a brief review of various states and phenomena of composite fermions meant for the non-specialists\, this talk w ill focus on recent developments connected to experiments. It will also int roduce a model interaction that can be solved for all eigenstates at arbitr ary filling factors\, and produces fractional quantum Hall effect. \n\nHost : Alicia Kollar LAST-MODIFIED:20220617T080738Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211209T140000 DTEND;TZID=America/New_York:20211209T153000 DTSTAMP:20220808T214455Z UID:7r5kf6la3hq1lh7ri1rv4paqij@google.com RECURRENCE-ID;TZID=America/New_York:20211209T140000 CREATED:20210924T122743Z DESCRIPTION:Title: Strongly correlated Weyl semimetal in Kondo lattice syst em

Abstract: Band structure topology and strong electronic correlati ons are essential components for a plethora of emergent phenomena in novel quantum materials\, although their intersection has not been extensively st udied. Kondo systems provide a promising platform to investigate strongly c orrelated topological phases. Following the recent theoretical prediction t hat Kondo hybridization incorporated with crystalline symmetry could lead t o topological gapless states\, we investigated two Kondo lattice systems\, one with inversion symmetry broking\, one with nonsymmorphic crystal symmet ry. In both cases\, we observed anomalous Hall effect originating from nont rivial Berry curvature associated with Weyl nodes in the vicinity of Fermi level.


Host: Butch
 \;
Location: Toll Physics Rm 1201< br>
Seminar also on Zoom
Meeting LAST-MODIFIED:20220617T080737Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Sheng Ran\, Washington U-St. Louis TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210930T140000 DTEND;TZID=America/New_York:20210930T153000 DTSTAMP:20220808T214455Z UID:61pomjs6tmmolr68r2ctdphsbl@google.com RECURRENCE-ID;TZID=America/New_York:20210930T140000 CREATED:20210924T120935Z DESCRIPTION:

David Hsieh

California Institute of Techn ology

"Strongly Driven Quantum Materials "

Driving strongly correlated electron s ystems far from equilibrium can lead to fundamentally new many-body phenome na that are thermally inaccessible. In this talk\, I will describe a series of recent experiments that leverage advanced ultrafast optical spectroscop ic techniques to uncover transient properties of Mott insulators driven by intense electromagnetic fields. By tailoring the characteristics of the ele ctromagnetic field\, I will show how different out-of-equilibrium phenomena can be selectively realized. In particular\, I will highlight the control of magnetic order using resonant driving\, the nonlinear production of elec tron-hole pairs via off-resonant driving\, and coherent “Floquet” engineeri ng of electronic band structures and optical properties via far off-resonan t driving. \;  \;


Host: PAGLIONE

This seminar will be broadcast via ZOOM:
https://umd.zoom.us/s/91301075848 LAST-MODIFIED:20220617T080724Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM (zoom): David Hsieh\, Caltech TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Sep 30_David Hsieh.pdf;FMTTYPE=application/p df:https://drive.google.com/file/d/1dHsv1bJ3HZ7fppzMvgL9nf-2pDlI285G/view?u sp=drive_web END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211018T160000 DTEND;TZID=America/New_York:20211018T173000 DTSTAMP:20220808T214455Z UID:6cac7bc7fc6lnjtierpbjsgtn5@google.com RECURRENCE-ID;TZID=America/New_York:20211018T160000 CREATED:20210924T113733Z DESCRIPTION:Speaker: Jingnan Cai
< /tr>


Title: \;Effect of Coupling on Hysteretic rf SQ UID Metamaterials

Abstract: \;Radio frequency Superconducting Qu antum Interference Device (rf SQUID) has been established as a viable build ing block for microwave frequency metamaterials [1\,2]. The single rf SQUID resonance frequency is tunable under applied dc flux\, with a period of on e flux quantum and the upper-frequency range scaling as1+rf. The previous e xperimental works restricted the parameter rf below unity to avoid hysteres is\, and limited the coupling strength among SQUIDs to small and negative v alues\, which resulted in single-SQUID like behaviors. In this work\, we ha ve built new arrays of rf SQUID meta-atoms in the hysteretic regime (rf > \;1) with strong negative and positive couplings. We experimentally observe d period doublings in the dc flux tunability\, and band gap formations\, bo th of which emerged from collective behaviors of a strongly interacting and highly nonlinear system. These nontrivial behaviors demonstrated the poten tial for the rf SQUID metamaterial as a platform to study many-body physics .

 \;
Advisor: \; Steve Anlage \;
Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080713Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Jingnan Cai TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211115T110000 DTEND;TZID=America/New_York:20211115T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211115T110000 CREATED:20210708T004621Z DESCRIPTION: \nSpeaker: Aashish Clerk\n \n Institution: Univ ersity of Chicago\n\nDriven-dissipative quantum systems and hidden time-rev ersal symmetries \n \nQuantum systems subject to both driving and dissipati on often have complex\, non-thermal steady states\, and are at the forefron t of research in many areas of physics\, including quantum information proc essing. For classical systems\, microscopic time-reversal symmetry leads t o open systems satisfying detailed balance\; this symmetry makes it extreme ly easy to find their stationary states. In this talk\, I’ll discuss a new way to think about detailed balance in fully quantum settings based on the existence of a “hidden” time-reversal symmetry. I’ll show how this symmet ry connects to the study of thermofield double states\, and moreover\, has a direct operational utility: it provides a direct way to find exact solut ions of non-trivial states. This symmetry is present in a number of experi mentally-relevant systems. and has clear experimental signatures. I’ll try to give a gentle introduction to these ideas\, with a particular focus on many-body driven-dissipative Bose Hubbard like models (as can be realized d irectly in superconducting circuits and a variety of quantum optical platfo rms). \n\nHost: Alicia Kollar LAST-MODIFIED:20220617T080709Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211004T110000 DTEND;TZID=America/New_York:20211004T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211004T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Marianna Safronova\, University of Delaware

Tit le: \;

Novel Clocks for New Physics Searches

Abstract: The devel opment of atomic clocks with systematic uncertainties in the 10-18 range en ables searches for the variation of fundamental constants\, dark matter\, a nd violations of Lorentz invariance. I will give an overview of dark matter searches and other fundamental physics studies with atomic and nuclear clo cks and focus on development of clocks with the highest sensitivities to ne w physics. I will discuss recent advances in theory of novel clocks based o n highly-charged ions and efforts to develop a nuclear clock. Related recen t methodology developments and resulting capabilities of the state-of-the-a rt atomic methods to compute atomic properties of complicated atomic specie s will be presented. I will also report a release of the first version of a new online portal for high-precision atomic data and computation. Future p lans to add data for more systems as well as to release computer codes are discussed.

Host: Charles Clark \; LAST-MODIFIED:20220617T080654Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211021T140000 DTEND;TZID=America/New_York:20211021T153000 DTSTAMP:20220808T214455Z UID:7mcnlahfqn2ic1ebheevnj7gs9@google.com RECURRENCE-ID;TZID=America/New_York:20211021T140000 CREATED:20210924T121413Z DESCRIPTION: LAST-MODIFIED:20220617T080651Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: No QMC Seminar\, Thu\, Oct. 21 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211129T150000 DTEND;TZID=America/New_York:20211129T163000 DTSTAMP:20220808T214455Z UID:585k1d3fbanr7t31kj3oqqkcr9@google.com RECURRENCE-ID;TZID=America/New_York:20211129T150000 CREATED:20210908T132458Z DESCRIPTION:Seminar will be conducted via zoom.

Speaker: Patrick Dra per\, UIUC

Title: The CKN Bound and Particle Physics

Abstract : The holographic principle implies that quantum field theory overcounts th e number of independent degrees of freedom in quantum gravity. An argument due to Cohen\, Kaplan\, and Nelson (CKN) suggests that the number of degree s of freedom well-described by QFT is even smaller than required by hologra phic bounds\, and CKN interpreted this result as indicative of a correlatio n between the UV and IR cutoffs on QFT. We consider an alternative interpre tation in which the QFT degrees of freedom are depleted as a function of sc ale\, and we use a simple recipe to estimate the impact of depleted densiti es of states on precision observables. Although these observables are not s ensitive to the level of depletion motivated by gravitational consideration s\, the phenomenological exercises also provide an interesting test of QFT that is independent of underlying quantum gravity assumptions. A depleted d ensity of states can also render the QFT vacuum energy UV-insensitive\, rec onciling the success of QFT in describing ordinary particle physics process es and its apparent failure in predicting the cosmological constant.

For zoom link please email mknouse@umd.ed u LAST-MODIFIED:20220617T080649Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211108T110000 DTEND;TZID=America/New_York:20211108T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211108T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Kanu Sinha\, \;Princeton University

Title: \;Engineering Atom-Field interactions in Nanoscale Quantum Op tical Systems \;
Abstract: \;

Interactions between atom s and electromagnetic fields are at the core of nearly all quantum devices\ , with applications ranging from building quantum computers and networks\, communicating quantum information over long distances\, and developing quan tum sensors of increasing precision. The miniaturization of these systems i s critical to increasing their modularity as well as improving the efficacy of light-matter interactions by confining electromagnetic fields in small volumes. Thus atom-field interactions at nanoscales become a pivotal aspect of understanding and designing novel photonic devices. \;

In this t alk\, I will discuss two specific challenges relevant to nanoscale quantum optical sys tems and ways to engineer them: (1) Fluctuation phenomena – For ces\, dissipation and deco herence induced by fluctuations of the electroma gnetic field limit the control and coherence of quantum systems at nanoscal es. I will present an overview of ways to engineer fluctuation phe nomena i n nanophotonic systems\, and discuss specifically how collective effects ca n be used to tailor fluctuation-induced forces between atoms and surfaces. (2) Collective atom-field interactions over long distances – Distant correl ated atoms coupled via waveguides can exhibit surprisingly rich non-Markovi an dynamics arising from the memory effects of their intermediary electroma g netic environment. I will discuss how such a system demonstrates collecti ve spontaneous emission rates exceeding those of Dicke superradiance (‘supe rduperradiance’)\, formation of macroscopically delocalized atom-photon bou nd states and limitations on long-distance quantum information proto cols. These ideas pave way for building novel efficient light-matter interfaces a nd scalable quantum devices with long distance correlated quantum systems.< /b>

Host: Charles Clark LAST-MODIFIED:20220617T080648Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211122T110000 DTEND;TZID=America/New_York:20211122T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211122T110000 CREATED:20210708T004621Z DESCRIPTION:All-optical coherent control of solid-state spin qubits toward quantum photonic applications

Speaker: Demitry Farfurnik
Institution: UMD

Abstract: Optically-active spins in the solid-stat e are useful resources for quantum technologies. The coupling of such syste ms to photonic structures can generate deterministic spin-photon entangleme nt\, which could contribute to quantum simulations and networking. Ideal sp in systems for such applications must combine high quality spin and photoni c properties\, as well as efficient methods for the coherent manipulation o f the spin state. While common methods for controlling the quantum state of spin qubits utilize microwave fields\, such methods become challenging in many optically-active spin systems that exhibit low g-factors. In this talk \, I will introduce an alternative method\, based on a two-photon Raman exc itation\, for coherently manipulating spins in systems for which microwave control is challenging. I will present our all-optical approach for perform ing noise spectroscopy of solid-state spins\, which leverages such Raman-ba sed control to implement pulse sequences inspired by nuclear magnetic reson ance. Such realization of noise spectroscopy allowed us to directly probe t he high frequency (up to 100 MHz) noise spectra of single electrons confine d in an InAs/GaAs quantum dots\, in agreement with theoretical models that consider the hyperfine interaction of such electrons with an ensemble of nu clear spins broadened by strain. After discussing the noise spectra of InAs /GaAs quantum dots\, I will introduce additional systems with promising spi n and optical properties that we plan to study using similar noise spectros copy approaches. Finally\, I will present our research directions on the co upling of spins to fabricated photonic structures. Combining such coupling with all-optical coherent control could enable the realization of novel pul se sequences for high resolution sensing\, quantum information processing a nd quantum networking.


Trajectory entanglement and samplin g complexity of jump outcomes induced by monitoring dissipative processes


Speaker: Mathias Van Regemortel

Institition: UMD

Abstract: \;Studying the effect of local projective measurements on the scaling of entanglement entropy is an intense topic of research in the context of meas urement-induced phase transitions. While it is traditionally studied in dis crete circuit models\, a close continuous-time analogy can be drawn with mo nitored open quantum dynamics\, where a record of the registered quantum-ju mp clicks allows one to reconstruct the pure-state stochastic trajectories. I will first show how monitoring a cavity array with two competing protoco ls\, one generating coherence and the other performing a weak number measur ement\, induces an entanglement scaling transition for the trajectory state s across a critical point. While for this problem the associated master equ ation of the open system is not invariant\, I will illustrate next that sol ely changing the monitoring protocol of the same dissipative processes can also have an impact on the stochastic trajectory dynamics. In this setup\, the quantum jumps of spontaneous emission are monitored after passing throu gh a linear interferometer\, affecting both the scaling of trajectory entan glement entropy and the hardness of sampling the click outcomes. We show&nb sp\;that this problem is equivalent to the famous problem of Fock-state bos on sampling. \; LAST-MODIFIED:20220617T080647Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211025T110000 DTEND;TZID=America/New_York:20211025T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211025T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Charlie Kane\, University of Pennsylvania\n\nTitle: Qu antized Nonlinear Response in Ballistic Metals\n\nAbstract: A dramatic cons equence of the role of topology in the structure of quantum matter is the e xistence of topological invariants that are reflected in quantized response functions. In this talk we will discuss a new variant on this theme. We i ntroduce a non-linear frequency dependent D+1 terminal conductance that cha racterizes a D dimensional Fermi gas\, generalizing the Landauer conductanc e in D = 1. For a ballistic conductor we show that this conductance is quan tized and probes the Euler characteristic of the Fermi sea. We critically address the roles of electrical contacts and of Fermi liquid interactions\ , and we propose experiments on 2D Dirac materials such as graphene using a triple point contact geometry.\n\nHost: Charles Clark LAST-MODIFIED:20220617T080644Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211118T140000 DTEND;TZID=America/New_York:20211118T153000 DTSTAMP:20220808T214455Z UID:7e32v5dj8kg84fh3s0aoksijf1@google.com RECURRENCE-ID;TZID=America/New_York:20211118T140000 CREATED:20210924T122545Z DESCRIPTION:

Title:

Materials discovery of next-gene ration quantum materials\, the AV3Sb5 \;(A: K\, R b\, Cs) kagome superconductors

Abstract:

New materials d iscovery has been a fundamental part of the synthetic chemistry\, condensed matter physics\, and materials fields. The targeted synthesis of new terna ry and quaternary compounds has immense potential for introducing new chemi cal complexity and diversity into the known model systems. Our discovery of the AV3Sb5 \;(A: K\, Rb\, Cs) kagome superconduc tors is a prime example of how rational exploration of phase space can lead to untold opportunity. The AV3Sb5 \;materials ar e quasi-2D (structurally and electronically)\, exfoliatable\, air-stable\, metals with a structurally perfect kagome network of vanadium. The entire f amily exhibits competition between charge density wave (CDW) order below (8 0-100K)\, and a superconducting (Tc = 0.9-2.5K) ground state. Our work indi cates that the systems are topologically nontrivial\, and surface states sh ould be close to the natural Fermi level. A complex interplay between the e lectronic properties and the CDW is observed\, with the possibility of a ch iral CDW as the source of anomalous Hall effect in the entire family. In th is seminar I will describe the rapidly growing body of knowledge surroundin g the AV3Sb5 \;system\, including potential topol ogical surface states\, unconventional superconductivity\, and interplay of charge density wave order and superconductivity.


Host: Paglione

VIRTUAL ZOOM SEMINAR: \; \;https://umd.zoom.us/j/91301075848 LAST-MODIFIED:20220617T080640Z LOCATION:Virtual: https://umd.zoom.us/j/91301075848 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Brenden Ortiz\, UC Santa Barbara TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210830T110000 DTEND;TZID=America/New_York:20210830T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20210830T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Pedram Roushan\, Google LLC

Title: Experiments on superconducting processors at the dawn of NISQ era

Abstract: The recent successful computation beyond the capability of classical computers has brought considerable attention to the Noisy Intermediate Scale Quantum (NISQ) processors. The \;only \;way to evaluate the promise of NISQ devices is to implement algorithms on them that are of interest to the scientific community. In this talk\, I will present two of such exampl es based on our recent works on \;time crystals \;and the \;Kitaev toric code \;[1\,2]. \; The first work is on study phase transitions\, which is challenge due to limited programmabilit y\, finite coherence time\, and finite size of NISQ hardware. With addressi ng these issues\, we provide a set of experimental benchmarks and establish a scalable approach to study phases of matter on current quantum processor s. \; \;The theme of the second work is in studying topological sta tes. The discovery of topological order has revolutionized the understandin g of quantum matter in modern physics and provided the theoretical foundati on for many quantum error correcting codes. Realizing topologically ordered states has proven to be extremely challenging in both condensed matter and synthetic quantum systems. Here\, we prepare the ground state of the toric code Hamiltonian using an efficient quantum circuit. Our results demonstra te the potential of NISQ processors to provide key insights into topologica l quantum matter and quantum error correction.

[1] \;https://arxiv.org/abs/2107.13571

[2] \;https://arxiv.org/abs/2104.01180


Host: Maissam Bark eshli/ Alicia Kollar LAST-MODIFIED:20220617T080639Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211028T140000 DTEND;TZID=America/New_York:20211028T153000 DTSTAMP:20220808T214455Z UID:0v6nmv83sdjqu7f84eiegc9pai@google.com RECURRENCE-ID;TZID=America/New_York:20211028T140000 CREATED:20210924T121945Z DESCRIPTION:Title: \; \;Discrete quantum geometry and topology i n solid-state materials

Abstract: \;The topological classifi cation of continuous manifolds in real space and reciprocal space has been extensively discussed for solid-state materials. This has led to the discov eries of many intriguing materials hosting non-trivial topological orders s uch as helical domains\, magnetic skyrmions\, Chern insulators\, Z2 insulat ors and Weyl semimetals. However\, the discrete topology and geometry in th ese scenarios have attracted much less attention. Here I will introduce our efforts in practicing the discrete geometry and topology in solid-state ph ysics\, which not only refreshes our conventional understandings\, but also resolves many difficulties encountered by their continuous counterparts. I n particular I will discuss (i) the topological transition of spin textures defined on a discrete lattice [1]\, and (ii) a new perspective to understa nd the intrinsic spin-Hall effect as a property of the discrete quantum man ifold of the Fermi surface [2].

 \;[1] \;Gen Yin\, Yufan Li\, Lin gyao Kong\, Roger K. Lake\, C. L. Chien\, and Jiadong Zang \;Phys. Rev. B \;93\, 174403

[2] Jie-Xiang Yu\, Jiadong Zang\, Roger K Lake\, Yi Zhang\, and Gen Yin\, arXiv:2106.09073




Host: Takeuchi


Location: Rm 1201\, Toll Physics Bldg
This seminar will also be broadcast via ZOOM: \;http s://umd.zoom.us/j/91301075848 \;

Note: there will NOT be rec eptions prior to the talk until further notice. LAST-MODIFIED:20220617T080632Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Gen Yin\, Georgetown University TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Oct 28_Gen Yin.pdf;FMTTYPE=application/pdf:h ttps://drive.google.com/file/d/197U09QjlKCWSe0M1nygPo7WvVbVb6CAv/view?usp=d rive_web END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211129T160000 DTEND;TZID=America/New_York:20211129T173000 DTSTAMP:20220808T214455Z UID:6bit2fdbcs40kg03b06pfsulvd@google.com RECURRENCE-ID;TZID=America/New_York:20211129T160000 CREATED:20210924T114100Z DESCRIPTION:Speaker1 : Jarryd Allyn Horn
Advisor: Johnpierre Paglione

Title: Superconducting and normal state properties of Ni-Bi bin ary system

Abstract: \;Superconductivity in the bismuth-n ickel system has been of interest due to both the discovery of triplet p-wa ve superconductivity in bilayer films and the possible competition between superconductivity and magnetic order that has been measured in single-cryst al NiBi3. While previous literature suggests that the presence of amorphous nickel may be the source of the previously reported ferromagnetic order in NiBi3\, the effect of bismuth impurities on the electronic properties are rarely addressed. Understanding the role of these extrinsic effects calls f or a more careful investigation of the electronic properties of NiBi3. In o rder to address this\, we have grown NiBi3 samples by bismuth flux (as have all previously reported NiBi3 single crystal samples) as well as by chemic al vapor transport (CVT). In this talk\, I present magneto transport studie s of flux- and CVT-grown NiBi3 samples which reveal large discrepancies in the electronic properties both between samples and between different sectio ns of the same sample that suggest that bismuth impurities play a significa nt role in the normal state and superconducting properties of NiBi3. In add ition\,  \;will also report on recent measurements of the superconducti ng and normal state properties of NiBi grown by Bismuth flux.



Speaker 2: Aaron Somoroff
Advisor: Vladimir Manucharyan

Tit le: Quantum Computing with Fluxonium

Abstract: Among the main obstac les in realizing a quantum processor based on superconducting circuits are increasing quantum coherence times and the anharmonicity of the spectrum. I report our group's progress in improving coherence and control of fluxoniu m superconducting circuits with optimization of the circuit's spectrum and enhancements in fabrication. I demonstrate a device with coherence time T2 exceeding 1 millisecond and an average single qubit gate fidelity greater t han 99.99% [1]. This coherence time is still limited by dielectric loss and can be improved by further mitigating material losses. The high gate fidel ity is readily achievable due to the high anharmonicity inherent to fluxoni um. Finally\, I will present our recent work on scaling up from the single- qubit level to demonstrating two-qubit gates with capacitively coupled flux onium circuits [2].


[1] A. Somoroff et al. arXiv:2103.08578 (202 1)
[2] Q. Ficheux et al. Phys. Rev. X 11\, 021026 (2021)

Note: th ere will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080626Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Jarryd Allyn Horn/Aaron Somoroff TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211018T110000 DTEND;TZID=America/New_York:20211018T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211018T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Sofia Economou\, Virginia Polytechnic and State Univer sity

Title: \;Generation of photonic graph states from spin-p hoton interfaces
Abstract: Photonic graph (or cluster) states are of interest for applications in one-way quantum computing and in quantum netw orks. The lack of photon-photon interactions makes the generation of entang led photonic states challenging: it is either based on resource-intensive p robabilistic processes using linear optics\, or it requires nonlinear inter actions through a matter system. Here we will consider the direct generatio n of photonic entangled graph states from controlled quantum emitters. I wi ll discuss the protocols developed in my group for the generation of states for quantum computing and quantum networks\, along with a general procedur e to generate any photonic graph state using minimal resources.

Host : Alicia Kollar LAST-MODIFIED:20220617T080625Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211007T140000 DTEND;TZID=America/New_York:20211007T153000 DTSTAMP:20220808T214455Z UID:4a4f7v7a715rs49hagpiqabcmc@google.com RECURRENCE-ID;TZID=America/New_York:20211007T140000 CREATED:20210924T121100Z DESCRIPTION:Title: \; Searching for flat bands in kagome lattice metals
 \;
Abstract: \;

The two-dimensionalkagome lattice model— aside from playing a central part in the context ofmagnetic frustration—has long provided a fruitful theoretical ground for the studyof topological an d correlated electronic phases\, thanks to its peculiar bandfeatures includ ing Dirac fermions and a dispersionless flat band. In recentyears\, a growi ng family of transition element-based intermetallic compoundstermed “kagome metals” are experimentally identified to realize these characteristickagom e band features. Here I will introduce our efforts to search for flatbands in the vicinity of the Fermi level in kagome metals based particularly onla te 3d transition elements (Fe\, Co\, Ni) [1-3]. I will discuss the implicat ionof these flat bands on magnetism and highlight the essential role of d-o rbitaldegrees of freedom therein—insights from which we anticipate to be ap plicableto designing flat bands in broader classes of crystalline materials .

[1]M. Kang\, LY et al.\, Dirac fermions and flat bands in the ideal kagome metalFeSn\, Nat. Mater. 19\, 163-169 (2019).

[2]M. Kang et al .\, Topological flat bands in the frustrated kagome lattice CoSn\,Nat. Comm un. 11\, 4004 (2020).

[3]LY et al.\, A flat band-induced correlated k agome metal\, arXiv/2106.10824



Host: Paglione

Seminar wil lalsobroadcast viaZOOM
ht tps://umd.zoom.us/j/ 91301075848
 \;
Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080623Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Linda Ye\, Stanford University TRANSP:OPAQUE ATTACH;FILENAME=QMC Colloquium_Oct 7_Linad Ye.pdf;FMTTYPE=application/pdf:h ttps://drive.google.com/file/d/1MFNbnxdanqQ8B32lj41_RbEWnB3a_UUr/view?usp=d rive_web END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211122T160000 DTEND;TZID=America/New_York:20211122T173000 DTSTAMP:20220808T214455Z UID:jkjo24susmror8foduuc6t6h2e@google.com RECURRENCE-ID;TZID=America/New_York:20211122T160000 CREATED:20210924T114034Z DESCRIPTION:Speaker: Heshan Yu


Title: \;Combinatorial exploration of new phase-change memory materials with enhanced properties< br>
Abstract: \;As one of the most promising candidates for d eveloping neuromorphic architectures for non-von Neumann computing and info rmation storage\, phase-change memory materials in both photonic and electr onic devices show non-volatile\, fast\, and multi-level switching between t he amorphous and meta-stable states. With the assistance of machine learnin g methodology\, in particular\, a closed-loop autonomous system and a clust ering method\, we systematically perform combinatorial exploration on a bro ad composition range of M-Sb-Te ternary systems\, where M is Ge or a transi tion metal. \;The composition spreads are fabricated by the co-sputteri ng method\, and their composition ranges are measured by wavelength dispers ive spectroscopy across the Si spread wafers. To identify optimized composi tions out of these spreads\, X-ray diffraction measurements (synchrotron ra diation)\, Raman spectroscopy\, resistance\, and optical mapping are carrie d out in order to determine the evolution of structure and other properties . Among these spreads\, few new phase-change memory materials are discovere d. Compared with widely used GST225\, these materials show higher phase-cha nge temperature and lower melting point. After fabricating the nano-size de vices\, both photonic and electrical devices fabricated using these nanocom posite phase-change memory materials show clear multi-level symmetric switc hing with low resistance drift and low quenching energy. These results sugg est that these compositions \;can be promising for neuromorphic devices .

Advisor: Takeuchi

Location: \; 1201 Toll Physics
Als o on ZOOM: \; \;https:/ /umd.zoom.us/j/97540478019 LAST-MODIFIED:20220617T080622Z LOCATION:Toll Physics Rm 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Heshan Yu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210920T110000 DTEND;TZID=America/New_York:20210920T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20210920T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Susanne Yelin\, Harvard University \n\nTitle: Quantum Optics and Applications with Cooperative 2D Arrays\nAbstract: The physics o f cooperative atoms/radiators in regular 2D arrays is dominated by two prop erties: first\, a strongly frequency-selective reflectivity and second\, th e ability to confine polariton modes cleanly on the surface. This makes suc h a system highly sensitive to and controllable by light fields. Applicatio ns of these systems include quantum information\, metrology\, and nonlinear single-photon techniques.\n\nHost: Alicia Kollar LAST-MODIFIED:20220617T080617Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211025T160000 DTEND;TZID=America/New_York:20211025T173000 DTSTAMP:20220808T214455Z UID:1n38i0k8ncufh23gk9pqo6153u@google.com RECURRENCE-ID;TZID=America/New_York:20211025T160000 CREATED:20210924T113813Z DESCRIPTION:Speaker: \; Julia Catherine Sell \;
Advisor: \; Mohammad Hafezi

Title: \;Magneto-Optical Measurements of Charged a nd Neutral Excited-States in Monolayer WSe2

Abstract: Monolayer semi conductor transition metal dichalcogenides (TMDs) have attracted significan t attention in the last decade due to their unique optical properties. Simi lar to graphene\, but with a threelayer (staggered) honeycomb lattice\, TMD s host direct-gap transitions at their ±K valleys that exhibit circular-dic hroism due to their finite Berry curvature. The reduced dimensionality of m aterials in this system\, coupled with techniques like hexagonal boron nitr ide (hBN) encapsulation\, lead to enhanced Coulomb interaction and extremel y tightly bound excitons EB ≈300-500meV. This results in a semiconductor pl atform where many quasiparticle states\, including multi-particle states li ke trions\, biexcitons (both neutral and charged)\, and most recently excit on-polarons can all coexist with distinct energetic signatures. The extreme ly tight binding also allows observation of excited versions of these parti cles\, as part of the Rydberg series in TMDs. Because of the large number o f quasiparticle species that can be observed simultaneously\, the magnetic field dependence of these states has become an important tool in understand ing and reliably identifying each species. However\, over time there have b een a significant number of reports in the literature that observe magnetic behavior that diverges from the single-particle model. These reports have led to an emerging many-body interpretation that can reconcile the broad ra nge of results. In our work\, we aim to further contribute to the understan ding of this interaction in an excited regime. Using photoluminescence exci tation (PLE)\, we confirm the existence of a charged Rydberg state in WSe2. Further\, we study the response of this state with magnetic field for the first time. These measurements shine light on the nature of excited states and show that many-body interaction observed in the ground state remains a valid interpretation in the excited regime as well.

Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080609Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Julia Sell TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211206T110000 DTEND;TZID=America/New_York:20211206T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211206T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Stephan Schlamminger\, NIST \n\nTitle: Mechanical meas urements of small forces\n\nAbstract: The absolute and precise measurement of small forces and torques is a difficult task. I will give examples of sm all forces from several research topics\, for example\, measuring the gravi tational constant\, photon pressure forces\, and new ways to calibrate torq ue screwdrivers. Several techniques\, their strengths\, but also their pitf alls will be illuminated. Thus\, the audience will learn several valuable a nd fun metrological tools and gain an appreciation of the usefulness of the se measurements to advance physics and society.\n\nHost: Eite Tiesinga LAST-MODIFIED:20220617T080608Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210503T160000 DTEND;TZID=America/New_York:20210503T170000 DTSTAMP:20220808T214455Z UID:6he7qnpm9dt692jcfcufhg48m3@google.com RECURRENCE-ID;TZID=America/New_York:20210503T160000 CREATED:20210423T163414Z DESCRIPTION:Speaker: Paolo Creminelli\, ICTP

Title: Inflation: pert urbation theory and beyond.

Abstract. Inflationary perturbations are approximately Gaussian and deviations from Gaussianity are the subject of an intense theoretical and experimental study.
Deviations from Gaussiani ty are usually calculated using perturbation theory. This method\, however\ , fails for unlikely events on the tail of the probability distribution\, l ike the formation of a primordial black hole. I will explain how one can ex plore these unlikely tails using semiclassical methods.

For zoom lin k please email: mknouse@umd.edu LAST-MODIFIED:20220617T080557Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211101T160000 DTEND;TZID=America/New_York:20211101T173000 DTSTAMP:20220808T214455Z UID:2b9gplqqt322g9adblrqfbj9lb@google.com RECURRENCE-ID;TZID=America/New_York:20211101T160000 CREATED:20210924T113854Z DESCRIPTION:Drew Baden\, former chair of the physics department\, will spea k about his career trajectory and experience in both research and administr ation of a physics department (ours!). He also recently spent time as a pro gram manager with the DOE\, and will offer his insights into the career pat h of a physicist. Please join - in person!

Location: Toll 1201\, 4pm
Also on Zoom: \; \; https://umd.zoom.us/j/97540478019 LAST-MODIFIED:20220617T080556Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Prof. Drew Baden\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T110000 DTEND;TZID=America/New_York:20210913T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20210913T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Sebastian Will\, Columbia University\n\nTitle: Creatin g Ultracold Dipolar NaCs Molecules\nAbstract: Ultracold dipolar molecules c ombine features of ultracold atoms and trapped ions. They promise new resea rch avenues in quantum simulation\, quantum computing\, and quantum chemist ry. But creating and taming ultracold systems of dipolar molecules is not a routine task. For example\, Bose-Einstein condensates of dipolar molecules have not been created\, yet.\n\nIn this talk\, I will discuss the creation of dipolar NaCs molecules in their absolute ground state. NaCs molecules h ave a large dipole moment of 4.6 Debye\, which will lead to strong long-ran ge dipole-dipole interactions. Over the past year\, we have created overlap ping Bose-Einstein condensates of Na and Cs [1]\, located Feshbach resonanc es of the quantum gas mixture\, and created near-degenerate gases of NaCs F eshbach molecules. Most recently\, we have made significant progress toward s NaCs molecules in their absolute ground state. With this system\, we plan to explore new quantum phases\, such as dipolar crystals and Mott insulato rs with fractional filling. Finally\, I will give a brief overview of a new effort that we recently started. Using programmable arrays of Sr atoms\, w e are working towards demonstrating collective effects\, such as subradianc e\, which may help enhancing coherence in many-body quantum systems in a fu ndamental way.\n\n[1] “Overlapping Bose-Einstein Condensates of Na and Cs”\ , C. Warner et al.\, arXiv:2106.01334 (2021)\n\nHost: Charles Clark LAST-MODIFIED:20220617T080549Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211101T110000 DTEND;TZID=America/New_York:20211101T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211101T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Thomas Purdy\, University of Pittsburgh

Title:& nbsp\;Sensing with optical and acoustic waves

Abstract : \;

In this seminar\, I will discuss several recent and ongoing e xperimental efforts in the Purdy Lab (which specializes in quantum sensors and transducers with optical\, mechanical\, and microwave systems)\, with a focus on some often overlooked or least under-appreciated aspects of relat ively simple measurements. \; We have recently completed the first deta iled study of acoustic blackbody radiation interacting with a nanomechanica l system. \; While the acoustic equivalent of the well-known electromag netic blackbody radiation should be equally ubiquitous\, there have been al most no experimental investigations. \; You might look at something and say: “That is glowing red\, it must be hot”\, but you don’t typically turn your head\, cup your ear\, and getting close (but not so close as to burn yourself) mention “Wow\, that is so loud\, it must be really hot”. \; W e have constructed and studied an optomechanical resonator\, whose dominant source of mechanical dissipation is the exchange of energy with a remote “ acoustic blackbody” (i. e. a mechanically lossy bit of material deposited o n the substrate\, that efficiently absorbs and emits thermal acoustic radia tion) via acoustic waves travelling through an acoustically transparent sub strate. \; Ultimately\, the concept of optomechanically detected acoust ic blackbody radiation will be incorporated with our previous experimental efforts in quantum-noise-calibrated optomechanical\, Brownian-motion thermo metry to create a chip-scale primary thermometer that can sense the tempera ture of a macroscopic volume via a nano-opto-mechanical transducer.

A nother ongoing effort is to understand and eventually surpass the quantum l imits of optical lever detection of a nanobeam. \; The optical lever\, where the angular deviation reflected light is used to measure the tilt of a surface\, is arguably one of the oldest precision optical measurement tec hniques. \; It is still in common use today in atomic force microscopy\ , industrial sensing applications\, and precision metrology because of its simplicity\, robustness\, and excellent sensitivity. \; However\, there has been very little work to understand the fundamental quantum limits of this measurement technique. \; Due to recent advances in ultralow dissi pation nanomechanical systems\, it has now become experimentally relevant t o consider and overcome such limits. \; A Heisenberg measurement—distur bance uncertainty relation is enforced by the optical torque noise from pho tons recoiling off a surface into different spatial modes. \; By a simp le rearrangement of the lenses in our optical lever detection system\, we f ind that the effects of optical backaction can be evaded by exploiting opto mechanically induced optical correlations. \; We have demonstrated this effect to cancel classical laser noise and are working to upgrade our syst em to perform optical lever detection below the standard quantum limit.&nbs p\; Time permitting\, I will also briefly discuss other ongoing efforts in the lab to transduce quantum signals between the mechanical\, optical\, and microwave domains for applications in quantum information.



Host: Kartik Srinivasan LAST-MODIFIED:20220617T080546Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210426T160000 DTEND;TZID=America/New_York:20210426T170000 DTSTAMP:20220808T214455Z UID:6he7qnpm9dt692jcfcufhg48m3@google.com RECURRENCE-ID;TZID=America/New_York:20210426T160000 CREATED:20210423T163414Z DESCRIPTION:Speaker: Tomer Volansky\, Tel Aviv University

Title: Why Chase Ambulances?

Abstract: Every now and then\, a new experimental result is reported\, hinting towards new physics. The subsequent "ambulanc e chasing” phenomena in which many papers are written shortly after the res ult is published\, is sometimes (and justifiably) criticized. In this talk\ , I will discuss the positive aspects of ambulance chasing\, demonstrating new ideas that stem from such studies. Two recent case studies will be cons idered: the EDGES sky-average 21-cm absorption signal and the XENON1T elect ron-recoil result.

For zoom link please email: mknouse@umd.edu LAST-MODIFIED:20220617T080546Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211011T160000 DTEND;TZID=America/New_York:20211011T173000 DTSTAMP:20220808T214455Z UID:45g0cnu7c2mj3vneum43g4q0m3@google.com RECURRENCE-ID;TZID=America/New_York:20211011T160000 CREATED:20210924T113653Z DESCRIPTION:Speaker : \;Richmond Wang



Advisor: \;Ichiro Takeuchi

Title: Perovskit e Rare-Earth Nickelates: Metal-to-Insulator Transition in Samarium Nickelat e Thin Films


Abstract: \;Perovskite rare-earth nickelates\, RNiO 3 (R = Sm\, La\, Nd…)\, are materials which have been investigated due to t he tunability of their physical properties\, such as electronic and optical properties. One key feature in these materials is a sharp metal-to-insulat or transition (MIT)\, where the material undergoes a phase transition at a certain temperature\, TMIT. This transition temperature varies between each rare-earth element used\, and can be tuned through a variety of methods\, such as inducing strain on the thin films. Samarium nickelate (SNO) is a ra re-earth nickelate which features a TMIT above room temperature for bulk ma terials at approximately 400K. The tuning of this transition temperature al lows this material to become more suitable for applications near room tempe rature. The MIT of the SNO thin films also allows for a property known as z ero-differential thermal emission\, which allows for the tuning of the ther mal emissivity of these thin films at varying temperatures. \;

N ote: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20220617T080543Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Richmond Wang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211213T110000 DTEND;TZID=America/New_York:20211213T120000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com RECURRENCE-ID;TZID=America/New_York:20211213T110000 CREATED:20210708T004621Z DESCRIPTION:Speaker: Leah Dodson\, Department of Chemistry and Biochemistry \, UMCP

Title: New Technology for Exploring State-Dependent Reactivi ty in Radiative Association Reactions

Abstract: \;Recent advance s in investigating radiative association (RA) reactions by quantum dynamics methods have revealed troubling discrepancies when compared with the react ion rates obtained using statistical methods\, sometimes differing by up to four orders of magnitude. Notoriously difficult to measure in the laborato ry\, RA experiments are necessary to test the application of theoretical mo dels to real systems. A new laboratory effort is being undertaken in the Ch emistry Department at UMD to develop the tools necessary to experimentally measure rate constants for RA reactions at temperatures relevant to the int erstellar medium (down to 10 K). The instrument combines a cryogenic buffer -gas beam with a cryogenic ion trap in order to investigate ion/molecule RA reactions as a function of temperature. In this talk\, I will describe our progress toward the development of an instrument capable of directly measu ring the temperature-dependent reactivities with the immediate goal of meas uring the rate constants for a series of RA reactions between magnesium mon ocations (Mg+) and cyanopolyyne (HC2n+1N\,&n bsp\;n \;= 0–3) neutral molecules. These experiments will shed light on disagreement between theoretical RA studies\, while also providin g experimentally-measured rate constants for reactions that are relevant to astrochemistry.

Host: Charles Clark LAST-MODIFIED:20220617T080540Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220615T150000Z DTEND:20220615T160000Z DTSTAMP:20220808T214455Z UID:4usv2sp3jrpi9uo6mn0vq0hmm2@google.com CREATED:20220615T144117Z DESCRIPTION:Title: Describing so lutions to QMA problems
Speaker: Chinmay Nirkhe (UC Berkeley)
Time: Wednesday\, June 15\, 2022 - 11:00am
Location: ATL 3100A and Virtual V ia Zoom:  https://umd.zoom.us/j/968456988 94    Meeting ID: 968 4569 8894

In this talk\, I'\;ll motivat e studying the complexity of quantum states and transformations. I'\;ll discuss how this general study is related to a seminal theoretical computer science concept: search vs. decision. I'\;ll show how to construct a fo rm of search-to-decision reductions for QMA problems and show why it is unl ikely that we can do (much) better. I'\;ll conclude by discussing a para metrized notion of QMA and the notion of QMA solutions in this context.

This talk will be based on a work with Irani\, Natarajan\, Rao and Yuen (https://arxiv.org/abs/2111.02999) an d a work with Arunachalam\, Bravyi\, and O'\;Gorman (https://arxiv.org/abs/2202.08119).

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Meeting ID: 968 4569 8894
LAST-MODIFIED:20220615T144117Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96845698894 Meeting ID: 968 4569 8894 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Chinmay Nirkhe TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220609T140000Z DTEND:20220609T150000Z DTSTAMP:20220808T214455Z UID:1pki7kv2khnukvjmoidoepmqvq@google.com CREATED:20220530T024447Z DESCRIPTION:Title: Quantum simulations of topological Majorana modes
Speaker: Oles Shtanko (IBM)
Time: Thursday\, June 9\, 2022 - 10:00am
Location: PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/79 84811536

Quantum devices hold promise to outperform classical co mputers in performing some physical simulations in the nearest future\, mak ing them a valuable tool for physics research. In this talk\, Oles will foc us on quantum simulation of the topological states of matter hosting Majora na modes -- the exotic "half-electron" states. He will show the results obt ained from noisy quantum hardware provide us with accurate prediction of Ma jorana mode wavefunctions. This experiment also allows us to verify the top ological nature of observed modes. In addition\, he will demonstrate a new\ , non-adiabatic braiding method that enables us to obtain the exchange stat istics. Thus\, we establish the use of current cloud-based quantum simulati ons in studying topological many-body phenomena.
LAST-MODIFIED:20220609T215029Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/7984811536 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Seminar: Oles Shtanko TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220705T150000Z DTEND:20220705T160000Z DTSTAMP:20220808T214455Z UID:3dt0ql6ksco2h0a1opo9e8ar5g@google.com CREATED:20220609T210304Z DESCRIPTION:Bowen Yang (Caltech)\n\nDetails TBA LAST-MODIFIED:20220609T210304Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220614T151500Z DTEND:20220614T160000Z DTSTAMP:20220808T214455Z UID:0i0tgoivmtiv97sg8d96m9m0ph@google.com CREATED:20220608T151218Z DESCRIPTION:When: 6/14 at 11:15 am
Where: ATL4402 (CMTC Co nference Room)
Schedule:
11:15 - Ali Lavasani
11:30 - Yi-Hu a Lai
11:45 - Subhayan Sahu LAST-MODIFIED:20220608T151218Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Graduate Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220614T140000Z DTEND:20220614T150000Z DTSTAMP:20220808T214455Z UID:2egvach8jmg9todm3948ma4h27@google.com CREATED:20220608T150919Z DESCRIPTION:
When: 6/14 at 10 am
Where: Zoom \;https://umd.zoom.us/j/8414181584?pwd=TlMxTkc2eHFjU3E1ck5NS1FsVVh2dz09
Speaker: Xiao-Gang W en (MIT)
Title: Classify phases and continues phase transitions f rom categorical symmetry and its condensable algebras
Abstract: & nbsp\;We study possible phases and possible continuous phase transitions in systems with a given finite symmetry. We use the corresponding categorical symmetry and its condensable algebras to classify the possible gapped phas es and possible gapless critical points\, as well as determine the CFT of t he critical points in 1+1D.
Host: Yu-An Chen LAST-MODIFIED:20220608T150919Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Zoom Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220607T150000Z DTEND:20220607T160000Z DTSTAMP:20220808T214455Z UID:3jr403bgej5lkibe601950ubq3@google.com CREATED:20220602T163512Z DESCRIPTION:Speaker: Giulio Pasqualetti\n\nTitle: Probing the 2D SU(N) Ferm i-Hubbard Model with ultracold ytterbium\n\nAbstract: The Fermi-Hubbard mod el (FHM) describes the interplay between kinetic energy and onsite interact ion of particles on a lattice. Cold atoms in an optical lattice have proven to be a particularly suitable platform to probe its properties\, complemen ting analytical and numerical simulations. Most of the experimental works\, however\, have focussed so far on the SU(2) case\, featuring spin-1/2 part icles. In our experiment\, we implement the SU(N) FHM\, which describes par ticles with N spin components and presents a richer and still poorly unders tood physics compared with the SU(2) case. To do so\, we use ytterbium-173\ , which naturally features a SU(6)-symmetry in the ground state\, and allow s us to investigate the SU(N) FHM for N smaller or equal to 6. After loadin g the atoms in a 2D square optical lattice\, we probe the thermodynamics of the system looking at different observables as a function of temperature\, interactions and spin components\, and we benchmark our measurements with theoretical models. LAST-MODIFIED:20220602T163630Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220607T150000Z DTEND:20220607T160000Z DTSTAMP:20220808T214455Z UID:5es249k9nnig37tnbb1ceu7nce@google.com CREATED:20220530T024125Z DESCRIPTION:Title: Candidate for a self-correcting quantum memory in two d imensions\nSpeaker: Simon Lieu (QuICS)\nTime: Tuesday\, June 7\, 2022 - 1 1:00am\nLocation: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/28217 42741?pwd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09\n\nAn interesting problem in the field of quantum error correction involves finding a physical system t hat hosts a "\;self-correcting quantum memory\,"\; defined as an e ncoded qubit coupled to an environment that naturally wants to correct err ors. To date\, a quantum memory stable against finite-temperature effects is only known in four spatial dimensions or higher. Here\, we take a differ ent approach to realize a stable quantum memory by relying on a driven-di ssipative environment. We propose a new model which appears to self-correc t against both bit-flip and phase-flip errors in two dimensions: A square l attice composed of photonic "\;cat qubits"\; coupled via dissipati ve terms which tend to fix errors locally. Inspired by the presence of two distinct Z_2-symmetry-broken phases\, our scheme relies on Ising-like diss ipators to protect against bit flips and on a driven-dissipative photonic e nvironment to protect against phase flips. LAST-MODIFIED:20220530T024125Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/2821742741?p wd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special RQS Seminar: Simon Lieu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220519T140000Z DTEND:20220519T150000Z DTSTAMP:20220808T214455Z UID:76hfvo3ght4noc56vqmlnej6s2@google.com CREATED:20220510T174427Z DESCRIPTION:Title: Dequantizing the Quantum Singular Value Transfor mation: Hardness and Applications to Quantum Chemistry and the Quantum PCP Conjecture
Speaker: Sevag Gharibian (Paderborn University)
Time: Th ursday\, May 19\, 2022 - 10:00am
Location: Virtual Via Zoom: https: //uwaterloo.zoom.us/j/99584979176?pwd=R3FWeU5xK3FJT3pTYzFJek5pcVU0QT09< br>
The Quantum Singular Value Transformation (QSVT) is a recent techniq ue that gives a unified framework to describe most quantum algorithms disco vered so far\, and may lead to the development of novel quantum algorithms. In this paper we investigate the hardness of classically simulating the QS VT. A recent result by Chia\, Gilyén\, Li\, Lin\, Tang and Wang (STOC 2020) showed that the QSVT can be efficiently "\;dequantized"\; for low- rank matrices\, and discussed its implication to quantum machine learning. In this work\, motivated by establishing the superiority of quantum algorit hms for quantum chemistry and making progress on the quantum PCP conjecture \, we focus on the other main class of matrices considered in applications of the QSVT\, sparse matrices.

We first show how to efficiently &quo t\;dequantize"\;\, with arbitrarily small constant precision\, the QSVT associated with a low-degree polynomial. We apply this technique to design classical algorithms that estimate\, with constant precision\, the singula r values of a sparse matrix. We show in particular that a central computati onal problem considered by quantum algorithms for quantum chemistry (estima ting the ground state energy of a local Hamiltonian when given\, as an addi tional input\, a state sufficiently close to the ground state) can be solve d efficiently with constant precision on a classical computer. As a complem entary result\, we prove that with inverse-polynomial precision\, the same problem becomes BQP-complete. This gives theoretical evidence for the super iority of quantum algorithms for chemistry\, and strongly suggests that sai d superiority stems from the improved precision achievable in the quantum s etting. We also discuss how this dequantization technique may help make pro gress on the central quantum PCP conjecture.

Joint work with Francoi s Le Gall (Nagoya University).

(In person viewing at 3100A Atlantic Building) LAST-MODIFIED:20220510T174427Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/99584979176?pwd=R3FW eU5xK3FJT3pTYzFJek5pcVU0QT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Sevag Gharibian TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220510T150000Z DTEND:20220510T160000Z DTSTAMP:20220808T214455Z UID:4s5h07ulu3vp0ahitqtbt5kgmj@google.com CREATED:20220207T183307Z DESCRIPTION:Speaker: Dr. Kathrin Breuker\, University of Innsbru ck

Title: Mass Spectrometry of RNA

Abstract: \;Mass spectrometry (MS) is an evolving technique in the field of RN A research. This talk will highlight the use of high resolution FT-ICR (Fou rier transform ion cyclotron resonance) MS for the study of RNA modificatio ns and RNA interactions with proteins and small molecule ligands. LAST-MODIFIED:20220510T164747Z LOCATION:Online via zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220509T190000Z DTEND:20220509T203000Z DTSTAMP:20220808T214455Z UID:3h7r9b9fed764a7ta5ot0qardm@google.com CREATED:20220104T152557Z DESCRIPTION:Speaker: Takemichi Okui\, Florida State Unive rsity

Title: "1+1=4"? The strong CP problem\, small Dirac neutrino m asses\,
baryogenesis\, and dark matter.

Abstract: On the one hand \, the QCD axion is a compelling solution to
the strong CP problem. On t he other hand\, the compositeness of
right-handed neutrinos offers a nat ural mechanism for small Dirac
neutrino masses - if the neutrinos turn o ut to be Dirac - and explains
why the lepton number must be conserved so well. If these two old\,
completely unrelated extensions of the SM happ en to be both present in
the theory with no further additions\, it turns out that there exists a
region in the parameter space where the strong CP problem is solved\,
neutrinos are naturally Dirac and light\, and the correct cosmological
baryon asymmetry and dark matter abundance are obt ained\, all
simultaneously without contradicting existing bounds. In add ition\, the
theory predicts that \\Delta N_eff >\; 0.14 from CMB and t hat the axion
mass falls in the range between ~0.01 and ~10 meV. Both pr edictions
can be tested in near-future CMB and axion experiments.

Slides
LAST-MODIFIED:20220510T153335Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220511T140000Z DTEND:20220511T153000Z DTSTAMP:20220808T214455Z UID:11n4ckpuf4in5695fc8d5jpcsl@google.com CREATED:20220510T151847Z DESCRIPTION:\nTitle: Renormalon Effects in the Calculation of Parton Distri bution Functions on Lattice\n\nAbstract: Perturbative calculations of the q uasi-parton distributions (PDF) contain factorially growing coefficients at high order due to the renormalon ambiguity in the Wilson line self energy. Such renormalon effects introduce extra systematic uncertainties to our ex tractions of PDFs from lattice data\, and could hardly be avoided if we aim at high precision calculation of the lightcone distributions on lattice. I n this work\, we propose an approach to properly determine the renormalon c ontributions in the Wilson line self energy from lattice data\, and to perf orm the renormalization and matching of the lattice data in a consistent wa y. LAST-MODIFIED:20220510T151847Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Rui Zhang Candidacy Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220511T193000Z DTEND:20220511T203000Z DTSTAMP:20220808T214455Z UID:69rq40oosg00tnpttf3pmo7f7m@google.com CREATED:20220509T135755Z DESCRIPTION:

Quantum Characterization and Control: Theory\, Practice a nd Potential

 \;

Jonathan L DuBois\, Ph. D. will presen t an overview of some recent work from the Quantum Coherent Device Physics Group at Lawrence Livermore National Lab (LLNL) with a focus on open and cl osed-loop feedback control of superconducting qubits.

 \;

< b>Bio: \;Dr. DuBois received a PhD in computational condensed matte r theory in 2003 from the University of Delaware. His research interests in clude computational condensed matter physics\, quantum systems architecture and application co-design\, quantum optimal control\, and hybrid quantum-c lassical algorithm development. He currently leads the Quantum Coherent Dev ice Physics Group at LLNL.

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Jonathan L DuBois\, Ph. D. will prese nt an overview of some recent work from the Quantum Coherent Device Physics Group at Lawrence Livermore National Lab (LLNL) with a focus on open and c losed-loop feedback control of superconducting qubits.

 \;

Bio: \;Dr. DuBois received a PhD in computational condensed matt er theory in 2003 from the University of Delaware. His research interests i nclude computational condensed matter physics\, quantum systems architectur e and application co-design\, quantum optimal control\, and hybrid quantum- classical algorithm development. He currently leads the Quantum Coherent De vice Physics Group at LLNL.

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Meeti ng password: 6e4tWc7DbV2 \;

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LAST-MODIFIED:20220509T135755Z LOCATION:https://lpscp.webex.com/lpscp/j.php?MTID=m7eaea23cfe241280df710178 3ec46b94 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar: Quantum Characterization and Control: Theory\, Practic e and Potential TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220510T150000Z DTEND:20220510T160000Z DTSTAMP:20220808T214455Z UID:3sg05s73gduoo97s8cuk5jl7pl@google.com CREATED:20220218T185430Z DESCRIPTION:Speaker: \;Dr. Shinsei Ryu (Princeton Uni versity)
Where: ATL4402
Title: \; \;Mult ipartite correlations in topological liquids
Abstract: \;I wi ll discuss entanglement quantities in two-dimensional topologically-ordered phases that can potentially capture correlations beyond what bipartite ent anglement entropy can. Specifically\, I will present the calculations of th e reflected entropy and entanglement negativity for topological ground stat es when we consider two spatial sub regions. I will also discuss applicatio ns of these ideas to one-dimensional quantum lattice many-body systems.
Host: Ryohei Kobayashi


Email emartin3@umd.edu for questions
LAST-MODIFIED:20220505T203422Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220512T190000Z DTEND:20220512T203000Z DTSTAMP:20220808T214455Z UID:1r2c6ruq5bnit5fo39ukr7cvm3@google.com CREATED:20220422T171808Z DESCRIPTION:
Title: Quantum Algorithms for Simulation and Sp ectroscopy of Nuclear Physics
Abstract: In t his talk I will discuss ongoing progress in two projects. The first project is related to implementing the time-evolution operator corresponding to th e Kogut-Susskind formulation of Lattice Gauge Theories (U(1)\, SU(2)\, and SU(3))\, and an improvement thereof called the Loop-String-Hadron formulati on. We give a simple\, generic method of decomposing a Hamiltonian into a m inimal sum of easily-diagonalizable summands\, suitable to plug into Trotte r- or Block-Encoding-based Hamiltonian simulation methods. For the SU(3) fe rmion-gauge interaction term\, our method decreases the complexity by a fac tor of ~1/500 over prior art. I will also discuss major obstacles in giving feasible algorithms for quantum simulations of Lattice Gauge Theories\, wh ich I hope to address over the course of my PhD. \; The second project is about understanding how we could use quantum computers to learn excited eigenvalues of lattice nuclear theories. I will compare textbook phase esti mation to recently-developed block-encoding-based methods\, applied to a Ch iral Effective Field Theory Hamiltonian. LAST-MODIFIED:20220505T174517Z LOCATION:ATL 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Alexander Shaw Candidacy Talk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220512T140000Z DTEND:20220512T150000Z DTSTAMP:20220808T214455Z UID:5375ggk47faqsotgot4dh6h988@google.com CREATED:20220505T161826Z DESCRIPTION:Title: Software architectures for real-time quantum control sy stems\nSpeaker: Leon Riesebos (Duke University)\nTime: Thursday\, May 12\ , 2022 - 10:00am\nLocation: PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/7984811536\n\nReal-time control software and hardware is essential for operating modern quantum systems. I n particular\, the software plays a crucial role in bridging the gap betwee n applications and real-time operations on the quantum system. Unfortunatel y\, real-time control software is an often underexposed area\, and many wel l-known software engineering techniques have not propagated to this field. As a result\, control software is often hardware-specific at the cost of fl exibility and portability. In this presentation we will present techniques and tools that enable the development of reliable\, flexible\, and portable control software for real-time control systems. We present a modular softw are architecture for real-time control software and show that modular contr ol software can reduce kernel execution time overhead by 63.3% on average. Our code portability analysis shows that two distinctly different systems c an share between 49.8% and 91.0% of code statements. Additionally\, we will cover testing and simulation tools for real-time control software. We show that our kernel simulator is 6.9 times faster on average compared to execu tion on hardware while the position of the timeline cursor is simulated wit h an average accuracy of 97.9%. LAST-MODIFIED:20220505T162708Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/7984811536 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RQS Seminar: Leon Riesebos TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220520T180000Z DTEND:20220520T200000Z DTSTAMP:20220808T214455Z UID:0ern6o1d05trsqr7rut8jleebp@google.com CREATED:20220505T162637Z DESCRIPTION:Title: Quantum algorithms and the power of forgetting\nSpeaker : Amin Shiraz Gilani (QuICS)\nTime: Friday\, May 20\, 2022 - 2:00pm\nLoca tion: ATL 3100A\n\nThe so-called Welded Tree Problem provides an example o f a black-box problem that can be solved exponentially faster by a quantum walk than by any classical algorithm (https://arxiv.org/pdf/quant-ph/0209131.pdf). Given the name of a special ENTRANCE vertex\, a quantum walk can find another distinguished EXI T vertex using polynomially many queries\, though without finding any parti cular path from ENTRANCE to EXIT. It has been an open problem for twenty ye ars whether there is an efficient quantum algorithm for finding such a path \, or if the path-finding problem is hard even for quantum computers. We sh ow that a natural class of efficient quantum algorithms provably cannot fin d a path from ENTRANCE to EXIT in the Welded Tree Problem. Specifically\, w e consider algorithms that\, within each branch of their superposition\, al ways store a set of vertex labels that form a connected subgraph including the ENTRANCE\, and that only provide these vertex labels as inputs to the o racle. While this does not rule out the possibility of a quantum algorithm that efficiently finds a path\, it is hard to imagine how an algorithm coul d benefit by deviating from this behavior. Our no-go result suggests that\, to outperform classical computation\, quantum algorithms must necessarily forget the path they take to reach a solution. LAST-MODIFIED:20220505T162637Z LOCATION:ATL 3100A SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Master's Thesis Defense: Amin Shiraz Gilani TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220511T193000Z DTEND:20220511T203000Z DTSTAMP:20220808T214455Z UID:6tunn8gjpctcj57hishl1c9qle@google.com CREATED:20220505T160406Z DESCRIPTION:Comparisons of neutral density profile prediction s using SOLPS-ITER with experimental neutral profiles in the Alcator C-Mod tokamak

Richard Reksoatmodjo\, \; William and Mary
 \ ;
Abstract : Accurate modeling of edge neutral distributions in future h igh-field tokamaks has strong consequences for both fueling and pedestal sh ape predictions. We evaluate the ability of SOLPS-ITER\, a two-dimensional fluid plasma/kinetic Monte Carlo neutral code\, to accurately simulate the upstream neutral density profiles of L-mode\, I-mode\, and H-mode discharge s in the Alcator C-Mod tokamak for which experimental neutral densities hav e been inferred from direct Lyman-alpha emission measurements. To eliminate possible propagated systematic errors in the conversion of the Lyman-alpha emission data to neutral density\, we make additional parallel comparisons between the modeled Lyman-alpha emissions versus the measured emissions an d the optimized modeled electron density and temperature profiles versus Th omson scattering profiles. We further evaluate comparisons between the infe rred ionization rate profiles versus the modeled ionization rates\, as a cl osely related validation parameter. We ultimately achieve SOLPS profiles of neutral density and Lyman-alpha emissions that are well within an order of magnitude of empirical data for all three discharges\, via iterative tunin g of the perpendicular transport coefficient profiles\, providing confidenc e in the fidelity of SOLPS neutral predictions.
 \;
 \; LAST-MODIFIED:20220505T160507Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220510T200000Z DTEND:20220510T213000Z DTSTAMP:20220808T214455Z UID:25ktfdgvhapamhtnqjh363ks2d@google.com CREATED:20220120T220916Z DESCRIPTION:Speaker: Jeff Newman\, University of Pittsburgh

< b>DESI and Beyond: Exploring the Universe with Spectroscopic Surveys


Abstract: Over the past two decades\, large spectroscopic surv eys have measured the redshifts of millions of individual galaxies an d quasars\, allowing us to map the three-dimensional distribution of matter in the Universe.  These experiments help to constrain the nature of dark energy by measuring the baryonic acoustic oscillation (BAO) distance scale\, test for deviations from general relativity by measuring redshift-s pace distortions in the observed clustering of galaxies\, and place limits on neutrino masses via the strength of clustering signals.  In this talk\, I will primarily focus on the plans for and status of the ongoing Dark Ener gy Spectroscopic Instrument (DESI) survey. DESI is the first of the next-ge neration\, "Stage IV" dark energy experiments to begin operations.  I will also summarize key results from the recently-completed Sloan Digital Sky Su rvey-4 eBOSS survey\, which has helped to prototype methods now being used for DESI.  Finally\, I will briefly describe ideas for new telescopes and i nstruments that would enable surveys an order of magnitude larger than what is possible now\, as well as how such surveys would help us to understand our universe. LAST-MODIFIED:20220504T201233Z LOCATION:1412 Toll Physics Bldg SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220505T163000Z DTEND:20220505T173000Z DTSTAMP:20220808T214455Z UID:6l3pe4rtoqg9evlab9shijg2jk@google.com CREATED:20220504T190825Z DESCRIPTION:Seminar will be Conducted via zoom: https://umd.zoom.us/j/94067038750

Sp eaker: \;Sonia Bacca\, Mainz

Title: Electroweak reactions with n uclei

Abstract:
Electroweak reactions with nuclei are key observa ble to study: not only
are they relevant to nuclear physics\, but they a lso allow to connect to other field of physics\, such as particle physics.< br>
Beyond the lightest nuclear systems\, a first principle computation of electroweak reactions in terms of protons and neutrons interacting with external fields is complicated by the fact that the probe can break the nuc leus into many clusters\, leading to several simultaneously open reaction c hannels. A way to circumvent this problem is to use integral transforms.
Recently\, we provided a coupled-cluster theory formulation of the Lorentz integral transform\, obtaining a many-body method that allows to compute e lectroweak reactions and related observable in the medium-mass nuclei. I wi ll show some of our recent results and connect them to modern topics of nuc lear physics\, as well as neutrino physics.
LAST-MODIFIED:20220504T190825Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220509T150000Z DTEND:20220509T160000Z DTSTAMP:20220808T214455Z UID:6iqhu3inbc4nect1ol56sm7j01@google.com CREATED:20220502T165904Z DESCRIPTION:Speaker: Andrey Grankin\, UMD

Title: Enhanceme nt of superconductivity with external phonon squeezing

Abstract: Squeezing of phonons due to the nonlinear coupling to electrons is a way t o enhance superconductivity. In this talk I will present a model of quadrat ic electron-phonon interaction in the presence of phonon pumping and an add itional external squeezing. I will show that the interference between the t wo driving sources can lead to a stronger electron-electron attraction. Thi s allows for the enhancement of superconductivity\, which is shown to be ma ximal on the boundary with the dynamic lattice instabilities caused by driv ing. The considered model can be implemented in several experimental platfo rms.



Speaker: Aditya N. S harma\, UMD

Title: Precision-enhanced displacement measure ments using correlated photon pairs

Abstract: Split detection is a standard experimental scheme for measuring positional displacements. In a typical setup\, a laser beam is reflected from the object being probed an d then sent to a photodetector that is split into left (L) and right (R) ha lves: the normalized difference signal (R-L)/(R+L) is then proportional to the object’s horizontal displacement. The maximum precision achievable usin g this method is limited by the inverse of the beam width. In this talk\, I will present our experimental demonstration of a proposal to evade this li mitation using split detection of correlated photon pairs. The techniques d iscussed here may prove useful in measurement scenarios requiring high sens itivity at low light intensity.
LAST-MODIFIED:20220504T134426Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220504T173000Z DTEND:20220504T183000Z DTSTAMP:20220808T214455Z UID:2cof92cj43lk6uingt0n0vmb9b@google.com CREATED:20220413T135948Z DESCRIPTION:

Preceded by lunch at 12:30pm

Speaker: Raman Sundrum\, UMD

Title:  Sleptonic SUSY

Abstract: We study an attractive scenario\, ``Sleptonic SUSY''\, whi ch reconciles the 125 GeV Higgs scalar and  
the non-observation of su perpartners thus far with
potentially pivotal roles for slepton phenom enology:
providing viable ongoing targets for LHC discovery\, incorpor ating
a co-annihilation partner for detectable thermal relic dark matt er\,
and capable of mediating  the existing muon $g-2$ anomaly.
< u>
LAST-MODIFIED:20220503T175348Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:*Special Joint JHU/UMD Seminar* TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220503T150000Z DTEND:20220503T160000Z DTSTAMP:20220808T214455Z UID:7dj5je8n8nbesfofmh6ndgvi39@google.com CREATED:20220425T184911Z DESCRIPTION:Speaker: Dr. Chaoxing Liu (Penn State Unive rsity)
Where: ATL4402
Title:  
Pseudo- Gauge Field in Dirac/Weyl Materials
Abstract: In solid ma terials\, electrons are usually described by the non-relativistic Schroding er equationsince electron velocity is much slower than the speed of light. However\, the relativisticDirac/Weyl equation can emerge as a low-energy ef fective theory for electrons in certainmaterials. These systems are dubbed “Dirac/Weyl materials” and provide a tunable platformto test quantum relati vistic phenomena in table-top experiments. Owing to the linear-inmomentum f orm\, a variety of physical fields\, e.g. strain and phonons\, can couple t oDirac/Weyl quasi-particles in a similar form as the minimal gauge coupling . These physicalfields thus are dubbed the “pseudo-gauge field”\, which pro vides a useful theoretical conceptto understand or predict a variety of phy sical phenomena beyond the electromagneticresponse in Dirac/Weyl materials. In this talk\, I will focus on the physical phenomena relatedto the pseudo -gauge field created by strain and phonons. I will first discuss the Berryc urvature contribution to the piezo-electric response\, which can be underst ood as the Hallcurrent response driven by strain-induced pseudo-electric fi eld [1]. Our theory predicts ajump of piezo-electric coefficients across a topological phase transition in 2D Diracmaterials. Then I will show that el ectron-phonon interaction in 2D Dirac materials also takesa gauge coupling form\, and consequently\, electron Berry curvature can appear in the effect iveaction of phonon dynamics [2]. This leads to a “helical texture” of phon on angularmomentum in the momentum space\, from which a heat current can dr ive a total phononangular momentum. Finally\, I will show phonons can also induce a gravitational torsion fieldfor the Kramers-Weyl fermions in chiral crystals and discuss the possibility of probing theNieh-Yan anomaly throug h thermal transport measurement [3]. 

References:[1] Piezoelectr icity and topological quantum phase transitions in two-dimensional spin-orb itcoupled crystals with time-reversal symmetry\, Jiabin Yu\, Chao-Xing Liu\ , NatureCommunications 11\, 2290 (2020).[2] Phonon Helicity Induced by Elec tronic Berry Curvature in Dirac Materials\, Lun-Hui Hu\,Jiabin Yu\, Ion Gar ate\, Chao-Xing Liu\, Phys. Rev. Lett. 127\, 125901\, 2021[3] Probing Nieh- Yan Anomaly through phonon dynamics in the Kramers-Weyl semimetalsof Chiral Crystals\, Chao-Xing Liu\, arXiv:2104.04859\, 2021.  
Host: Ji abin Yu


Email emar tin3@umd.edu for questions
LAST-MODIFIED:20220502T184939Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220502T190000Z DTEND:20220502T203000Z DTSTAMP:20220808T214455Z UID:73bmcphi6ekidng310kbabv3gm@google.com CREATED:20220124T160312Z DESCRIPTION:Speaker: Csaba Csaki\, Cornell

Title: Explorin g the phases of gauge theories via Anomaly Mediated Supersymmetry Breaking (AMSB)".

Abstract: Finding the vacuum structure of strongly coup led gauge theories is one of the important unsolved questions in particle p hysics. Within supersymmetric (SUSY) theories many of these questions have been largely resolved in the 1990's following the work of Seiberg and other s\, however so far we have not been able to convincingly connect these resu lts to their non-supersymmetric counterparts. Recently Murayama proposed to use anomaly mediated supersymmetry breaking (AMSB) to introduce the SUSY   breaking terms which allows finding results consistent with the qualitative expectations for the structure of the non-SUSY theories. In this talk I fi rst show how to apply this method to a class of chiral gauge theories based on antisymmetric and symmetric representations\, which leads us to propose novel symmetry breaking patterns for the vacuum of these theories\, and ca lls for modification of the old tumbling picture of confinement in chiral g auge theories. I then apply the method to the SO(N) series and show that fo r F<\; 3/2 (N-2) the theory will be confining\, where the dynamics of con finement is monopole condensation\, and identify the resulting global symme try breaking pattern.
LAST-MODIFIED:20220502T132941Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220504T140000Z DTEND:20220504T150000Z DTSTAMP:20220808T214455Z UID:0lvdpjp6bepg38hvl819847sv0@google.com CREATED:20220415T002601Z DESCRIPTION:Title: Encoded Silicon Qubits: A High-Performance &\; Scalable Platform for Quantum Computing
Speaker: Dr. Matthew Rakher (HRL Laboratories)
Time: Wednesday\, May 4\, 2022 - 10:00am
Loca tion: PSC 2136 and Virtual Via Zoom:  https://umd.zoom.us/j/91031026741

For quantum computers to achieve their promise\, regardless of the qubit technology\, significant improvements to both performance and scale are required. Quantum-dot-based qubits in silicon have recently enjoyed dr amatic advances in fabrication and control techniques. The “exchange-only” modality is of particular interest\, as it avoids control elements that ar e difficult to scale such as microwave fields\, photonics\, or ferromagneti c gradients. In this control scheme\, the entirety of quantum computation may be performed using only asynchronous\, baseband voltage pulses on strai ghtforwardly tiled arrays of quantum dots. The pulses control only a singl e physical mechanism\, the exchange interaction\, which exhibits low contro l crosstalk and exceptionally high on/off ratios. Exchange enables universa l logic within a qubit encoding that is robust against certain correlated e rrors. These aspects collectively provide a compelling path toward fault-t olerance. HRL Laboratories has recently demonstrated universal quantum log ic of encoded exchange-only Si spin qubits\, including two-qubit gates perf ormed on arrays of six quantum dots. In this seminar\, we will introduce t he fabrication and operation principles of these encoded Si qubit devices\, and we will show recent experimental results.

References:
1. Encoded 2-qubit gate: https:/ /arxiv.org/abs/2202.03605
2. State preparation and measurement: https://arxiv.org/abs/2112.09801 (https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum .3.010352)
3. Device Design and Fab: https://arxiv.org/abs/2107.10916 (https://pubs.acs.org/doi/10.1021/ acs.nanolett.1c03026)

Host: Kartik Srinivasan

11: 00 am - 12:00 pm ET (discussion time with students/postdocs interested in H RL Laboratories)
LAST-MODIFIED:20220429T223956Z LOCATION:PSC 2136 and Virtual Via Zoom: https://umd.zoom.us/j/91031026741 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS Special Seminar: Dr. Matthew Rakher TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220503T200000Z DTEND:20220503T213000Z DTSTAMP:20220808T214455Z UID:328i8kmi116qopntcrikkba0sb@google.com CREATED:20220120T221416Z DESCRIPTION: LAST-MODIFIED:20220429T200628Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:No Physics colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220506T190000Z DTEND:20220506T200000Z DTSTAMP:20220808T214455Z UID:7ht7l0m5kar8vqepvfc3jpt3an@google.com CREATED:20220429T173146Z DESCRIPTION:

Regina Caputo (GSFC) 

AMEGO-X Mission Concept

Gamma-ray and multimessenger astrophy sics are frontiers for discovery and uniquely provide access to the extreme processes that sculpt the universe. As a priority theme of the Astro2020 D ecadal Survey report: New Messengers New Physics\, this science is poised t o revolutionize our understanding of the extreme universe. Data from NASA’s Fermi mission demonstrated that the extreme processes that produce gravita tional waves and accelerate neutrinos and cosmic rays also produce gamma ra ys. In other words\, multimessenger sources are gamma-ray sources. Now is t he time to develop a powerful mission to fill these critical capability gap s revealed by Fermi and fully capitalize on this exciting new era of multim essenger astrophysics. 

The All-sky Medium Energy Gamma-ray Observatory eXplorer (AMEGO-X) is the next logical missio n after Fermi. During its three-year baseline mission\, AMEGO-X will observ e nearly the entire sky every two orbits\, building up a sensitive all-sky map of gamma-ray sources and emission. It will also access >\;50% (<\;1 0 MeV) and >\;20% (>\;10 MeV) of the sky instantaneously\, maximizing t ransient detections and rapid alerts\, openly distributed to the astrophysi cs communities. As a result\, AMEGO-X will deliver breakthrough discoveries for a MIDEX class in areas highlighted as the highest scientific priority for Explorer-scale missions in the Astro2020 Decadal Survey Report: gravita tional waves\, multimessenger astrophysics and time-domain astronomy. This talk presents an overview of the science\, instrument\, and mission that wa s submitted in the recent 2021 NASA MIDEX Announcement of Opportunity.

========================================

Carolyn Kierans (GSFC) 

Exploring the MeV Sky with COSI

The Compton Spectromet er and Imager (COSI) is a soft gamma-ray telescope that was recently select ed to be NASA’s next SMEX mission with a launch in 2025. COSI is designed t o uncover the source of Galactic positrons\, image diffuse emission from st ellar nucleosynthesis\, and perform polarization studies of gamma-ray burst s and compact objects. With unprecedented sensitivity in the MeV range\, CO SI is expected to provide advances in multimessenger astrophysics and revea l other sources of gamma-ray emission. In this presentation we will give an overview of COSI’s main science goals and discuss the telescope technology and maturation path through its successful balloon program.

< span>

Refreshments and physics discuss ion will take place prior to the seminars. 


< p> 

LAST-MODIFIED:20220429T173236Z LOCATION:1136 PSC SEQUENCE:1 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220504T193000Z DTEND:20220504T203000Z DTSTAMP:20220808T214455Z UID:79ph1afj5179mi2462d6tsk8k5@google.com CREATED:20220429T154303Z DESCRIPTION:

Exploring transformative startup solutions for magnetically confined fusio n plasmas

Stephanie Diem\, \; University of Wisconsin

 \;
Abstract : The potential to use fusion as a carbon-free\, fuel-abundant energy source to meet the world's growing energy demands ha s motivated significant US and international research. One research path to wards the realization of fusion energy involves tokamaks that magnetically confine hot plasmas in the shape of a torus. Almost every tokamak fusion reactor in the world relies on magnetic induction from a central solenoid to drive the current necessary to create a fusion grade plasma. Minimizing or completely eliminating the need for a central solenoid in a tokamak wo uld greatly simplify the construction and reduce the cost of these device s\, increasing their viability for commercial energy production. Solenoid- free startup techniques such as helicity injection (HI) and radiofrequency (RF) wave injection offer the potential of reducing the technical require ments of\, or possibly the need for\, a central solenoid. A major upgrade is underway for the spherical tokamak facility\, Pegasus-III at the Univer sity of Wisconsin-Madison. The new facility will provide a dedicated US pl atform to study innovations in plasma startup techniques\, allowing for st udies of both HI and RF during plasma initiation\, ramp-up and sustainment . Experimental plans for RF heating and current drive in OA the microwave r ange of frequencies will be presented. The new capabilities of the Pegasus -III facility will provide a bold test of the viability of a non-solenoidal compact tokamak using reactor relevant techniques.

Marc Swisdak\, swisdak@umd.edu \;

LAST-MODIFIED:20220429T154344Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220504T150000Z DTEND:20220504T160000Z DTSTAMP:20220808T214455Z UID:5i00qfdsh263t7jg0cgmd79600@google.com CREATED:20220207T164303Z DESCRIPTION:Speaker: Professor Monica Olvera de la Cruz\, Northw estern University

Title: Control of Soft Matter

Abstract:& nbsp\;
Heterogeneousmolecules such as amphiphiles and biopol ymers are ubiquitous components of lifeand physical sciences. In this talk\ , I will describe how to control theorganization and key functions of heter ogeneous molecules into functionalstructures such as catalytic closed shell s and co-assemblies ofpolyelectrolytes with enzymes into membranes that mim ic organelles.

LAST-MODIFIED:20220429T125134Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220503T171500Z DTEND:20220503T181500Z DTSTAMP:20220808T214455Z UID:73757hpmfqi6o9ue8uim8jpo21@google.com CREATED:20220207T155816Z DESCRIPTION:Speaker: Dr. Monica Olve ra de la Cruz\, Northwestern University

Title: Metalli zation of Colloids

Abstract: \;
Numerous collo idal crystals have been designed and devised following
design rules akin to atomic crystals. I will review techniques using functionalization
an d/or electrostatic interactions in mediating interactions among nanoparticl es. I will
discuss the resulting properties of the crystals including tr ansport mediated by a
localization to delocalization transition (LDT) in mixtures of asymmetric in size
nanoparticles where the small nanopartic les roam the crystal holding the large
nanoparticles in specific lattice s sites\, akin to electron clouds in atomic metals. The
LDT\, when disco ntinuous\, is driven by lattice vibrations. It is observed in many systems\ ,
including atomic system\, such as superionics\, where it is known as s ublattice melting. LAST-MODIFIED:20220429T125018Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220504T193000Z DTEND:20220504T203000Z DTSTAMP:20220808T214455Z UID:48ciemhjtb0pp7b3fkaa7mdg59@google.com CREATED:20220428T144519Z DESCRIPTION:
Quantum error correction on a superconducting system w ith heavy hexagon topology
 
Superconducting qubit based syst ems have made tremendous strides in device performance\, from improved cohe rences to lowered single- and two-qubit gate errors\, and high-fidelity mid -circuit measurements and qubit resets. In this talk\, I will present recen t progress towards fault tolerant quantum error correction on superconducti ng qubit systems that leverages the resources from improved device performa nce. I will focus on experimental demonstrations on a heavy-hexagon topolog y\, an arrangement that reduces lattice connectivity compared to other popu lar low-degree parity-check codes in order to mitigate cross-talk between f ixed-frequency transmon qubits. I will describe some of the encoding\, synd rome extraction\, and decoding operations that can be tailored to this topo logy focusing on d = 2 and 3 codes. The code design\, along with the curren t level of hardware noise\, place this system in a very favorable path for the coming years in the quest for scalable\, fault-tolerant quantum error c orrection. Our results and preliminary simulations highlight not only the v ersatility and flexibility of the underlying heavy-hexagon topology\, but a lso the importance of tailoring a decoder when implementing these protocols . 
 
Maika Takita is a Research Staff Member at IBM Quantu m\, with expertise in experimental quantum computation. She joined IBM in 2 015 after completing her Ph.D. in Electrical Engineering from Princeton Uni versity. Takita specializes in the control\, characterization\, and benchma rking of multi-qubit quantum systems. As a co-PI of IARPA's LogiQ program\, she is also leading a team towards implementing fault tolerant quantum err or correction codes on superconducting qubit lattices
 

  
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LAST-MODIFIED:20220428T144519Z LOCATION:https://lpscp.webex.com/lpscp/j.php?MTID=ma468e2adc502259d284daa69 bf364184 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar Series: Quantum error correction on a superconducting s ystem with heavy hexagon topology TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220505T140000Z DTEND:20220505T150000Z DTSTAMP:20220808T214455Z UID:2frcqm4ftq8jke473j0i97ekgr@google.com CREATED:20220428T011903Z DESCRIPTION:Title: LDPC Quantum Codes: Recent developments\, Challenges an d Opportunities\nSpeaker: Nikolas Breuckmann (University College London)\n Time: Thursday\, May 5\, 2022 - 10:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/95894683976\n\nQuantum error correc tion is an indispensable ingredient for scalable quantum computing. We disc uss a particular class of quantum codes called "quantum low-density parity- check (LDPC) codes." The codes we discuss are alternatives to the surface c ode\, which is currently the leading candidate to implement quantum fault t olerance. We discuss the zoo of quantum LDPC codes and discuss their potent ial for making quantum computers robust with regard to noise. In particular \, we explain recent advances in the theory of quantum LDPC codes related t o certain product constructions and discuss open problems in the field.\n\n (In person viewing at 3100A Atlantic Building) LAST-MODIFIED:20220428T011903Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/95894683976 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Nikolas Breuckmann TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220428T163000Z DTEND:20220428T180000Z DTSTAMP:20220808T214455Z UID:0j9tko0blkaedm08gpvjgveao2@google.com CREATED:20220406T192556Z DESCRIPTION:Speaker: Ingo Tews\, LANL

Title: From N uclei to Neutron Stars with Chiral Effective Field Theory and Multimessenge r Astrophysics

Abstract:
Neutron stars contain the largest reservoirs of degenerate fermions\, reaching the highest densities
we can observe in the cosmos\, and probe matter under conditions that cannot b e recreated in
terrestrial experiments. Throughout the Universe\, a la rge number of high-energy\, cataclysmic
astrophysical collisions of ne utron stars are continuously occurring and provide an excellent
testbe d to probe the properties of matter at densities exceeding the density insi de atomic nuclei.
In addition\, these phenomena allow us to test theor ies of strong interactions.
In this talk\, I will show how to combine nuclear theory calculations using chiral effective field
theory and qu antum Monte Carlo methods with data from astrophysical multi-messenger
observations of neutron stars and from heavy-ion collisions of gold nuclei at relativistic energies
to improve our understanding of dense matter . I will show that constraints from heavy-ion
collision experiments sh ow a remarkable consistency with multi-messenger observations and
prov ide complementary information on nuclear matter at intermediate densities. This work
combines nuclear theory\, nuclear experiment\, and astrophys ical observations\, and shows how
joint analyses can shed light on the properties of neutron-rich supranuclear matter over the
density range probed in neutron stars.
LAST-MODIFIED:20220427T201439Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220427T183000Z DTEND:20220427T193000Z DTSTAMP:20220808T214455Z UID:4qsv3jegca5cla4npi7snn7a5s@google.com CREATED:20220427T172129Z DESCRIPTION:Title: Slicing duality and holographic cosmology

Abs tract: I will outline a recent proposal (https://arxiv.org /abs/2203.11220) for a holographic description of cosmological s pacetimes with negative cosmological constant in AdS/CFT correspondence. Th e microscopic Euclidean theory has a double reflection symmetry and involve s two 3D holographic CFTs coupled by non-holographic auxiliary 4D degrees o f freedom on a strip. The bulk dual Euclidean path integral is dominated by a 4D Euclidean wormhole with two asymptotic AdS boundaries coupled by the non-gravitational auxiliary theory. Two different slicings of the microscop ic Euclidean path integral are possible. This corresponds to two slicings o f the Euclidean wormhole\, defining two different Lorentzian spacetimes rel ated by double analytic continuation. The first one is a Big Bang - Big Cru nch FLRW cosmological universe\; the second one is an AdS eternal traversab le wormhole. I will describe the relationship between cosmological observab les and observables in the traversable wormhole geometry. This "slicing dua lity" allows one to probe the cosmological universe using the usual AdS/CFT dictionary even though the cosmology has no asymptotic boundary. Finally\, I will comment on the possibility of having phases of accelerated cosmolog ical expansion driven by time-varying scalar fields. LAST-MODIFIED:20220427T172129Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Stefano Antonini\, UMD TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220503T150000Z DTEND:20220503T160000Z DTSTAMP:20220808T214455Z UID:56roaeh2u0oa8h36h5bve6v1ai@google.com CREATED:20220207T182538Z DESCRIPTION:Speaker: Dr. Karen Fleming\, Johns Hopkins University

Title: SurA is a Groove-y Chaperone that Expands Unfolded Outer Mem brane Proteins

Abstract: https://chem.umd.edu/events/speaker-karen-fleming< /span> LAST-MODIFIED:20220427T164639Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220427T183000Z DTEND:20220427T193000Z DTSTAMP:20220808T214455Z UID:5oevucqa0j4p8gl45660sj7dcc@google.com CREATED:20220427T155644Z DESCRIPTION:Speaker: Stefano Antonini\, UMD

Title: Slicing duality and holographic cosmology

Abstract: I will outline a re cent proposal (https://arxiv.org /abs/2203.11220) for a holographic description of cosmological s pacetimes with negative cosmological constant in AdS/CFT correspondence. Th e microscopic Euclidean theory has a double reflection symmetry and involve s two 3D holographic CFTs coupled by non-holographic auxiliary 4D degrees o f freedom on a strip. The bulk dual Euclidean path integral is dominated by a 4D Euclidean wormhole with two asymptotic AdS boundaries coupled by the non-gravitational auxiliary theory. Two different slicings of the microscop ic Euclidean path integral are possible. This corresponds to two slicings o f the Euclidean wormhole\, defining two different Lorentzian spacetimes rel ated by double analytic continuation. The first one is a Big Bang - Big Cru nch FLRW cosmological universe\; the second one is an AdS eternal traversab le wormhole. I will describe the relationship between cosmological observab les and observables in the traversable wormhole geometry. This "slicing dua lity" allows one to probe the cosmological universe using the usual AdS/CFT dictionary even though the cosmology has no asymptotic boundary. Finally\, I will comment on the possibility of having phases of accelerated cosmolog ical expansion driven by time-varying scalar fields.
LAST-MODIFIED:20220427T155644Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220506T170000Z DTEND:20220506T174500Z DTSTAMP:20220808T214455Z UID:3d9fk4kmteuuu2coh8le2379b2@google.com CREATED:20220426T182409Z DESCRIPTION:Title: A semidefinite programming based approach to near-term quantum advantage and device certification\nSpeaker: Kishor Bharti (QuICS) \nTime: Friday\, May 6\, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Vi a Zoom: https://umd.zoom.us/j/96160177762 \n\nSemidefinite Programming (SDP) is a class of convex optimization pr ograms with vast applications in control theory\, quantum information\, com binatorial optimization\, machine learning and operational research. In thi s talk\, I will discuss how SDP can be used to address two major challenges in quantum computing research: near-term quantum advantage and device cert ification. Towards the first challenge\, I will discuss how to design noisy intermediate-scale quantum (NISQ) algorithms\, that bypass the local minim a problem\, one of the central problems faced by variational quantum algori thms. As an example\, I will discuss a NISQ eigensolver that does not suffe r from any trainability problem\, such as the barren plateau or local minim a problem. In the second part of the talk\, I will discuss how can one use SDPs to give theoretical guarantees regarding the inner functioning of quan tum devices under minimal assumptions. In particular\, I will discuss the s trategies to prove self-testing statements using tools from semidefinite pr ogramming and graph theory.\n\nReferences:\nhttps://arxiv.org/abs/2106.03891\nhttps://journals.aps.org/prl/abstract/10. 1103/PhysRevLett.122.250403\nhttps://journals.aps.org/rmp/abstract/10.1103/RevM odPhys.94.015004\n\n(Pizza and refreshments will be served after the ta lk.) LAST-MODIFIED:20220426T182409Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Kishor Bharti TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220428T150000Z DTEND:20220428T160000Z DTSTAMP:20220808T214455Z UID:72li73qd8e8f1p6fp3s46ejcnr@google.com CREATED:20220207T182344Z DESCRIPTION:Literature Seminar


Speaker: Rita Dill

Title: Micr oencapsulation of Fragrance Molecules in Perfumes and Detergents

Abs tract: \;https://chem.umd.edu/events/literature-seminar-rita-dill LAST-MODIFIED:20220426T142737Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220427T150000Z DTEND:20220427T160000Z DTSTAMP:20220808T214455Z UID:3thghn78cf1p3kn5trquv2rq3k@google.com CREATED:20220207T181143Z DESCRIPTION:Speaker: Dr. Mark Johnson\, Yale University

T itle: Unraveling the Spectral Dynamics of the Air-Water Interface at the Mo lecular Level with Cryogenic Ion Spectroscopy

Abstract: \;https://chem.umd.edu/e vents/speaker-mark-johnson
LAST-MODIFIED:20220426T142642Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220426T150000Z DTEND:20220426T160000Z DTSTAMP:20220808T214455Z UID:7fvlfi2er570r3on9vpaefa4lj@google.com CREATED:20220207T180905Z DESCRIPTION:Speaker: Dr. Linda Columbus\, University of Virginia

Title: Vignettes from Biophysical Investigation of Membranes\, Memb rane Mimics\, and Membrane Proteins: How They Assemble\, Interact\, and Mov e

Abstract: \;https://chem.umd.edu/events/speaker-linda-columbus LAST-MODIFIED:20220426T142325Z LOCATION:IPST Building\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220503T150000Z DTEND:20220503T160000Z DTSTAMP:20220808T214455Z UID:3aclm4v1mr59lgldh18ig4uogj@google.com CREATED:20220426T012318Z DESCRIPTION:Title: \; Shadow sequence estimation: a p rimitive for learning gate set noise
Speaker: \; \;Jonas Helsen (CWI\, Amsterdam)
Time: \; \;Tuesday\, May 3\, 2022 - 11:00am
Location: \; \;ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96025919736 Meeting ID: 960 2591 9736

In this talk I want to introduce shadow sequence estimation. This is a protocol for learning noise in (random) quan tum circuits in a flexible and scalable manner. It arises essentially as a combination of randomised shadow estimation (in the Huang-Kueng-Preskill se nse) and randomised benchmarking\, a time-honoured gate-fidelity estimation protocol. I will introduce the protocol\, sketch the mathematics behind it s correctness and scalability\, and then I will (hopefully) demonstrate its usefulness through several example estimation protocols\, namely unitary o ptimisation\, crosstalk tomography and a robust state shadow estimation pro tocol.

This talk is based on arXiv: 2110.13178.

(Please note the change to the date of this seminar.)
LAST-MODIFIED:20220426T012401Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/96025919736 Meeting ID: 960 2591 9736 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Jonas Helsen TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220509T180000Z DTEND:20220509T190000Z DTSTAMP:20220808T214455Z UID:575jqvm04al9l69fptksq3ba2c@google.com CREATED:20220426T011302Z DESCRIPTION:Title: Topological order and error correction on fractal geome tries: fractal surface codes\nSpeaker: Arpit Dua (Caltech)\nTime: Monday\ , May 9\, 2022 - 2:00pm\nLocation: ATL 3100A and Virtual Via Zoom: https://um d.zoom.us/j/2821742741?pwd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09\n\nIn this talk\, I will focus on topological order and error correction on fractal ge ometries. Firstly\, I will present a no-go theorem that Z_N topological or der cannot survive on any fractal embedded in two spatial dimensions and th en show that for fractal lattice models embedded in 3D or higher spatial di mensions\, Z_N topological order survives if the boundaries on the holes co ndense only loop or membrane excitations. Next\, I will discuss fault-tole rant logical gates in the Z_2 version of these fractal models\, which we na me as fractal surface codes\, using their connection to global and higher-f orm topological symmetries. In the second half of the talk\, I will discuss the performance of such fractal surface codes as fault-tolerant quantum me mories. I will discuss decoding strategies with provably non-zero threshold s for bit-flip and phase-flip errors in the fractal surface codes with Haus dorff dimension 2+\\epsilon. In particular\, I will describe the adaptation of the sweep decoder to fractal lattices which maintains its self-correcti ng and single-shot nature and state the code performance of a particular fr actal surface code with Haussdorff dimension 2.966. I will summarize with s ome exciting ongoing directions. LAST-MODIFIED:20220426T011302Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/2821742741?p wd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Arpit Dua TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220505T150000Z DTEND:20220505T160000Z DTSTAMP:20220808T214455Z UID:7l81bu9e4k6mhqp0nbljn90nil@google.com CREATED:20220207T183138Z DESCRIPTION:Speaker: Dr. Binghe Wang\, Georgia State University< br>
Title: \;Defying Conventional Wisdom: Developing Carbon Monoxide as a Therapeutic Agent

Abstract: \;
Nitric oxide\, h ydrogen sulfide and carbon monoxide are all toxic molecules\,
and yet th ey belong to the gasotransmitter family of signaling molecules with importa nce
on par with that of neurotransmitters and hormone molecules. Studies have shown that
these endogenously produced molecules have a wide range of physiologic roles and
therapeutic potentials. Specific functions of these molecules are of course unique for each
of them. While the use of NO-producing molecules as therapeutics has long been
established\, the e xploration of hydrogen sulfide and carbon monoxide as therapeutics is
st ill at its infancy at best. This presentation will discuss issues related t o developing
carbon monoxide-based therapeutics as well as CO prodrugs d eveloped in our lab. LAST-MODIFIED:20220425T142314Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220428T180000Z DTEND:20220428T193000Z DTSTAMP:20220808T214455Z UID:31sta6pspaa6kn43rpaqqbnajq@google.com CREATED:20220419T172130Z DESCRIPTION:

Title: How material and design of super conducting qubits affect quasiparticles

Cihan Kurter\, IBM Quantu m\, T. J. Watson Research Center\, Yorktown Heights NY\, United States.

Abstract: \;Elementary excitations of the superconducting con densate known as quasiparticles are major sources of dissipation in superco nducting qubits. When a quasiparticle tunnels across the Josephson junction (JJ) of a qubit circuit\, there is a possibility of exchanging energy with the qubit\, leading to a total decoherence. In this talk\, I will mainly f ocus on the impact of intrinsic habitat of two-dimensional\, fixed frequenc y transmon qubits such as shunting capacitor material or design on the quas iparticle dynamics. I will also present our recent results on temperature d ependence of quasiparticle tunneling rate to discuss how quasiparticles res pond to high transmission sites/defects within the oxide barriers of the JJ s. Our results demonstrate a unique in situ characterization tool to assess the uniformity of tunnel barriers in qubit junctions and shed light on how quasiparticles can interact with various elements of the qubit circuit.


Host: Palmer \;

1

Seminar on Zoom
Meeting&n bsp\;Link: \; \;http s://umd.zoom.us/j/91301075848
LAST-MODIFIED:20220424T163408Z LOCATION:ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Cihan Kurter\, IBM Quantum TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220428T180000Z DTEND:20220428T190000Z DTSTAMP:20220808T214455Z UID:7tn49qitnqk34h2v43968r1gua@google.com CREATED:20220424T150606Z DESCRIPTION:Title: Interactive Proofs for Synthesizing Quantum States and U nitaries\nSpeaker: Gregory Rosenthal (University of Toronto)\nTime: Thursda y\, April 28\, 2022 - 2:00pm\nLocation: Virtual Via Zoom: https://uwa terloo.zoom.us/j/92541289425?pwd=bDVWYTZBTXpDSE1XMFloMEtLYXJiUT09\n\nWh ereas quantum complexity theory has traditionally been concerned with probl ems arising from classical complexity theory (such as computing boolean fun ctions)\, it also makes sense to study the complexity of inherently quantum operations such as constructing quantum states or performing unitary trans formations. With this motivation\, we define models of interactive proofs f or synthesizing quantum states and unitaries\, where a polynomial-time quan tum verifier interacts with an untrusted quantum prover\, and a verifier wh o accepts also outputs an approximation of the target state (for the state synthesis problem) or the result of the target unitary applied to the input state (for the unitary synthesis problem)\; furthermore there should exist an "\;honest"\; prover which the verifier accepts with probability 1. Our main result is a "\;state synthesis"\; analogue of the inc lusion 𝖯𝖲𝖯𝖠𝖢𝖤⊆𝖨𝖯: any sequence of states computable by a polynomial -space quantum algorithm (which may run for exponential time) admits an int eractive protocol of the form described above. Leveraging this state synthe sis protocol\, we also give a unitary synthesis protocol for polynomial spa ce-computable unitaries that act nontrivially on only a polynomial-dimensio nal subspace. We obtain analogous results in the setting with multiple enta ngled provers as well. Based on joint work with Henry Yuen.\n\n(In person viewing at 3100A Atlantic Building) LAST-MODIFIED:20220424T150606Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/92541289425?pwd=bDV WYTZBTXpDSE1XMFloMEtLYXJiUT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Gregory Rosenthal TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220427T193000Z DTEND:20220427T203000Z DTSTAMP:20220808T214455Z UID:3o96rip2q9gvpp583e7ur3mq3s@google.com CREATED:20220421T211655Z DESCRIPTION:
Quantum Characterization and Control: Theory\, Practice and Potential
 \;
Jonathan L DuBois\, Ph. D. will present an overview of some recent work from Quantum Coherent Device Physics Group foc used on open and closed-loop feedback control of superconducting qubits.
 \;
Bio: \;Dr. DuBois received a PhD in computati onal condensed matter theory in 2003 from the University of Delaware. His r esearch interests range from Computational condensed matter physics and qua ntum systems architecture and application co-design to quantum optimal cont rol and hybrid quantum-classical algorithm development. He currently leads the Quantum Coherent Device Physics Group at Lawrence Livermore National La b.
 \;

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LAST-MODIFIED:20220421T211655Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS 2021-22 Seminar Series: Dr. Jonathan Dubois on Quantum Characte rization and Control: Theory\, Practice and Potential TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220427T150000Z DTEND:20220427T160000Z DTSTAMP:20220808T214455Z UID:1bd0a63n1fbqir704hd3icrgsj@google.com CREATED:20220207T164018Z DESCRIPTION:Speaker: Professor Mark Johnson\, Yale University - \;https://jlab.chem .yale.edu/

Title: Unraveling the Spectral Dynamics of the Air-Wa ter Interface at the Molecular Level with Cryogenic Ion Spectroscopy

Abstract: \;The coupling between ambient ionizati on sources\, developed for mass
spectrometric analysis of biomolecules\, and cryogenic ion processing\, originally
designed to study interstella r chemistry\, creates a new and general way to capture
transient chemica l species and elucidate their structures with optical

spectroscopies . Advances in non-linear optics over the past decade allow single-
inves tigator\, table top lasers to access radiation from 550 cm-1 in the infrare d to the

vacuum ultraviolet. When spectra are acquired using prediss ociation of weakly
bound rare gas “tags\,” the resulting patterns are di rectly equivalent to absorption
spectra of target ions at temperatures b elow 10 K\, and quenched close to their
global minimum energy geometries . Taken together\, what emerges is a new and
powerful structural capabil ity that augments the traditional tools available in high
resolution mas s spectrometry. Currently\, these methods are being exploited to
monitor chemical and physical processes in assemblies with well-defined
tempera tures and compositions. Recent applications\, ranging from the mechanismsof small molecule activation by homogeneous catalysts to the microscopic< br>mechanics underlying the ultrafast spectral diffusion in water\, emphasi ze the
generality and utility of the methods in contemporary chemistry.< /html-blob> LAST-MODIFIED:20220421T133640Z LOCATION:On Zoom! go.umd.edu/pchem-Johnson SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220426T171500Z DTEND:20220426T181500Z DTSTAMP:20220808T214455Z UID:153msr0tetdpc270pkovs464ua@google.com CREATED:20220207T155526Z DESCRIPTION:Speaker: Professor Silvina Matysiak\, UMD

Title: Effect of Physiological Environment on Neurodegenerative Peptide Aggregation

Abstract: \;Molecular-level self-assembly/ag gregation processes are common in biomolecular systems. Specifically\, pept ide aggregation results in the formation of biomolecular deposits (amyloid) \, which has been associated with neuronal dysfunction leading up to neurod egeneration. Peptide aggregation is often influenced by several environment -derived entities\, which can modulate this pathological process in a speci fic or non-specific manner. In this talk\, I will present on the molecular mechanism of how the environment modulates amyloid aggregation with biomole cular simulations. To study this process at long spatial and temporal scale s\, we created and applied computational models at coarse-grained (CG) reso lution. Our CG models can capture the biophysics of environment-stimulated conformational transitions that are common with neurodegenerative peptides.  \;Experimentally it has been observed that lipid membrane surfaces\,&n bsp\;hyperglycemic conditions \;and components of the extracellular mat rix can modulate in different ways amyloid formation and the aggregate morp hology. In this presentation\, I will describe the molecular mechanism of h ow crowding\, membrane curvature\, peptide-lipid and peptide-polysaccharide /monosaccharides interactions tune the emergence of different amyloid peptide aggregation kinetics and morphologies.


LAST-MODIFIED:20220421T125632Z LOCATION:IPST Building 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220421T163000Z DTEND:20220421T173000Z DTSTAMP:20220808T214455Z UID:376r0g12f38c6slmqt53fusrrh@google.com CREATED:20220412T172938Z DESCRIPTION:Seminar will be conducted via zoom.

Sp eaker: \;Marc Illa\, IQus/UW

Title: Using Quantum Annealers t o Simulate Standard Model Physics

Abstract: While universal quan tum computation is essential in the quest to simulate Standard Model physic s\, the near-term devices that define the NISQ era\, without high-fidelity qubits and error correction\, will be challenged to provide results that ca n be quantitatively compared with experiment. Much of the current research in this area is performed on gate-based quantum computers\, and the alterna tive\, adiabatic quantum computing\, has not been explored with as much det ail. We explore the potential of D-Wave’s quantum annealers for computing b asic components required for quantum simulations of Standard Model physics\ , such as the study harmonic and anharmonic oscillators relevant for lattic e scalar field theories and effective field theories\, the time evolution o f a single plaquette of SU(3) Yang-Mills lattice gauge field theory\, and t he dynamics of flavor entanglement in four neutrino systems.
LAST-MODIFIED:20220420T200333Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220429T170000Z DTEND:20220429T174500Z DTSTAMP:20220808T214455Z UID:02opiheresgnbv9ktrfgs88m6a@google.com CREATED:20220420T164836Z DESCRIPTION:Title: Optical conductivity and orbital magnetization of Floqu et vortex states\nSpeaker: Iman Ahmadabadi (JQI)\nTime: Friday\, April 29 \, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762\n\nMotivated by re cent experimental demonstrations of Floquet topological insulators\, there have been several theoretical proposals for using structured light\, either spatial or spectral\, to create other properties such as flat band and vor tex states. In particular\, the generation of vortex states in a massive Di rac fermion insulator irradiated by light carrying nonzero orbital angular momentum (OAM) has been proposed recently. Here\, we evaluate the orbital m agnetization and optical conductivity as physical observables for such a s ystem. We show that the OAM of light induces nonzero orbital magnetization and current density. The orbital magnetization density increases linearly as a function of OAM degree\, and non-linearly as a function of the frequen cy of the light field. In certain regimes\, we find that orbital magnetizat ion density is independent of the system size\, width\, and Rabi frequency of light. Furthermore\, we study the optical conductivity for various types of electron transitions between different states such as vortex\, edge\, a nd bulk that present in the system. Based on conductance frequency peaks\, a scheme for the detection of vortex states is proposed.\n\n(Pizza and refr eshments will be served after the talk.) LAST-MODIFIED:20220420T164836Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Iman Ahmadabadi TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220420T150000Z DTEND:20220420T160000Z DTSTAMP:20220808T214455Z UID:55bmob7701nfn1j7scbkneinob@google.com CREATED:20220207T163948Z DESCRIPTION: LAST-MODIFIED:20220418T210908Z LOCATION:IPST Building 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220422T170000Z DTEND:20220422T174500Z DTSTAMP:20220808T214455Z UID:5gc0e9bgoahju3ro6gi2hnap7e@google.com CREATED:20220417T003741Z DESCRIPTION:Title: Atomic frequency combs for broadband quantum memory\nSp eaker: Aditya Sharma (JQI)\nTime: Friday\, April 22\, 2022 - 1:00pm\nLoca tion: ATL 2324 and Virtual Via Zoom: htt ps://umd.zoom.us/j/96160177762\n\nQuantum memory will play an important role in quantum networks\, notably as components in quantum repeaters. One promising technique for realizing broadband quantum memory\, the atomic fr equency comb (AFC) protocol\, calls for a material with large inhomogeneous broadening and small homogeneous broadening: spectral-hole burning techniq ues can be used to prepare the absorption spectrum in a periodic pattern of narrow peaks (an AFC). A single photon\, absorbed as a collective excitati on\, will be re-emitted after a time interval fixed by the AFC tooth spacin g. On-demand retrieval can also be realized by using control pulses to impl ement spin-wave storage.\n\nRare-earth-doped crystals like Pr3+:Y2SiO5 are well-suited to the AFC protocol. However\, in many cases the materials have hyperfine structure that limits AFC bandwidth. Here\, we present an experi ment showing that it is possible to work within these constraints to genera te broadband AFCs.\n\n(Pizza and refreshments will be served after the talk .) LAST-MODIFIED:20220417T014229Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Aditya Sharma TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220422T173000Z DTEND:20220422T183000Z DTSTAMP:20220808T214455Z UID:63ah2p3mqbcl5088jhco59e3i7@google.com CREATED:20220124T181408Z DESCRIPTION:Preceded by virtual lunch at 12:30pm.

Speaker: Maxim Pospelov\, University of Minnesota-

Title: Standard M odel and EDMs

Abstract: I review the main mechanisms that convert fu ndamental CP-violating parameters (theta_QCD and
Kobayashi-Maskawa phas e) to the observable electric dipole moments (EDMs). In light of recent exp erimental progress\, the
EDMs connected to electron spin (paramagnetic EDMs) are calculated. The limit on QCD theta angle is 3 * 10^(-8) and
s omewhat subdominant to neutron EDM\, but can be improved. The Kobayashi-Mas kawa phase contributes to paramagnetic EDMs at the
level of 10^{-35} e cm in units of equivalent electron EDM\, which is much larger than what was previously estimated. \; \;


LAST-MODIFIED:20220415T174231Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special Joint Cornell/UMD Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220418T190000Z DTEND:20220418T203000Z DTSTAMP:20220808T214455Z UID:5jdkuq6dd2sd093i797tfh1b7m@google.com CREATED:20220119T153446Z DESCRIPTION:Seminar will be conducted via zoom.

Speaker: Prateek Agrawal\, Oxford


Title: Avoided Deconfinem ent in Randall-Sundrum \;models

Abstract: Early universe phase t ransitions in RS models are interesting from a theoretical as well as an ob servational viewpoint. They are dual to first-order confinement transitions in large-N gauge theories and are a prime target for stochastic gravitatio nal wave signals. The transition rate to the confined phase is suppressed b y exp(−N^2) and does not complete for parametrically large N\, in significa nt tension with calculability in RS. I will present a mechanism which stabi lizes the IR brane such that the theory avoids \;deconfinement at high temperature and stays in the confined phase at all times after inflation an d reheating. \; Early universe phenomena such as WIMP freeze-out\, axio n abundance\, baryogenesis and gravitational wave signatures are qualitativ ely modified.
For zoom link please email mknouse@umd.edu
LAST-MODIFIED:20220415T173027Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220419T171500Z DTEND:20220419T181500Z DTSTAMP:20220808T214455Z UID:3b3u2vt5kmom00k2vpq481mps9@google.com CREATED:20220207T155451Z DESCRIPTION:Speaker: Professor Jindal Shah\, Oklahoma Sta te University

Title: What Does Non-Ideality Mean for Binary Ionic Li quid Mixtures?

Abstract: \;Ionic liquids aresubsta nces that are composed entirely of ions. Negligible vapor pressures andthe availability of a large number of cations and anions to tunephysicochemical and biological properties for a given chemical process havebeen the primar y drivers for research in this field over the last two and half  \;deca des. A major thrust of theseinvestigations is on elucidating changes in the properties of pure ionicliquids by altering the cation\, anion or substitu ents on the ions. Anotherapproach to expand the range of available ionic li quids is to form ionicliquid-ionic liquid mixtures. From a thermodynamic po int of view\, the knowledgeof the extent of non-ideality in these binary io nic liquid mixtures and themolecular level details enable a prioripr ediction of thermophysical properties of ionic liquid mixture. In thisprese ntation\, we will demonstrate that the difference in the molar volume ofthe ionic liquids forming the mixture and the difference in the hydrogenbondin g ability of the anions can serve as metrics for the prediction ofnon-ideal ity in the binary ionic liquid systems. Such non-idealities appear inthe fo rm local structural organization of anions around the cation in ionicliquid mixtures bearing a common cation and two different anions. We willfurther highlight that these non-native structures lead to a different dissolutionm echanism for CO2 in mixtures in comparison to that for pure ioni cliquids although the CO2 solubilities obey apparent ideal mixin grule.


LAST-MODIFIED:20220414T210306Z LOCATION:https://go.umd.edu/statphys_zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220421T180000Z DTEND:20220421T193000Z DTSTAMP:20220808T214455Z UID:1bupt7e9n22nu75d5fuf20lc8m@google.com CREATED:20220414T181949Z DESCRIPTION:

Title: Disorder in topological semimetals: insights from epi taxy \;

Abstract: Topological semimetals\, characterized by linea r band touching nodes near the Fermi level\, exhibit remarkable band struct ure and transport phenomena. While such phenomena have largely been discove red and studied in bulk crystals\, epitaxial layers will ultimately be requ ired to realize devices. We must therefore understand and control the impac t of disorder occurring in epitaxial material\, including point and extende d defects and interfaces. In this talk\, I will discuss our work to this en d in the prototypical Dirac semimetal Cd3As2. Drawing on decades of collective knowledge of disorder regulation in conventional semiconductors\, we use molecular beam epitaxy on zinc blende substrates to select the crystallographic orientation of the epilayer\, systematically v ary point defect populations and synthesize alloys. These factors offer rou tes to tune the electron concentration and mobility and allow us to probe h ow defects impact magneto transport behavior. I will also discuss the imple mentation of double heterostructures to enable new vertical photodetector d esigns and other future devices.


Host: Paglione
 \;
Locati on: Toll Physics Rm 1201

Seminar also on Zoom
Meeting \;Link:  \; \;https://umd.zo om.us/j/91301075848 LAST-MODIFIED:20220414T182150Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Kirstin Alberi\, NREL TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220421T180000Z DTEND:20220421T190000Z DTSTAMP:20220808T214455Z UID:25jk8hqm16vpkr33716p8kdsm3@google.com CREATED:20220413T160759Z DESCRIPTION:Title: Universal efficient compilation: Solovay-Kitaev without inverses\nSpeaker: Tudor Giurgica-Tiron (Stanford University)\nTime: Thu rsday\, April 21\, 2022 - 2:00pm\nLocation: Virtual Via Zoom: https:// uwaterloo.zoom.us/j/93303967968?pwd=bm9VWjkwRGZTUjVOTkptekhleHdsZz09\n\ nThe Solovay-Kitaev algorithm is a fundamental result in quantum computatio n. It gives an algorithm for efficiently compiling arbitrary unitaries usin g universal gate sets: any unitary can be approximated by short gates seque nces\, whose length scales merely poly-logarithmically with accuracy. As a consequence\, the choice of gate set is typically unimportant in quantum co mputing. However\, the Solovay-Kitaev algorithm requires the gate set to be inverse-closed. It has been a longstanding open question if efficient algo rithmic compilation is possible without this condition. In this work\, we p rovide the first inverse-free Solovay-Kitaev algorithm\, which makes no ass umption on the structure within a gate set beyond universality\, answering this problem in the affirmative\, and providing an efficient compilation al gorithm in the absence of inverses for both the special unitary\, and the s pecial linear groups in arbitrary dimension. The algorithm works by showing that approximate gate implementations of the generalized Pauli group can s elf-correct their errors. Arxiv: 2112.02040. LAST-MODIFIED:20220413T160759Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/93303967968?pwd=bm9V WjkwRGZTUjVOTkptekhleHdsZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Tudor Giurgica-Tiron TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220419T160000 DTEND;TZID=America/New_York:20220419T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu_R20220215T210000@google.com RECURRENCE-ID;TZID=America/New_York:20220419T160000 CREATED:20200116T204737Z DESCRIPTION:John Carlstrom\, University of Chicago

Cosmic Microwave Background Status and Future Promise
This talk will briefly review what we have learned from the CMB\, the current state o f the art\, and its future discovery potential.

Host: Drew Baden LAST-MODIFIED:20220413T134920Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220414T163000Z DTEND:20220414T173000Z DTSTAMP:20220808T214455Z UID:2mu12tuh6oud7ht1kntrhlpqck@google.com CREATED:20220413T133928Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoom.us/j/94067 038750

Speaker: \;Christian Drischler\, MSU/FRIB

Title : Nuclear matter from chiral effective field theory with quantified uncerta inties

Abstract: Recent advances in neutron star observations have the potential to provide novel insights into strongly interacting matt er at high densities. On the other hand\, chiral effective theory has devel oped into a powerful framework for studying nuclear matter properties up to intermediate densities with theoretical uncertainties quantified. In this talk\, I will discuss some of the recent developments in microscopic nuclea r matter calculations with chiral two- and three-nucleon interactions and B ayesian uncertainty quantification. Constraints on the nuclear symmetry ene rgy and its density dependence will be discussed in detail. I will also dem onstrate how effective field theory enables statistically meaningful compar isons among competing nuclear theory predictions\, and experimental and obs ervational constraints on the equation of state in the era of multimessenge r astronomy.

LAST-MODIFIED:20220413T133928Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220426T160000 DTEND;TZID=America/New_York:20220426T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu_R20220215T210000@google.com RECURRENCE-ID;TZID=America/New_York:20220426T160000 CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220413T130745Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:No Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220413T180000Z DTEND:20220413T190000Z DTSTAMP:20220808T214455Z UID:2ek0cfldp777316535gfrbt93i@google.com CREATED:20220412T140936Z DESCRIPTION:Speaker: \; Chris Laumann (Boston University)

Where: ATL 4402

Title: \;Entanglement with Constr aints in Many-Body Systems

Abstract: Over the last several de cades\, entanglement has emerged as a unifying lens for understanding pheno mena across many areas in quantum physics. At low energy\, the structure of ground state entanglement reflects universal features of the phase of matt er. At high energy\, the growth of entanglement underlies thermalization an d the emergence of statistical mechanics. In this talk\, I will describe tw o recent exact results characterizing entanglement in many-body systems.

First\, we will consider the entanglement entropy in momentum space of translation-invariant Fermi liquids and superconductors. By developing a n on-perturbative expansion in the k-space volume of the partition\, we will discover a universal function of low energy parameters hiding in the entrop y.

Second\, we will consider how Hilbert space constraints\, arising from symmetry or local rules\, change the typical entanglement of random p ure states. By an exact diagrammatic approach\, I will compute entanglement spectra. The singularities in these spectra naturally organize constraints and symmetries into "phases". \;

Host: Dr. Jay Sau LAST-MODIFIED:20220412T141023Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Quantum Science and Information Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220421T150000Z DTEND:20220421T160000Z DTSTAMP:20220808T214455Z UID:76miu1n0vl1utgtlsb8kt0n59q@google.com CREATED:20220207T180723Z DESCRIPTION:Speaker: Dr. Nicole L. Snyder\, Davidson College

Title: Humans vs Microbes

Abstract: \;https://che m.umd.edu/events/humans-vs-microbes
LAST-MODIFIED:20220411T140044Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220420T180000Z DTEND:20220420T193000Z DTSTAMP:20220808T214455Z UID:2daiv6c4sh813p4bj5cari714v@google.com CREATED:20220411T131832Z DESCRIPTION:*Special Joint Gravity-Particle Theory Semina r*-

Speaker: \;Edgar Shaghoulian\, U of Pennsylvania

Tit le: The central dogma and entanglement in de Sitter space

Abstract: The central dogma of black hole physics – which says that from the outside a black hole can be described in terms of a quantum system with exp(Area/4 G) states evolving unitarily – has recently been supported by computations indicating that the interior of the black hole is encoded in the Hawking ra diation of the exterior. In this paper\, we probe whether such a dogma for cosmological horizons has any support from similar computations. The fact t hat the de Sitter bifurcation surface is a minimax surface (instead of a ma ximin surface in the case of black holes) causes problems with this interpr etation when trying to import calculations analogous to the AdS case. This suggests placing the holographic dual on the de Sitter horizon itself\, whe re we formulate a two-sided extremization prescription for computing entang lement entropy in the holographic dual. We find answers consistent with gen eral expectations for a quantum theory of de Sitter space\, including a van ishing total entropy and an entropy of A/4G when restricting to a single st atic patch. We will also explore some of its more exotic predictions.
LAST-MODIFIED:20220411T131832Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint Gravity-Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220415T190000Z DTEND:20220415T200000Z DTSTAMP:20220808T214455Z UID:3ecmcunndvr6nslhg06ovrma0l@google.com CREATED:20220411T124235Z DESCRIPTION:Two 30 minutes talks.

Speaker: Dr. Leo Singer (GSFC)

Title: "Capturing Neutron S tar Mergers from the Ground and Space"

Neutron star binary mergers a re powerful and distinctive sources of gravitational waves but also leave b ehind broadband electromagnetic radiation in the form of gamma-ray bursts\, afterglows\, and kilonovae. Multimessenger observations of them can be rem arkably illuminating in topics from fundamental physics to cosmology to nuc leosynthesis. To date\, LIGO and Virgo have detected several neutron star m ergers\, one with an exceptionally bright and well-studied electromagnetic counterpart. Electromagnetic follow-up of gravitational-wave sources is hig hly rewarding but also highly challenging because telescopes may have only hours to scan over the LIGO/Virgo/KAGRA localization before the blast redde ns and fades beyond detectability. I will discuss several interconnected to pics related to observing neutron star mergers from the ground and space: g round-based kilonova searches with the Zwicky Transient Facility\, a propos ed NASA mission for rapid ultraviolet observations of mergers\, next-genera tion algorithms and software to optimally coordinate follow-up with network s of telescopes\, and what to expect from the upcoming observing run of LIG O\, Virgo\, and KAGRA.


Speaker: Dr. Scott Noble (GSFC)
Title: "Accretion Dynamics of Massive Binary Black Holes"
Supermassive binary black holes in gaseous environments are key multi-messenger sources for the LISA mission and pulsar timing arrays. Simulating these systems realistica lly is challenging as radiation-coupled magnetohydrodynamics (MHD) must be considered over large dynamic ranges in space and time. We will provide a b rief summary of the progress made in our group to understand these systems theoretically using high-performance simulations of general relativistic MH D and dynamic spacetimes. In order to cover a larger temporal range in one set of simulations\, we constrain our view to the circumbinary disk region and measure how the evolution duration\, accretion disk size\, and mass rat io have on the structure and variability of the accretion flow. We particul arly emphasize how these parameters influence the over-density feature\, or "lump"\, which orbits the binary near the edge of the cavity\, since it is responsible for most of the electromagnetic emission's variability---a key signature of a system being a binary. Extending to smaller length scales\ , we will report on simulations following accretion all the down to the eve nt horizons so that we may begin to investigate how black hole spin affects mini-disk dynamics\, accretion rate\, and jet power. We will conclude by r eporting on our radiative transfer predictions for how black hole spin alte rs the spectral energy distribution of these systems.

Refreshments and discussion before the talks
LAST-MODIFIED:20220411T124257Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220420T163000Z DTEND:20220420T173000Z DTSTAMP:20220808T214455Z UID:67cnrn3qlcf5e74u9iltd01n7a@google.com CREATED:20220410T214922Z DESCRIPTION:Title:  Saturation and recurrence of quantum complexity in random quantum circuits
Speaker:  Michal Oszmaniec (Quantum Informati on Research Group)
Time:  Wednesday\, April 20\, 2022 - 12:30pm
Locat ion:  Virtual Via Zoom: https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4a FdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc123

Quantum complexity is a measure of the minimal number of elementary operations required to approximately prepare a given state or unitary chan nel. Recently this concept has found applications beyond quantum computing- --in the classification of topological phases of matter and in the descript ion of chaotic many-body systems. Furthermore\, within the context of the A dS/CFT correspondence\, it has been postulated that the complexity of a spe cific time-evolved many-body quantum state is sensitive to the long-time pr operties of AdS-black hole interiors. In this context Brown and Susskind co njectured that the complexity of a chaotic quantum system grows linearly in time up to times exponential in the system size\, saturating at a maximal value\, and remaining maximally complex until undergoing recurrences at the doubly-exponential times. In this work we prove the saturation and recurre nce of complexity of quantum states and unitaries in a model of chaotic tim e-evolution based on local random quantum circuits\, in which a local rando m unitary transformation is applied to the system at every time step. Impor tantly\, our findings do not depend on details of the model of random circu its\, such as geometry of interactions between the qubits.  Our results adv ance an understanding of the long-time behaviour of chaotic quantum systems and could shed light on the physics of black hole interiors.  From a techn ical perspective our results are based on establishing new quantitative con nections between the Haar measure and high-degree approximate designs\, as well as the fact that random quantum circuits of sufficiently high depth co nverge to approximate designs.

The talk is based on joint work with Nicolas Hunter-Jones and Michał Horodecki.  

(Please note the later start time of 12:30 p.m. for this seminar.)

(In person viewing at 31 00A Atlantic Building)

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LAST-MODIFIED:20220410T214922Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3F Cblk4aFdTMjkzTllvQT09 Meeting ID: 989 367 6372 Passcode: abc123 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Michal Oszmaniec TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220418T150000Z DTEND:20220418T160000Z DTSTAMP:20220808T214455Z UID:0naetl7tl8lq8bcs9q9aamh90m@google.com CREATED:20220410T022724Z DESCRIPTION:Title: Repeated Quantum Error Correction in a Distance-Three S urface Code with Superconducting Circuits\nSpeaker: Andreas Wallraff (ETH Zürich)\nTime: Monday\, April 18\, 2022 - 11:00am\nLocation: ATL 2400\, V irtual Via Zoom: https://umd.zoom.us/j/91508910194?pwd=RXlQU2YyMUhyUUtGSlI5Nn RCbm9xdz09 Meeting ID: 915 0891 0194 Passcode: 617935\, Live stream on YouTube: https://www.youtube.com/user/ JQInews\n\nQuantum computers hold the promise of solving computational problems which are intractable using conventional methods. For fault-tolera nt operation quantum computers must correct errors occurring due to unavoid able decoherence and limited control accuracy. Here\, we demonstrate quantu m error correction using the surface code\, which is known for its exceptio nally high tolerance to errors. Using 17 physical qubits in a superconducti ng circuit we encode quantum information in a distance-three logical qubit building up on recent distance-two error detection experiments [1]. In an e rror correction cycle taking only 1.1 µs\, we demonstrate the preservation of four cardinal states of the logical qubit [2]. Repeatedly executing the cycle\, we measure and decode both bit- and phase-flip error syndromes usin g a minimum-weight perfect-matching algorithm in an error-model-free approa ch and apply corrections in postprocessing. We find a low logical error pro bability of 3 % per cycle when rejecting experimental runs in which leakage is detected. The measured characteristics of our device agree well with a numerical model. Our demonstration of repeated\, fast\, and high-performanc e quantum error correction cycles\, together with recent advances in ion tr aps\, support our understanding that fault-tolerant quantum computation wil l be practically realizable.\n[1] C. Kraglund Andersen et al.\, Nature Phys ics 16\, 875–880 (2020)\n[2] S. Krinner\, N. Lacroix et al.\, arXiv:2112.03 708 (2021)\n\n(Work done in collaboration with Sebastian Krinner\, Nathan L acroix\, Ants Remm\, Agustin Di Paolo\, Elie Genois\, Catherine Leroux\, Ch ristoph Hellings\, Stefania Lazar\, Francois Swiadek\, Johannes Herrmann\, Graham J. Norris\, Christian Kraglund Andersen\, Markus Müller\, Alexandre Blais\, Christopher Eichler\, and Andreas Wallraff)\n\nhttps://umd.zoom.us/j/ 91508910194?pwd=RXlQU2YyMUhyUUtGSlI5NnRCbm9xdz09\n\nMeeting ID: 915 089 1 0194\nPasscode: 617935\nFind your local dial-in number: https://umd.zoom.us/u/adMcss99z\n\nUniversity of Marylan d affiliates may participate using Zoom. If you have trouble joining the Zo om meeting\, please try logging in first via the UMD Zoom portal (umd.zoom.com). For those without access to Zoom\, this semin ar will also be live streamed on YouTube. Once the seminar starts\, you wil l find a link to the live stream on YouTube page at https://www.youtube.com/user/JQInews. LAST-MODIFIED:20220410T022724Z LOCATION:ATL 2400\, Virtual Via Zoom: https://umd.zoom.us/j/91508910194?pwd =RXlQU2YyMUhyUUtGSlI5NnRCbm9xdz09 Meeting ID: 915 0891 0194 Passcode: 61793 5\, Live stream on YouTube: https://www.youtube.com/user/JQInews SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS Special Seminar: Andreas Wallraff TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220413T150000Z DTEND:20220413T160000Z DTSTAMP:20220808T214455Z UID:27d2cgjg6skt23g2942crqj3nn@google.com CREATED:20220207T163915Z DESCRIPTION:Speaker: Dr. David Long\, NIST - \ ;https://www.nist.gov/peop le/david-long

Title: New Approaches to Optical Spectroscopy: Fro m Satellites to Combs to Microsensors

Abstract: \; I will discuss our recent work towards novel methods for optical spectrosco py. These efforts include a variety ultrasensitive\, cavity-enhanced method s in support of global greenhouse gas remote sensing. In addition\, I will discuss approaches for the generation of optical frequency combs and their use in a wide range of applications including molecular and atomic spectros copy as well as physical metrology. Finally\, I will describe the use of th ese combs to interrogate optomechanical sensors for high accuracy\, chip-sc ale accelerometry.
LAST-MODIFIED:20220407T135513Z LOCATION:IPST Building 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220420T210000Z DTEND:20220420T220000Z DTSTAMP:20220808T214455Z UID:5oklshi682vv731bkoofoftv98@google.com CREATED:20220407T120732Z DESCRIPTION:S. Alan Stern
Associate Vice President of the Space S cience and Engineering Division at Southwest Research Institute® and Princi pal Investigator of NASA's New Horizons Mission to Pluto

Title: In H onor of Professor Mike A'Hearn: The Exploration of Pluto and the Kuiper Bel t

NASA's New Horizons mission\, conceived in 2001 and launched in 20 06\, explored Pluto and its system of moons in 2015 and made the first reco nnaissance flyby of an ancient Kuiper Belt Object in 2019. Stern will descr ibe the project\, its scientific basis and history\, and many of the discov eries made about these frontier worlds so many billions of miles away in sp ace. The talk will be rich in stunning imagery of these newly explored plac es. Stern will also reflect on his professional relationship with Professor A'Hearn throughout his career and point out his many accomplishments.  \;
 \;
A reception outside outside the lecture hall will begin at 4:15 pm.
 \;
For more info: \;https://science.umd.edu/events/ahe arn-2022.html. LAST-MODIFIED:20220407T120732Z LOCATION:Edward St. John Building\, Room 0202 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Inaugural Mike A'Hearn Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220411T190000Z DTEND:20220411T203000Z DTSTAMP:20220808T214455Z UID:2dknhvbtetp9p2qjfssuvsleq2@google.com CREATED:20220120T151047Z DESCRIPTION:Speaker: Nicolás Fernández\, UIUC

Title:
Freeze-in\, glaciation\, and UV sensitivity from light mediators.

Ab stract:
Dark matter (DM) freeze-in through a light mediator is an appeal ing model with excellent detection prospects at current and future experime nts. Light mediator freeze-in is UV-insensitive insofar as most DM is produ ced at late times\, and thus the DM abundance does not depend on the unknow n early evolution of our universe.  \;However the final DM yield retain s a dependency on the initial conditions for the DM abundance\, which is us ually assumed to be exactly zero. We point out that in models with light me diators\, the final DM yield will also depend on the initial conditions ass umed for the light mediator population. We describe a class of scenarios we call “glaciation” where DM freezing in from the SM encounters a pre-existi ng thermal bath of mediators\, and study the dependence of the final DM yie ld on the initial temperature of this dark radiation bath. We quantify the dependence of the DM yield on the initial dark temperature and find that it can be sizeable in regions near the traditional (zero initial abundance) f reeze-in curve.  \;We generalize the freeze-in curve to a glaciation ba nd\, which can extend as much as an order of magnitude below the traditiona l freeze-in direct detection target\, and point out that the DM phase space distribution as well as the yield can be strongly dependent on initial con ditions.
LAST-MODIFIED:20220406T200207Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220411T180000Z DTEND:20220411T190000Z DTSTAMP:20220808T214455Z UID:7bdhgg091evg603fbg266e7b25@google.com CREATED:20220406T181631Z DESCRIPTION:Speaker: \;Anushya Chandran (Boston Unive rsity)

Where: ATL 4402

Title: Quantization of d ynamics in quasi-periodically driven systems

Abstract: In the past decade\, quantum simulators have increased in their power and scope\, offering exquisite dynamical control of tens or even hundreds of individua l atoms. Concurrently\, a topological revolution in our understanding of el ectronic band structures has taken place\, driven by the discovery of topol ogical insulators\, graphene and other topological materials. Remarkably\, these advances can be connected --- the dynamics of driven few level system s can be described using band structures in ``synthetic dimensions\,'' one per driving tone. Topological order in the synthetic band structure then le ads to quantized dynamical responses in the quantum simulator.

In th is talk\, I will use a unifying frequency lattice construction to reveal no nadiabatic topological responses in quasiperiodically driven systems. We wi ll find that quasi-periodically driven qubits already exhibit topologically distinct dynamical phases\, and that a 2-tone driven inhomogenous wire can function as a quantized energy pump at any temperature. The latter system provides one of the few examples of many-body localization protected order that is absolutely stable. I will argue that the quantized energy pumping r egime is accessible in near-term optical and microwave cavity-QED experimen ts\, and that furthermore\, it is useful to prepare highly excited non-clas sical cavity states.



Host: Dr. Jay Sau
LAST-MODIFIED:20220406T181659Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Science and Information Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220411T160000 DTEND;TZID=America/New_York:20220411T173000 DTSTAMP:20220808T214455Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220411T160000 CREATED:20220131T204640Z DESCRIPTION:

Title: Nb3Sn Film Characterization with Nonli near Microwave Response in the Superconducting State

Abstract: The mi croscopic origins of Superconducting Radio Frequency (SRF) cavity breakdown by surface defects are not completely understood. In particular\, a clear indication of which defects are harmful for SRF operation\, and which are n ot\, is important to establish. Here we study Nb3Sn-on-Nb film\, which is a promising material for SRF cavity. To locally study the electro dynamics of superconductors\, a near-field magnetic microwave microscope wa s built. We study the 3rd harmonic response as a function of rf field ampli tude and temperature. We find evidence for 2 superconducting transitions wi th transition temperatures around 6.3 K and 6.7 K\, respectively. One possi ble explanation of such impurities is that they come from stochiometric iss ue of Nb3Sn. Besides the 2 impurity phases\, we also observe a t emperature-independent mechanism of the 3rd harmonic response in weak appli ed field regime. One possibility is early vortex penetration due to high su rface roughness of the sample.



April 11\, 2022& nbsp\;
Monday 4pm
Rm 1201 Toll Physics:

Z oom LInk: \;https://umd. zoom.us/j/97265681008 LAST-MODIFIED:20220406T002410Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Chung-Yang Wang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220412T160000 DTEND;TZID=America/New_York:20220412T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu_R20220215T210000@google.com RECURRENCE-ID;TZID=America/New_York:20220412T160000 CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220405T185407Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:No Physics colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220407T140000Z DTEND:20220407T150000Z DTSTAMP:20220808T214455Z UID:5np2k718crga47t3fbpc8fii5j@google.com CREATED:20220405T174702Z DESCRIPTION:Title: Tuning arrays with rays: Physics-informed tuning of qua ntum dot charge states\nSpeaker: Justyna Zwolak (NIST)\nTime: Thursday\, April 7\, 2022 - 10:00am\nLocation: ATL 3100A and Virtual Via Zoom: https:// umd.zoom.us/j/98334495382?pwd=MVdzczB0dFpVYVRKRU5WWGVQd0pqZz09 Meeting ID: 983 3449 5382 Passcode: 606007\n\nCurrent semiconductor-based quantum c omputing approaches rely upon achieving control of nanocircuits at the sing le-electron level and using them as quantum bits (qubits). Establishing a s table configuration of spins in quantum dot (QD) devices is accomplished by a combination of electrostatic confinement\, bandgap engineering\, and dyn amical control via nearby electrical gates. However\, with an increasing nu mber of QD qubits\, the relevant parameter space grows exponentially\, maki ng heuristic control unfeasible. In semiconductor quantum computing\, devic es now have tens of individual electrostatic and dynamical gate voltages th at must be carefully set to isolate the system to the single-electron regim e and to realize good qubit performance. Large-scale quantum processors hin ge on fully autonomous tuning processes that can be parallelized for practi cal applications.\n\nOver the past decade\, there has been a number of adva nces aimed at automation of the various aspect of tuning QD devices\, from testing device functionality and bootstrapping to setting the device topolo gy to charge tuning. While the initial attempts relied on the appealingly i ntuitive and relatively easy to implement conventional algorithms involving a combination of techniques from regression analysis\, pattern matching\, and quantum control theory\, more recently researchers began to take advant age of the tools provided by the field of artificial intelligence. I will d iscuss how our recently proposed ray-based classification framework (RBC) c an be combined with an “action-based” algorithm to tune a bootstrapped QD d evice into a specific few-electron charge configuration\, paving a path tow ards fully automated QD quits initialization.\n\nJoin Zoom Meeting\nhttps://u md.zoom.us/j/98334495382?pwd=MVdzczB0dFpVYVRKRU5WWGVQd0pqZz09\n\nMeetin g ID: 983 3449 5382\nPasscode: 606007\nOne tap mobile\n+13017158592\,\,9833 4495382#\,\,\,\,*606007# US (Washington DC)\n+13126266799\,\,98334495382#\, \,\,\,*606007# US (Chicago)\n\nDial by your location\n +1 301 715 85 92 US (Washington DC)\n +1 312 626 6799 US (Chicago)\n +1 929 436 2866 US (New York)\n +1 669 900 6833 US (San Jose)\n +1 253 215 8782 US (Tacoma)\n +1 346 248 7799 US (Houston)\nMeeting ID: 983 3449 5382\nPasscode: 606007\nFind your local number: https://umd.zoom.us/u/afsRRoM50\n\nJoin by SIP\n98334495382@zoomcrc.com\n\nJoin by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.1 14.131.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (A msterdam Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\ n64.211.144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada To ronto)\n65.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n14 9.137.24.110 (Japan Osaka)\nMeeting ID: 983 3449 5382\nPasscode: 606007 LAST-MODIFIED:20220405T174702Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/98334495382? pwd=MVdzczB0dFpVYVRKRU5WWGVQd0pqZz09 Meeting ID: 983 3449 5382 Passcode: 60 6007 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Justyna Zwolak TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220415T170000Z DTEND:20220415T174500Z DTSTAMP:20220808T214455Z UID:7ms83d44i3ajnh56mlrhfv1rr3@google.com CREATED:20220405T173503Z DESCRIPTION:Title: Non-equilibrium critical phenomena in a trapped-ion qua ntum simulator\nSpeaker: Arinjoy De (JQI)\nTime: Friday\, April 15\, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762\n\nRecent work has predic ted that quenched near-integrable systems can exhibit dynamics associated w ith thermal\, quantum\, or purely non-equilibrium phase transitions\, depen ding on the initial state [1]. Using a trapped-ion quantum simulator with i ntrinsic long-range interactions\, we investigate collective non-equilibriu m properties of critical fluctuations after quantum quenches. In particular \, we probe the scaling behavior of fluctuations near the critical point of the ground-state disorder-to-order phase transition\, after single and dou ble quenches of the transverse field in a long-range Ising Hamiltonian. Wit h system sizes of up to 50 ions\, we show that both the post-quench fluctua tion magnitude and dynamics scale with system size with distinct critical e xponents\, characterizing the type of phase transition. Furthermore we demo nstrate that the critical exponents after a single and a double quenches ar e different and correspond to effectively thermal and truly non-equilibrium behavior\, respectively. Our results demonstrate the ability of quantum si mulators to explore universal scaling beyond the equilibrium context.\n\n[1 ] Paraj Titum and Mohammad F. Maghrebi\, Phys. Rev. Lett. 125\, 040602 (202 0)\n\n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20220405T173503Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Arinjoy De TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220412T140000Z DTEND:20220412T150000Z DTSTAMP:20220808T214455Z UID:3kouiqhitgm8stm0t66kn8md6a@google.com CREATED:20220405T171230Z DESCRIPTION:Title: A quantum algorithm for thermal state preparation based on nonequilibrium fluctuation theorems\nSpeaker: Yigit Subasi (Los Alamos National Lab)\nTime: Tuesday\, April 12\, 2022 - 10:00am\nLocation: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/91755777057?pwd=Z0U2dDVjRG1 icFBFN1VSbXZmbGtuQT09\n\nNonequilibrium fluctuation theorems provide a correspondence between properties of quantum systems in thermal equilibrium and work distributions arising in nonequilibrium processes. Building upon these theorems\, we present a quantum algorithm to prepare a purification o f the thermal state of a quantum system of interest. Unlike previous algori thms based on a thermalization process that brings an infinite-temperature state to one at finite temperature\, our algorithm assumes access to the pu rification of the thermal state of H0 to prepare a purification of the ther mal state of H1=H0+V at the same temperature. When the perturbation V is sm all\, even with a trivial nonequilibrium process our algorithm provides a s ignificant improvement over prior quantum algorithms in terms of complexity by exploiting the similarity between the two thermal states. Further impro vements arise from a judicious choice of the nonequilibrium process.\n\nI w ill start the talk with a review of fluctuation theorems relevant to this w ork before describing the thermal state preparation algorithm in detail. Th e essential ingredients of our algorithm are the definition of a "\;wor k operator"\;\, introduction of a work cutoff and an approximation of t he exponentiated work operator on a subspace of work values above the cutof f. Special cases of when H0 and H1 commute and when they are both local spi n Hamiltonians will be discussed. For the transverse field Ising model I wi ll numerically demonstrate the effect of using different nonequilibrium pro cesses on the complexity of the algorithm. LAST-MODIFIED:20220405T171230Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/91755777057? pwd=Z0U2dDVjRG1icFBFN1VSbXZmbGtuQT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Yigit Subasi TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220413T160000Z DTEND:20220413T170000Z DTSTAMP:20220808T214455Z UID:33575dubagh8jq6ma56ii8p1r2@google.com CREATED:20220207T165146Z DESCRIPTION:Speaker: TBA

Title: TBA< b>

Abstract: \; https://mse.umd.edu/seminar-series
LAST-MODIFIED:20220405T132521Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220414T180000Z DTEND:20220414T193000Z DTSTAMP:20220808T214455Z UID:6cjrmaflfjob6jpv7cpkj6q841@google.com CREATED:20220225T152014Z DESCRIPTION:

Title Atomic semiconductor via flat phonon ban ds in HfO2

Abstract: Flat energy bands in the momentum space of electrons were known to generate spatially localized states and p roduce unconventional phenomena such as graphene superconductivity. However \, flat bands in a phonon had not been discovered yet. We were the first to discover that they exist in a ferroelectric HfO2 \;and prod uce localized polar displacement of individual atomic layers [1]. Strikingl y\, this atomic layer is freely displaced by external voltage for the dense st information storage. Our theory of atom control directly in solid [1] is applicable to the Si-compatible HfO2\, so can be materialized i n most electronic devices reaching up to ~100 TB memories.

 \ ;[1] “Scale-free ferroelectricity driven by flat phonon bands in HfO2< /sub>”\, H.-J. Lee et al.\, Science \;369\, 1343 (2020).


Host: Takeuchi
 \;
Location: Toll Physics Rm 1201

Seminar also on Zoom
Meeting \;Link: \; \;https://umd.zoom.us/j/913 01075848

LAST-MODIFIED:20220405T130346Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC Colloquium: Jun Hee Lee\, Ulsan National Institute of Science a nd Technology(UNIST) TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220407T123000 DTEND;TZID=America/New_York:20220407T140000 DTSTAMP:20220808T214455Z UID:7h00ho737srmmhugt5dklv91t3@google.com RECURRENCE-ID;TZID=America/New_York:20220407T123000 CREATED:20220308T204846Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/94067038750

Speaker: \;Lena Funcke\, MIT

Title: Machine Learning for Th ermodynamic Observables in Lattice Field Theories

Abstract: In this talk\, I will discuss how applying machine learning techniques to lattice f ield theory is a promising route for solving problems where Markov Chain Mo nte Carlo (MCMC) methods are problematic. More specifically\, I will show t hat deep generative models can be used to estimate thermodynamic observable s like the free energy\, which contrasts with existing MCMC-based methods t hat are limited to only estimate free energy differences. I will demonstrat e the effectiveness of the proposed method for two-dimensional $\\phi^4$ th eory and compare it to MCMC-based methods in detailed numerical experiments . This talk is based on work with Kim Nicoli and others\, PRL 126\, 032001 (2021).
LAST-MODIFIED:20220404T175018Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220407T150000Z DTEND:20220407T160000Z DTSTAMP:20220808T214455Z UID:4n77mp0j9af706hupv7ucuke8s@google.com CREATED:20220404T152305Z DESCRIPTION:

Speaker: \;Aavish kar Patel\, UC Berkeley

Where: ATL4402

< b>Title: \;Metals with strongly correlated electrons: a tale of int eractions and disorder


Abstract
: \;In most common meta ls\, the many-body physics of their electrons can be described in terms of additive\, weakly interacting excitations called quasiparticles. However\, several examples of metallic states of matter related to the “high” tempera ture superconductors and other strongly correlated materials exist\, in whi ch strong electron-electron interactions near putative quantum critical poi nts or phases lead to very unconventional physics that cannot be described by quasiparticles\, even as the electron liquid remains compressible. Accur ately taking into account the effects of such interactions has posed a deca des-long challenge for the mathematical methods of quantum many-body physic s\, which have largely relied on the existence of weakly interacting quasip articles. I will describe my recent work that develops a new mathematical f ormalism which can accurately describe the physics of these metals without quasiparticles\, allowing for the controlled computation of a whole host of experimentally measurable static and dynamic quantities\, despite the pres ence of both strong correlations and disorder. This work further leads to t he realization that disorder in the experimental samples may be crucial for describing the essential physics of these strange metals. Time permitting\ , I will also show that the scrambling of quantum information\,as measured by out-of-time-ordered correlators\, in large-N models of quantum critical metals with Fermi surfaces occurs at the maximum possible rate\, and explic itly demonstrate that this phenomenon is tied to the lack of well-defined q uasiparticles in such systems.

Host: Dr. Jay Sau

LAST-MODIFIED:20220404T152305Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Science and Information Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220408T140000Z DTEND:20220408T150000Z DTSTAMP:20220808T214455Z UID:143biu124gpu8agqoklschd5e8@google.com CREATED:20220403T201754Z DESCRIPTION:Title: Quantum advantage in learning from experimen ts
Speaker: Hsin-Yuan (Robert) Huang (Caltech)
Time: Friday\, April 8\, 2022 - 10:00am
Location: ATL 3100A and Virtual Via Zoom: http s://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09
Quantum technology has the potential to revolutionize how we acquire and process experimental data to learn about the physical world. An experimenta l setup that transduces data from a physical system to a stable quantum mem ory\, and processes that data using a quantum computer\, could have signifi cant advantages over conventional experiments in which the physical system is measured and the outcomes are processed using a classical computer. We p rove that\, in various tasks\, quantum machines can learn from exponentiall y fewer experiments than those required in conventional experiments. The ex ponential advantage holds in predicting properties of physical systems\, pe rforming quantum principal component analysis on noisy states\, and learnin g approximate models of physical dynamics. In some tasks\, the quantum proc essing needed to achieve the exponential advantage can be modest\; for exam ple\, one can simultaneously learn about many noncommuting observables by p rocessing only two copies of the system. Conducting experiments with up to 40 superconducting qubits and 1300 quantum gates\, we demonstrate that a su bstantial quantum advantage can be realized using today's relatively noisy quantum processors. Our results highlight how quantum technology can enable powerful new strategies to learn about nature.

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LAST-MODIFIED:20220403T202748Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/9893676372?p wd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 SEQUENCE:3 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Hsin-Yuan (Robert) Huang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220404T160000 DTEND;TZID=America/New_York:20220404T173000 DTSTAMP:20220808T214455Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220404T160000 CREATED:20220131T204640Z DESCRIPTION:

STM studies of the heavy fermion \;superconductor UTe 2 \;  \; \;


V idya Madhavan
University of Illinois\, Urbana Champaign

Spin-triplet s uperconductivity is a condensate of electron pairs with spin-1 and an odd-p arity wavefunction. A particularly interesting manifestation of triplet pai ring is a chiral p-wave state which is topologically non-trivial and a natu ral platform for realizing Majorana edge modes. Triplet pairing is however rare in solid state systems. The best-known example of chiral spin-triplet paring is the superfluid 3He-A phase and over the last few decad es\, there has been an intensive search for potential spin-triplet supercon ductors in solid-state systems. Since pairing is most naturally mediated by ferromagnetic spin fluctuations\, uranium based heavy fermion systems cont aining f-electron elements that can harbor both strong correlations and magnetism are considered ideal candidate spin-triplet superconductors. In this work I will present scanning tunneling microscopy(STM) data on the newly discovered heavy fermion superconductor\, UTe2with a T< /i>SC of 1.6 K. I will show signatures of coexisting Kondo effec t and superconductivity which show competing spatial modulations within one unit-cell. \; STM spectroscopy at step edges show signatures of chiral in-gap states\, predicted to exist at the boundaries of a topological supe rconductor. Finally\, I will discuss signatures of other co-existing phases in this complex superconductor. \;

In-Person Location: Toll Physics Room # 1201
Time: 4pm -6pm LAST-MODIFIED:20220401T184019Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838c: SPECIAL SEMINAR by Vidya Madhavan\, UIUC TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220405T160000 DTEND;TZID=America/New_York:20220405T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu_R20220215T210000@google.com RECURRENCE-ID;TZID=America/New_York:20220405T160000 CREATED:20200116T204737Z DESCRIPTION:Helical tunneling of Dirac Fermions
Vidya Madhavan\, University of Illinois Urbana-Champaign
A well-known result from quantum mechanics is that when normal electrons sca tter from a potential barrier\, the probability of tunneling is suppressed with both barrier height and width. In a surprising result\, Oskar Klein sh owed in 1929 that relativistic Dirac fermions can show completely unexpecte d tunneling behavior. For example\, an electron encountering a barrier may be perfectly transmitted even for an infinitely tall barrier. Topological i nsulators hosting boundary modes with Dirac dispersion are ideal candidates to demonstrate the unique tunneling properties of relativistic fermions. H owever\, such experiments have been difficult to carry out due to a combina tion of materials issues and geometric constraints. In this work we use nan owires of a special correlated topological insulator (SmB6) mounted on the tip of a scanning tunneling microscope to demonstrate a tunneling process c alled `helical tunneling’ where the tunneling Dirac fermions are spin-polar ized even in the absence of broken time-reversal symmetry. Our calculations show that the spin-polarization must reverse sign when traveling in the op posite direction\, which we confirm in our experiments. Our findings show t hat the topological surface states in SmB6 nanowires are conduits for robus t spin polarized currents and demonstrate another unexpected tunneling prop erty of relativistic Dirac electrons.

LAST-MODIFIED:20220401T183151Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220408T150000Z DTEND:20220408T160000Z DTSTAMP:20220808T214455Z UID:4o3fib360hk7hvgl0nkump6bpm@google.com CREATED:20220401T135721Z DESCRIPTION:The Sound of Quantum Mechanics
Konrad Lehn ert\, \; JILA\, NIST and CU Boulder
 \;
In the past decade a new technology domain of quantum sound has emerged. Unlike electrical and o ptical systems\, which are governed by fundamental equations of electromagn etism\, acoustical and vibrational phenomena are described by the equations of elastic waves in solid bodies. They are subject to different limitation s and can reach different regimes of behavior. Sound is different. The spee d of sound in a solid material is 100\,000-fold slower than light\, elastic waves do not propagate through vacuum\, and they can couple to atom-like s ystems through strain rather than electrical or magnetic dipole interaction s. These facts have consequences for quantum information science that we ha ve yet to fully understand. In his talk\, I will describe the emergence of this new branch of quantum science\, showing both striking demonstrations o f quantum sound and highlighting potential applications. In particular\, I will demonstrate the dual wave-particle nature of phonons and discuss how q uantum acoustics might be the key enabling technology for quantum communica tion networks.
LAST-MODIFIED:20220401T143125Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220412T150000Z DTEND:20220412T160000Z DTSTAMP:20220808T214455Z UID:7p60hucrc502cksphfgbpgbmli@google.com CREATED:20220401T143055Z DESCRIPTION:Quantum information processing based on spins in semiconduct or quantum dots
Yinyu Liu\, Harvard University

The field of Quantum Information is of great excitement in both fundamental physics and industry. One promising platform for quantum computing is gate-defined quan tum dots in semiconductors. The greatest limiting factor currently is that delicate quantum states can lose their quantum nature due to interactions w ith their environment. Other open challenges are to coherently control larg e-scale spin qubits and develop methods to entangle quantum bits that are s eparated by significant distances.
Silicon-based materials are promising due to the long lifetimes of electrons’ quantum states\, but also challeng ing due to the difficulty in fabrication and valley degeneracy. I will repo rt a singlet-triplet qubit with a qubit gate that is assisted by the valley states. This work would potentially relax the design and fabrication requi rement for scaling. Moreover\, strong coupling between electron spins and p hotons in hybrid circuit-QED architecture has been achieved in this researc h field. Quantum optics\, long-distance quantum entanglement\, and communic ation via photons are promised. To address that\, I will present my project in hybrid circuit-QED architecture where we invented a semiconductor singl e atom maser that can be tuned in situ. I will demonstrate that a semicond uctor-based quantum dot is a promising platform for quantum information as well as for fundamental physics. LAST-MODIFIED:20220401T143055Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220405T150000Z DTEND:20220405T160000Z DTSTAMP:20220808T214455Z UID:28qlas691abi971fdkaref9goh@google.com CREATED:20220401T135435Z DESCRIPTION:New frontiers in quantum simulation and co mputation with neutral atom arrays

Giulia Semeghini\, Harvard Un iversity


Learning how to create\, study\, and manipula te highly entangled states of matter is key to understanding exotic phenome na in condensed matter and high energy physics\, as well as to the developm ent of useful quantum computers. In this talk\, I will discuss recent exper iments where we demonstrated the realization of a quantum spin liquid phase using Rydberg atoms on frustrated lattices and a \;new \;architect ure based on the coherent transport of entangled atoms through a 2D array. Combining these results with novel technical tools on atom array platforms could open a broad range of possibilities for the exploration of entangled matter\, with powerful applications in quantum simulation and information.< u>
LAST-MODIFIED:20220401T135519Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220406T160000Z DTEND:20220406T170000Z DTSTAMP:20220808T214455Z UID:1g0is62584qlrp7n2h8f135d3q@google.com CREATED:20220207T165118Z DESCRIPTION:Speaker: Hyunseok Oh\, Postdoctoral Associate\, C. Cem Tasan Re search Group\, Massachusetts Institute of Technology

Title: How Can Alloy Design Push Limits? Making Sense and Use of Complexity

Abstrac t: Over the last century\, the compositional and microstructural complexiti es of alloys have dramatically increased in response to accelerating demand s for component safety\, efficiency\, and resistance to harsh environments. However\, resulting multi-scale interactions that govern the engineering p roperties can rarely be explained by practical and well-established methods such as mean-field averaging\, which renders alloy design an empirical tri al-and-error undertaking.

In this seminar\, Dr. Oh will introduce my rese arch approach to overcoming property trade-offs in alloys. This approach ha rnesses compositional/microstructural complexities\, using both metallurgic al principles and in-situ characterization techniques. First\, he will pres ent the development of a Ni-V alloy\, which exhibits a far greater strength -ductility combination than any other existing face­ centered cubic complex -concentrated alloys (CCAs)\, by using a simple parameter: electronegativit y difference. Second\, he will highlight a precipitation-hardened martensit ic stainless steel\, which achieves improved ductility without sacrificing strength by introducing austenite grains that remain as strong as the marte nsitic matrix they are embedded in. Third\, he will discuss the Co-Ni-Cr-N CCAs exhibiting a desirable plasticity mechanism change (from martensitic t ransformation to faulting) induced by short-range ordering. These investiga tions demonstrate how blending metallurgical principles with in-situ charac terization techniques can produce generic design guidelines to effectively explore the immense degrees of freedom in compositional and microstructural space and achieve superior property combinations.

Bio:

Hyunseo k Oh is currently a postdoctoral associate in the Department of Materials S cience and Engineering at Massachusetts Institute of Technology (advisor: P rof. C. Cem Tasan). He received B.Sc. and Ph.D. degrees in the Department o f Materials Science and Engineering from Seoul National University in South Korea (advisor: Prof. Eun Soo Park). During his Ph.D. he was also a visiti ng student in the Microstructure Physics and Alloy Design department at Max -Planck-lnstitut fur Eisenforschung (Germany). Hyunseok's research is focus ed on understanding and utilizing fundamentals of the process-structure-pro perty correlations in metals\, with particular emphasis on atomic- and micr o-scale behaviors\, to design advanced engineering alloys.

LAST-MODIFIED:20220331T183201Z LOCATION:CHE 2110 and via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220405T171500Z DTEND:20220405T181500Z DTSTAMP:20220808T214455Z UID:46u9uq7c7ni68ijd3t0nk23ll2@google.com CREATED:20220207T155226Z DESCRIPTION:Speaker: Professor Joel Yuen-Zh ou\, University of California San Diego - \;http://yuenzhougroup.ucsd.edu/

Title: Unusual Ligh t-molecule Interactions: Polariton Condensates and other Nonlinear Phenomen a

Abstract: \;
Confinement of molecules in optical microcavities gives rise to collective strong light-matter coup ling and the formation of hybrid light-matter modes known as polaritons. Wh ile these modes potentially offer unusual chemical reactivity\, their use i s limited by their very short lifetimes owing to an entropic flow of popula tion into the so-called dark modes. However\, past a certain threshold of o ptical pumping\, the population of polariton modes can become self-catalyti c\, giving rise to a nonequilibrium version of Bose-Einstein condensation. Polariton condensation has been routinely demonstrated with organic dyes at room temperature since the last decade. I will provide a chemical outlook for these condensates\, demonstrating that their photochemical reactivity c an be rather rich and different from plain laser-driven molecules. \;&n bsp\;

In the second part of my talk\, I will discuss interestin g connections between topological phases of matter and chiroptical spectros copy of molecules\, describing a scheme to distinguish molecular enantiomer s using the recently introduced ideas of topological frequency conversion.< /p>


LAST-MODIFIED:20220331T134905Z LOCATION:IPST Building\, 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220406T150000Z DTEND:20220406T161500Z DTSTAMP:20220808T214455Z UID:35ekn2u1it5ucukkqqmls6kejk@google.com CREATED:20220331T134010Z DESCRIPTION:Title: How to simulate quantum measurement without computing m arginals\nSpeaker: David Gosset (University of Waterloo/IQC)\nTime: Wedne sday\, April 6\, 2022 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoo m.us/j/91489930870?pwd=Zzhzcjh1K1pGMVhSUzI4VndyZzBLdz09 Meeting ID: 914 8993 0870 Passcode: 202544\n\nIn this work we provide new techniques for a fundamental and ubiquitous task: simulating measurement of a quantum state in the standard basis. Our algorithms reduce the sampling task to computi ng poly(n) amplitudes of n-qubit states\; unlike previously known technique s they do not require computation of marginal probabilities. First we consi der the case where the state of interest is the output state of an m-gate q uantum circuit U. We propose an exact sampling algorithm which involves com puting O(m) amplitudes of n-qubit states generated by subcircuits of U span ned by the first t=1\,2\,…\,m gates. We show that our algorithm can signifi cantly accelerate quantum circuit simulations based on tensor network contr action methods or low-rank stabilizer decompositions. Second\, we consider the case in which ψ is the unique ground state of a local Hamiltonian with a spectral gap that is lower bounded by an inverse polynomial function of n. We prove that a simple Metropolis-Hastings Markov Chain mixes rapidly to the desired probability distribution provided that ψ obeys a certain techn ical condition\, which we show is satisfied for all sign-problem free Hamil tonians. This talk will be mostly based on arXiv:2112.08499 which is joint work with Sergey Bravyi and Yinchen Liu.\n\nJoin Zoom Meeting\n\nhttps://umd. zoom.us/j/91489930870?pwd=Zzhzcjh1K1pGMVhSUzI4VndyZzBLdz09\n\nMeeting I D: 914 8993 0870\nPasscode: 202544 LAST-MODIFIED:20220331T134010Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/91489930870?pwd=Zzhzcjh1K1 pGMVhSUzI4VndyZzBLdz09 Meeting ID: 914 8993 0870 Passcode: 202544 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: David Gosset TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220404T180000Z DTEND:20220404T190000Z DTSTAMP:20220808T214455Z UID:2jvhf05ri29ooh7bsb8r5hj4ja@google.com CREATED:20220331T125812Z DESCRIPTION:Title: Quantum Computation and Cryptography: a changing landscape
Speaker: Andrea Coladangelo (Simons Institute for the Theory of Computing)
Time: Monday\, April 4\, 2022 - 2:00pm
Virtual Via Zo om: https://umd.zoom.us/j/98095131895?pwd=bFRySUJZSytQcjFVVis0dFpuWU1TZz09

Quantum computers will reshape the landscape of cryptography. On t he one hand\, they threaten the security of most modern cryptosystems. On t he other\, they offer fundamentally new ways to realize tasks that were nev er before thought to be possible. Crucially\, cryptography is also a powerf ul lens through which to understand quantum computation. In this talk\, I w ill explore the interplay between quantum computation and cryptography\, an d the many exciting questions at this intersection. I will describe example s that leverage quantum computers to protect against coercion in online ele ctions\, and to prevent piracy of software. LAST-MODIFIED:20220331T125812Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/98095131895?pwd=bFRySUJZSy tQcjFVVis0dFpuWU1TZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CS Seminar: Andrea Coladangelo TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220407T180000Z DTEND:20220407T193000Z DTSTAMP:20220808T214455Z UID:6mde3dlhj6tcer64bc62c0d8rc@google.com CREATED:20220330T202513Z DESCRIPTION:

Title: The low temperature \;thermal Hall conductivit y in the Kitaev magnet a-RuCl3

Abstract: The layered honeycomb Ki taev magnet a-RuCl3 is of strong topical interest. The AF state which appea rs below 7 K is suppressed when \;B \;(applied along the zig zag axis \;a) exceeds 7 T.

The resulting phase is widely r egarded as a quantum spin liquid (QSL). The thermal conductivity tensor Kij \;provides an incisive probe of the transport properties of the spin excitations.

I will discuss high-resolution measurements of both Kxx \;and Kxy \;at temperatures 0.4 K t o 10 K with focus on the controversy whether the planar thermal Hall conduc tivity Kxy \;is half quantized. Our measurements (Ref. 1) su pport a thermal Hall signal that arises from bosonic edge modes carrying sp in excitations in a finite Berry curvature \\Omega. This picture is orthogo nal to the Majorana fermion picture advocated by the Kyoto group. I will al so describe quantum oscillations observed in Kxx \;inthe QSL state below 4 K. \;

  1. Peter Czajka et al.\, Nature Phys. 2021 \, and preprint.

Host: Richard Greene


Time: 2pm - 3 :30pm

Seminar on Zoom
Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848 LAST-MODIFIED:20220330T202821Z LOCATION:ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM : Nai Phuan Ong\, Princeton University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220509T200000Z DTEND:20220509T210000Z DTSTAMP:20220808T214455Z UID:4hgr6cjfi776r5hah3hm739h46@google.com CREATED:20220127T163431Z DESCRIPTION:

Title: \;Multi -scale computational studies of biomolecular dynamics\, regulation\, and ph ase separation

Speaker: \;Davit Potoya n\, Iowa State University

Hosted by:  \;Garegin Papoian

Abstract: \;

Cellular life is contingent on the ability of biomolecules to self-organize by forming dy namic and functional compartments. Uncovering the underlying driving forces for biomolecular self-organization is a long-standing fundamental problem for biological sciences. Experiments of the last decade have found that liq uid-liquid phase separation of biomolecules underlies the formation of a la rge number of mesoscopic cellular compartments. Ability to phase separation is encoded in sequence of biomolecules. However\, \;in vivo&nbs p\;biomolecules phase-separate in a heterogenous and out of equilibrium env ironments which further complicates the extraction of simple sequence-funct ion relationships. \; Disentangling the roles of sequence and environme nt on biomolecular phase separation is posing unique challenges for both th eory and experiment which call for the development of novel interdisciplina ry multi-scale computational approaches.

Our group is developi ng and applying multi-scale computational models that use atomistic\, coars e-grained\, and phase-field techniques to study nuclear compartmentalizatio n at different scales\, in and out of equilibrium. In the talk\, we will pr esent a selection of recent results on protein-RNA phase transitions\, meso scale nuclear dynamics of chromatin phase separation\, and detailed models of biomolecular condensates based on bioinformatics and atomistic simulatio ns.

LAST-MODIFIED:20220330T143437Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220408T170000Z DTEND:20220408T174500Z DTSTAMP:20220808T214455Z UID:2f6lipo3t93vu1depto7svv10b@google.com CREATED:20220330T005135Z DESCRIPTION:Title: Equivalence between fermion-to-qubit mappings in two sp atial dimensions\nFriday Quantum Seminar\nSpeaker: Yijia Xu (QuICS)\nTime: Friday\, April 8\, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoo m: https://umd.zoom.us/j/96160177762\ n\nWe argue that all locality-preserving mappings between fermionic observa bles and Pauli matrices on a two-dimensional lattice can be generated from the exact bosonization (arXiv:1711.00515)\, whose gauge constraints project onto the subspace of the toric code with emergent fermions. Starting from the exact bosonization and applying Clifford finite-depth generalized local unitary (gLU) transformation\, we can achieve all possible fermion-to-qubi t mappings (up to the re-pairing of Majorana fermions). In particular\, we discover a new super-compact encoding using 1.25 qubits per fermion on the square lattice\, which is lower than any method in the literature. We prove the existence of fermion-to-qubit mappings with qubit-fermion ratios 1+1/2 k for positive integers k\, where the proof utilizes the trivialness of qua ntum cellular automata (QCA) in two spatial dimensions. When the ratio appr oaches 1\, the fermion-to-qubit mapping reduces to the 1d Jordan-Wigner tra nsformation along a certain path in the two-dimensional lattice. Finally\, we explicitly demonstrate that the Bravyi-Kitaev superfast simulation\, the Verstraete-Cirac auxiliary method\, Kitaev'\;s exactly solved model\, t he Majorana loop stabilizer codes\, and the compact fermion-to-qubit mappin g can all be obtained from the exact bosonization.\n\n(Pizza and refreshmen ts will be served after the talk.) LAST-MODIFIED:20220330T005135Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Yijia Xu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220425T203000Z DTEND:20220425T213000Z DTSTAMP:20220808T214455Z UID:65ah7s18gb0853osftm2q8oahu@google.com CREATED:20220329T231830Z DESCRIPTION:Title: \;Geomagnetic Storms and Space Hazards: Significance of Meso-scale Structures in Ionosphere-Thermosphere System

Speaker: Yue Deng\, University of Texas at Arlington

Abstract: Space environ ment includes Sun\, Solar wind (a.k.a. heliosphere)\, magnetosphere and ion osphere-thermosphere (a.k.a. upper atmosphere). The geomagnetic storms can be triggered by the activities on the Sun and in the heliosphere\, which ca n strongly influence the coupling between magnetosphere and ionosphere\, an d the energy deposited into the upper atmosphere. The impact of geomagnetic storms on our geospace environment and society is the primary focus of spa ce weather action. The typical space weather impacts include changing satel lite orbits through increasing atmospheric drag\, damaging the power lines and pipelines through geomagnetically induced currents (GICs)\, influencing the GPS and high-frequency (HF) communications through ionospheric variati ons. A recent significant change in our understanding of the ionosphere-the rmosphere system is the frequent driving by dynamic meso-scale structures ( 50 km - 500 km) that couple to the magnetosphere in the polar cap region\, the dayside cusp and along auroral oval and sub-auroral magnetic field line s. These structures play a critical role in Space Weather dynamics\, intera cting with the more slowly changing\, large-scale structure that is more di rectly driven by interaction with the solar wind. The Global Ionosphere The rmosphere Model (GITM)\, a self-consistent non-hydrostatic model in the upp er atmosphere with a flexible resolution\, is suitable for studying transie nt meso-scale phenomena. To improve the description of meso-scale structure s in geomagnetic forcing and to evaluate the influence of such structures o n the global dynamics of the upper atmosphere\, various data and models are utilized to investigate the variations of energy inputs in the cusp\, sub- auroral regions and within flow bursts\, and their influences on the couple d thermosphere-ionosphere system.

Notes: \;Join the meeting at 4 :15 for meet and greet.  \;Visit https://bit.ly/2PmJoT6 \;for access LAST-MODIFIED:20220329T231830Z LOCATION:Online via zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220404T190000Z DTEND:20220404T203000Z DTSTAMP:20220808T214455Z UID:4hor8penl4bpakd5n1rts36vfh@google.com CREATED:20220120T141137Z DESCRIPTION:Speaker: Robert Lasenby\, Stanford University

Title: New particles and collective effects

Abstract: There are man y ways to search for new particles beyond the Standard Model\, such as dete cting a relic dark matter abundance\, or production in high-energy processe s. To understand these\, one needs to calculate how the new particles inter act with Standard Model matter. Sometimes\, one can simply calculate Feynma n diagrams between a few particles. However\, in dense Standard Model envir onments\, coherent interactions with many Standard Model particles can be v ery important\, and can affect the rates of processes involving new particl es by orders of magnitude. In this seminar\, I will discuss these effects i n different scenarios\, including particle production in stars\, dark matte r scattering in astrophysical systems and in the laboratory\, and absorptio n of light bosonic dark matter in experiments.
LAST-MODIFIED:20220329T173655Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220405T150000Z DTEND:20220405T160000Z DTSTAMP:20220808T214455Z UID:7s0fhhdmu3jqfhqr5befljo6cs@google.com CREATED:20220121T163713Z DESCRIPTION:Speaker: \;Dr. Kin Fai Mak (Cornell University)
Zoom link: \;https://umd.zoom.us/j/3606167531?pwd=Q1hWU C9zK2J0eXp1NzMvamtNZThDUT09
Title: \;Kane-Mele-Hubbar d physics in semiconductor moiré materials
Abstract: \;Semico nductor moiré materials provide a physical realization of the Kane-Mele-Hub bard model for studies of the combined effects of non-trivial band topology and strong electronic correlations. In this talk\, I will discuss the rich electronic phase diagram of the Kane-Mele-Hubbard model realized in AB-sta cked MoTe2/WSe2 \;moiré bilayers. In particular\, I will discuss the emergence of the quantum spin Hall and the quantum anom alous Hall effects\, the realization of the Haldane model\, the nature of t he Chern insulators\, and\, if time permits\, a metamagnetic quantum phase transition between different intervalley coherent states. \;
Host : \;Jiabin Yu


Email emartin3@umd.edu for questions
LAST-MODIFIED:20220329T172116Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220425T200000Z DTEND:20220425T210000Z DTSTAMP:20220808T214455Z UID:4i59t63jrdifl1s95jcnp1clvj@google.com CREATED:20220127T163208Z DESCRIPTION:

Title: \;Genome Organ ization through Phase Separation: Random yet Precise

Speak er: \;Bin Zhang\, MIT

Hosted by: \;Garegin Papoian

Abstract:

The three-dimensional genome organization plays an essential role in all DNA-te mplated processes\, including gene transcription\, gene regulation\, DNA re plication\, etc. Coarse-grained models parameterized to reproduce experimen tal data via the maximum entropy optimization algorithm serve as effective means to study genome organization at various length scales. They have prov ided insight into the principles of whole-genome organization and enabled d e novo predictions of chromosome structures from epigenetic modifications. In addition\, they provided insight into the critical role of the chromatin network in stabilizing multiple liquid droplets. Applications of these mod els at a near-atomic resolution further revealed physicochemical interactio ns that drive the phase separation of disordered proteins and dictate chrom atin stability in situ.

LAST-MODIFIED:20220329T142503Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220411T200000Z DTEND:20220411T210000Z DTSTAMP:20220808T214455Z UID:43nkj0ucalaq1i7q7icr3pcprp@google.com CREATED:20220127T163115Z DESCRIPTION:

Title: \;Free- energy profiles from cryoEM particles

Speaker : \;Pilar Cossio\, Flatiron Institute

Hosted b y: \;Pratyush Tiwary

Abstract: \;< /p>

Cryo-electron microscopy (cryo-EM) is an experimental technique that measures single-particle projections of biomolecules. Although single-parti cle cryo-EM is widely used for 3D reconstruction\, it has the potential to provide information about a biomolecule’s conformational variability\, whic h leads to the underlying free-energy landscape of the system. However\, cr yo-EM images are challenging to analyze due to their low signal-to-noise ra tio. To address these issues\, we developed the cryo-BIFE method. This meth od uses a path collective variable together with a Bayesian approach to inf er free-energy profiles and their uncertainties from cryo-EM raw images. We apply the method over a diverse set of synthetic and real systems\, findin g that the signal-to-noise ratio and pose estimate as key determinants to e xtracting accurate \;profiles.

Zoom Link:
h ttps://umd.zoom.us/j/97881020532?pwd=L1ArV203ZlBmU1daMUtwd3Vz UlppUT09
Meeting ID: 978 8102 0532
Passcode: 50 4141


LAST-MODIFIED:20220329T142400Z LOCATION:Online Seminar via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220404T200000Z DTEND:20220404T210000Z DTSTAMP:20220808T214455Z UID:05d76btlsstklplbjubo0alsbi@google.com CREATED:20220127T162955Z DESCRIPTION:Speaker: \;Valeri Bar segov\, University of Massachusetts Lowell

Locatio n: \;Conference Room (1116)\, Institute for Physical Science and Technology (IPST) Building \;

Time: \;4PM \;(Eastern Time\; US and Canada)
Title: \;CellDynaMo – Stochastic Re action-Diffusion-Dynamics Model: \;Application to Search-and-Capture Pr ocess of Mitotic Spindle Assembly

Abstract: \;

We introduce a \;Stochastic Reacti on-Diffusion-Dynamics Model \;(SRDDM) for simulations of cellular proce sses with high spatial and temporal resolution. \;The SRDDM model is ma pped into the \;CellDynaMo package\, which couples the spatially inhomo geneous reaction-diffusion master equation to account for biochemical react ions and molecular transport and the Langevin Dynamics framework to describ e dynamic mechanical processes. This computational infrastructure allows th e simulation of hours of cell dynamics in reasonable GPU time. \;We app ly the model to test the performance of \;Search-and-Capture mod el \;of mitotic spindle assembly by simulating dynamic instability of e lastic microtubules anchored in two centrosomes\, movement and deformations of geometrically realistic centromeres with flexible kinetochores and chro mosome arms\, mechanics and kinetics of transient attachments/detachments o f microtubules to the chromosomal kinetochores with attachment/detachment r ates depending on phosphorylation states of the Ndc80 linkers\, which are r egulated by Aurora A and B kinase enzymes undergoing restricted diffusion. There is an optimal rate of microtubule-kinetochore detachments which maxim izes the accuracy of the chromosome connections. Adding chromosome arms to kinetochores improve the accuracy by slowing down chromosome movements. Aur ora A and kinetochore deformations have a small positive effect on the atta chment accuracy. Thermal fluctuations of the microtubules increase the rate s of kinetochore capture and also improve the accuracy of spindle assembly.

LAST-MODIFIED:20220329T141834Z LOCATION:Conference Room (1116)\, Institute for Physical Science and Techno logy (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220418T203000Z DTEND:20220418T213000Z DTSTAMP:20220808T214455Z UID:7nu7sa05nutuff6n8oa3cphfii@google.com CREATED:20220328T192159Z DESCRIPTION:Title: \;Dark Matter Searches in Space and in High Intensit y Proton Accelerators

Speaker: Wooyoung Jang\, University of Texas a t Arlington

Abstract: Dark matter hypothesized in the 1930s is thoug ht to make up a quarter of the mass/energy in the universe. Experiments to elucidate the identity of dark matter have been conducted in various enviro nments from subterranean to outer space. Of these\, I will focus on two rad ically different ways of searching for dark matter. I will begin by discuss ing searches for cosmogenic dark matter in space\, specifically at the Alph a Magnetic Spectrometer (AMS) experiment. I will review the basic physics m otivation of dark matter search in cosmic rays and will discuss how the dar k matter signature in space is studied by measuring electron and positron f lux in the AMS-02 detector. I will then discuss the recent efforts of searc hing for dark matter produced by high-intensity proton beams in future neut rino facilities. I will discuss the overall scenario of data analysis\, lev eraging the strengths of the detector\, simulation\, and analysis technique s used in these studies. I will conclude with dark matter search sensitivit y at the Deep Underground Neutrino Experiment\, the U.S. flagship neutrino experiment.

Notes: Join the meeting at 4:15 for meet and greet. &nbs p\;Visit http s://bit.ly/2PmJoT6 \;for access LAST-MODIFIED:20220328T192159Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220401T173000Z DTEND:20220401T183000Z DTSTAMP:20220808T214455Z UID:3glinubgl8r3q22slq20nk54gj@google.com CREATED:20220328T164812Z DESCRIPTION:Disorder-induced topology and more surpris es from synthetic quantum matter

Bryce Gadway\, University of Il linois

Artificial materials made up of atoms\, molecules\, and li ght have opened up exciting opportunities to explore quantum physics in exo tic regimes. Through their manipulation with laser light and other fields\, ultracold gases of atoms and molecules can be used to study phenomena rela ted to condensed matter\, high energy\, and nuclear physics\, and can furth ermore play host to entirely unique kinds of many-body effects. In this tal k\, I'll describe how recent approaches based on the use of ``synthetic dim ensions\,'' where dynamics occur in a space relating to internal or other a uxiliary degrees of freedom\, have opened up new capabilities for the study of topology and localization physics. As one example\, I'll describe how t he addition of disorder to a synthetic atomic wire leads to the surprising appearance of nontrivial topological properties. Looking ahead\, I'll discu ss out how extensions to the synthetic dimensions approach with atoms\, mol ecules\, and other platforms promise to introduce new kinds of exotic many- body states and phenomena in the years to come.

LAST-MODIFIED:20220328T165106Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220406T150000Z DTEND:20220406T160000Z DTSTAMP:20220808T214455Z UID:7ngeomnp7u68lg0jg6k3ldn791@google.com CREATED:20220207T175859Z DESCRIPTION:Speaker: Dr. Joel Yuen-Zhou\, UC San Diego

Ti tle: Polariton Chemistry: Molecules in Optical Cavities

Abstract:&nb sp\;
Organic molecules interact strongly with confined electroma gnetic fields in plasmonic arrays or optical microcavities owing to their b right transition dipole moments. This interaction gives rise to molecular p olaritons\, hybrid light-matter quasiparticles. Molecular polaritonics open s doors for new room-temperature opportunities for the nontrivial control o f physico-chemical properties of molecular assemblies. In this talk\, I’ll showcase some of these opportunities that we have been theoretically (and\, together with our experimental collaborators) exploring in the past few ye ars. I will briefly discuss the relevant time and energy scales associated with molecular polaritons and strategies to exploit them to control photoex cited processes including singlet fission\, triplet harvesting\, remote ene rgy transfer\, and anomalous nonlinear optical effects. Finally\, I will co nclude by explaining how vibrational polaritons can steer ground-state chem ical reactions even in the absence of optical pumping\, or be used to reali ze exotic processes such as remote control of chemical reactions. LAST-MODIFIED:20220328T163605Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220426T220000Z DTEND:20220427T005000Z DTSTAMP:20220808T214455Z UID:7ta29030bsnqhd71g87f8t92kv@google.com CREATED:20220210T150139Z DESCRIPTION:
Suvi Gezari presents the fil m Contact as part of the Science and Society via Film course. All ar e welcome. For information and the entire semester's schedule\, see the cou rse website: https://www.physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220328T162951Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Contact TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220404T150000Z DTEND:20220404T160000Z DTSTAMP:20220808T214455Z UID:0f0ss3e1m2otrdes51d268d332@google.com CREATED:20220121T183521Z DESCRIPTION:Speaker: Subir Sachdev\, Institute for Advanced Study/Harvard University

Title: \;Quantum spin liquids : from Rydberg atoms to the high temperature superconductors

Abstrac t: Quantum spin liquids are remarkable phases of matter in which quantum en tanglement is\, in a precise sense\, truly long-ranged. \; I will descr ibe realization of quantum spin liquid correlations in recent experiments o n pumped Rydberg atoms trapped in arrays of optical tweezers. \; I will also describe how recent theories of quantum spin liquids in metallic stat es provide a description of photoemission observations in the mysterious 'p seudogap' state of the cuprate high temperature superconductors.

Host: Charles Clark
LAST-MODIFIED:20220327T161828Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T150000Z DTEND:20220329T163000Z DTSTAMP:20220808T214455Z UID:6t3ql5cgnnn2s7vork2bbmpqpd@google.com CREATED:20220323T165056Z DESCRIPTION:Speaker: Jianwei Qiu\, JLab

Title:
Exclu sive massive photon-pair production in pion-nucleon collisions for extracti ng generalized parton distributions

Abstract:Generalized parton dist ribution functions (GPDs) are fundamental quantum correlation functions car rying rich information on internal quark-gluon landscape inside a hadron. In this talk\, I will argue that exclusive massive photon-pair production i n pion-nucleon collisions can be systematically studied in terms of QCD fac torization approach if the photon's transverse momentum pT with respect to the colliding pion is sufficient large. This exclusive scattering amplitud e can be factorized into universal pion's distribution amplitude (DA) and n ucleon's GPD\, convoluted with an infrared safe and perturbatively calculab le short-distance hard part. The correction to this factorized expression is suppressed by powers of 1/pT. I will show quantitatively that this new type of exclusive processes is not only complementary to existing processes for extracting GPDs\, but also capable of providing an enhanced sensitivi ty to the momentum fraction x-dependence of both DAs and GPDs. I will also introduce a couple of new and related exclusive processes to enhance our a bility to extract GPDs.
LAST-MODIFIED:20220327T160534Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220331T150000Z DTEND:20220331T160000Z DTSTAMP:20220808T214455Z UID:6rjjdbho50mhumbelm50ud1u4h@google.com CREATED:20220207T175634Z DESCRIPTION:Speaker: Dr. Nagarjuni Gavvalapalli\, Georget own University

Title: Controlled Synthesis of \;π-Conjugated Mat erials Beyond 1D

Abstract: Extension of π-conjugation beyond 1-dimen sion results in materials with novel optical\, electronic\, and optoelectro nic properties. However\, strong π-π intermolecular interactions hamper sol ution phase synthesis of 2D-π-conjugated materials (e.g. graphene)\, induce aggregation of dispersed graphene sheets\, and make it challenging to cont rol the growth morphology (1D\, 2D or 3D) of π-conjugated microcrystals. A common theme in the Gavvalapalli group is controlled synthesis of higher di mensional π-conjugated materials using novel building blocks. My talk is di vided into two parts.

Part-1 focuses on developing π-face masked ary l monomers to generate soluble 1D- and 2D-π-
conjugated materials withou t pendant solubilizing chains. We used aryl repeat units containing \;< em>cycloalkyl straps \;to synthesize high molecular weight soluble 1D- and 2D-π-conjugated strapped materials without pendant solubilizing ch ains. Cycloalkyl straps mask the polymer π-face and therefore reduce interc hain π-π interactions. The unique advantages rendered by the \;cycl oalkyl straps \;enabled diverse materials including soluble conjug ated microporous polymers and 1-D polymers with spatially controlled bindin g sites.

Part-2 focuses on developing novel \;aryl amphiphil es \;and using them as morphology directors to
control π-conjug ated microcrystal growth along the π-stacking direction to realize novel gr owth
morphologies. We have shown that the aryl amphiphiles’ aryl hydroph obe geometry and size play a key role in determining the π-stacking facet g rowth rate and morphology and result in hitherto unknown microcrystal morph ologies with high π-stacking facet surface area. The rod shaped perylene mi crocrystals showed unprecedented exciton-polariton waveguiding along the ed ge-to edge packing direction of the perylene molecules.
LAST-MODIFIED:20220327T160225Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220404T203000Z DTEND:20220404T213000Z DTSTAMP:20220808T214455Z UID:34o1m4bsm7g9t0eig01i5uq9pb@google.com CREATED:20220128T231737Z DESCRIPTION:Title: STO RM: The Solar-Terrestrial Observer for the Response of the Magnetosphere

Speaker: David G. Sibeck\, NASA Goddard Space Flight Center

Abstract: The Solar-Terrestrial Observer for the Response of the Magnetosphere (or STORM) mission was proposed to the 2019 Heliophysics Med ium-Class Explorer opportunity. This self-standing mission would take its o wn observations of the solar wind input whilst imaging the response of the magnetopause location\, auroral oval\, ring current\, plasma sheet\, and ex osphere in soft X-rays\, far-ultraviolet\, suprathermal and energetic neutr als\, and Lyman-a\, respectively\, to provide continuous end-to-end observa tions of the Dungey cycle and geomagnetic storms from a highly-inclined\, c ircular\, orbit with a radius of 30 Earth radii. A dedicated array of red- and green-line auroral imagers deployed across Alaska and Canada complement s the mission by supplying the information needed to determine if and how m icrostructures within the nightside auroral oval trigger substorm onset. Th is presentation focusses on the science motivation and the methodology by w hich the objectives are achieved. In particular\, it describes how the miss ion would distinguish between and quantify fundamental modes of reconnectio n and particle acceleration governing the flow of solar wind energy into an d through the magnetosphere.

Notes: Join the meeting at 4:15 for mee t and greet
Visit https://bit.ly/2PmJoT 6 for access
LAST-MODIFIED:20220327T144418Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220406T160000Z DTEND:20220406T180000Z DTSTAMP:20220808T214455Z UID:56ogu437tbve2jnc7kg6tfvtiu@google.com CREATED:20220310T181924Z DESCRIPTION:Title: Quantum algorithms for linear and non linear differential equations
Speaker: Jin-Peng Liu (QuICS)
Time: W ednesday\, April 6\, 2022 - 12:00pm
Location: Virtual Via Zoom: ht tps://umd.zoom.us/j/4484328258?pwd=RitURDMvVGxXanFuSVZVWjRjOUNvUT09

Quantum computers are expected to dramatically outperform classical com puters for certain computational problems. Originally developed for simulat ing quantum physics\, quantum algorithms have been subsequently developed t o address diverse computational challenges.

There has been extensive previous work for linear dynamics and discrete models\, including Hamilton ian simulations and systems of linear equations. However\, for more complex realistic problems characterized by differential equations\, the capabilit y of quantum computing is far from well understood. One fundamental challen ge is the substantial difference between the linear dynamics of a system of qubits and real-world systems with continuum and nonlinear behaviors.
< br>My research is concerned with mathematical aspects of quantum computing. In this dissertation\, I focus mainly on the design and analysis of quantu m algorithms for differential equations. Systems of linear ordinary differe ntial equations (ODEs) and linear elliptic partial differential equations ( PDEs) appear ubiquitous in natural and social science\, engineering\, and m edicine. I proposed a variety of quantum algorithms based on finite differe nce methods and spectral methods for producing the quantum encoding of the solutions\, with an exponential improvement in the precision over previous quantum algorithms.

Nonlinear differential equations exhibit rich ph enomena in many domains but are notoriously difficult to solve. Whereas pre vious quantum algorithms for general nonlinear equations have been severely limited due to the linearity of quantum mechanics\, I gave the first effic ient quantum algorithm for nonlinear differential equations with sufficient ly strong dissipation. I also established a lower bound\, showing that nonl inear differential equations with sufficiently weak dissipation have worst- case complexity exponential in time\, giving an almost tight classification of the quantum complexity of simulating nonlinear dynamics.

Overall \, utilizing advanced linear algebra techniques and nonlinear analysis\, I attempt to build a bridge between classical and quantum mechanics\, underst and and optimize the power of quantum computation\, and discover new quantu m speedups over classical algorithms with provable guarantees. \;
Join Zoom Meeting
https://umd.zoom.u s/j/4484328258?pwd=RitURDMvVGxXanFuSVZVWjRjOUNvUT09
LAST-MODIFIED:20220327T015253Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/4484328258?pwd=RitURDMvVGx XanFuSVZVWjRjOUNvUT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense: Jin-Peng Liu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220331T180000Z DTEND:20220331T190000Z DTSTAMP:20220808T214455Z UID:67to6ot7a5st5f3inmj92q1nbk@google.com CREATED:20220325T214047Z DESCRIPTION:Title: Post-quantum security of the Even-Mansour cipher
Speaker: Chen Bai (QuICS)
Time: Thursday\, March 31\, 2022 - 2:00pm
Location: Virtual Via Zoom: https://umd.zoom.us/j/97066068585

The Even-Mansour cipher is a s imple method for constructing a (keyed) pseudorandom permutation E from a p ublic random permutation P: {0\,1}^n ->\;{0\,1}^n. It is a core ingredien t in a wide array of symmetric-key constructions\, including several lightw eight cryptosystems presently under consideration for standardization by NI ST. It is secure against classical attacks\, with optimal attacks requiring q_E queries to E and q_P queries to P such that q_P × q_E ≈ 2^n. If the at tacker is given quantum access to both E and P\, however\, the cipher is co mpletely insecure\, with attacks using q_P = q_E = O(n) queries known. In a ny plausible real-world setting\, however\, a quantum attacker would have o nly classical access to the keyed permutation E implemented by honest parti es\, while retaining quantum access to P. Attacks in this setting with q_P^ 2 × q_E ≈ 2^n are known\, showing that security degrades as compared to th e purely classical case\, but leaving open the question as to whether the E ven-Mansour cipher can still be proven secure in this natural ``post-quantu m'\;'\; setting. We resolve this open question\, showing that any att ack in this post-quantum setting requires q^2_P × q_E + q_P × q_E^2 ≈ 2^n . Our results apply to both the two-key and single-key variants of Even-Man sour. Along the way\, we establish several generalizations of results from prior work on quantum-query lower bounds that may be of independent interes t.

(In person viewing at 3100A Atlantic Building)
< u>
LAST-MODIFIED:20220325T214047Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/97066068585 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Chen Bai TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T180000Z DTEND:20220329T190000Z DTSTAMP:20220808T214455Z UID:6tu0m236ut9de8n1vsa53be4u2@google.com CREATED:20220324T151710Z DESCRIPTION:

Speaker: Andrey Gromov

Where: ATL4402

Title: Applied Fractons


Abstract
: Fractons are a class of quasiparticles that can not freely propagate through space. They were first introduced in a model o f quantum (almost) self-correcting memory. Later it became clear that fract ons\, as well as\, adjacent ideas such as tensor gauge theories and multipo le or subsystem conservation laws provide a language to describe some known and some new phenomena. In this talk I will explain what fractons are\, wh at kind of systems are known to support them and what kind of problems they will help to elucidate in the future.

Host: Dr. Jay Sau

LAST-MODIFIED:20220325T210140Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Quantum Science and Information Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T150000Z DTEND:20220329T160000Z DTSTAMP:20220808T214455Z UID:3rak9qecnp98fe7941hd5e1dka@google.com CREATED:20220121T163450Z DESCRIPTION:Speaker: Dr. B. Andrei Bernevig (Princ eton University)
Zoom: \;https://umd.zoom.us/j/3606167531?pwd=Q1hWUC9 zK2J0eXp1NzMvamtNZThDUT09
Title: \;An Exact Map Betw een the TBG (and multilayers) and Topological Heavy Fermions \;
A bstract: \;Magic-angle (θ=1.05∘) twisted bilay er graphene (MATBG) has shown two seemingly contradictory characters: the l ocalization and quantum-dot-like behavior in STM experiments\, and delocali zation in transport experiments. We construct a model\, which naturally cap tures the two aspects\, from the Bistritzer-MacDonald (BM) model in a first principle spirit. A set of local flat-band orbitals (f) centered at the AA-stacking regions are responsible to the localization. A set of extended topological conduction bands (c)\, which are at small energetic separation from the local orbitals\, are respo nsible to the delocalization and transport. The topological flat bands of t he BM model appear as a result of the hybridization of \;f- and \;c-electrons. This model then provi des a new perspective for the strong correlation physics\, which is now des cribed as strongly correlated \;f-electrons couple d to nearly free topological semimetallic \;c-elec trons - we hence name our model as the topological heavy fermion model. Usi ng this model\, we obtain the U(4) and U(4)×U(4) symmetries a s well as the correlated insulator phases and their energies. Simple rules for the ground states and their Chern numbers are derived. Moreover\, featu res such as the large dispersion of the charge \;±1 \ ;excitations and the minima of the charge gap at the \;Γ& nbsp\;point can now\, for the first time\, be understood both qualitatively and quantitatively in a simple physical picture. Our mapping opens the pro spect of using heavy-fermion physics machinery to the superconducting physi cs of MATBG. All the model’s parameters are analytically derived \;
Zoom link: \;https://umd.zoom.us/j/3606167531?pwd=Q1hWUC9zK2J0eXp1NzMvamtNZThDUT09
Host: Jiabin Yu< br>

Email emartin3@umd.edu for any additional questions.
LAST-MODIFIED:20220325T200459Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220331T123000 DTEND;TZID=America/New_York:20220331T140000 DTSTAMP:20220808T214455Z UID:7kricndssf147v6c22iib09spd@google.com RECURRENCE-ID;TZID=America/New_York:20220331T123000 CREATED:20220308T204637Z DESCRIPTION:Speaker: Nikhil Karthik\, JLab

Title: Adding new theoretical dimensions to parton physics of the pion

Abstract:The recently proposed perturbative matching approach has greatly advanced the lattice computations of the x-dependent hadron structure calculations.  \;One goal of this direction is make lattice QCD a tool to determine PDFs\, GPDs and TMDs of real-world hadrons\, in a manner complementary to e xperimental determinations.  \; In this regard\, I will discuss some la ttice QCD computations of the quark PDF and the DA of the real-world pion. Another direction I am excited about\, is to use lattice QCD just a nonpert urbative UV regulator of generic QCD-like strongly-interacting systems — th e perturbative matching approach now enables us to use partonic observables to understand such QFTs\, and consequently\, the qualitative features of h adron structures in real-world QCD. I will present some results on parton p hysics of pion in many-flavor theories and in the large-Nc limit of QCD.

Seminar will also be streamed live \;
via zoom: \;< a href="https://umd.zoom.us/j/94067038750">https://umd.zoom.us/j/9406703 8750 LAST-MODIFIED:20220325T170428Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220407T180000Z DTEND:20220407T190000Z DTSTAMP:20220808T214455Z UID:2vj4kcrs8v1dp952ja631g5tl6@google.com CREATED:20220325T030523Z DESCRIPTION:Title: The Complexity of Near-Term Quantum Computers\nSpeaker: Daniel Grier (University of Waterloo )\nTime: Thursday\, April 7\, 2022 - 2:00pm\nLocation: IRB 4105 and Virtual Via Zoom: https://umd.zoom.us/j/980951 31895?pwd=bFRySUJZSytQcjFVVis0dFpuWU1TZz09\n\nQuantum computing is at a n exciting moment in its history\, with some high-profile experimental succ esses in building programmable quantum devices. That said\, these quantum devices (at least in the near term) will be restricted in several ways\, ra ising questions about their power relative to classical computers. In this talk\, I will present three results which give us a better understanding of these near-term quantum devices\, revealing key features which make them s uperior to their classical counterparts.\n\nFirst\, I will show that consta nt-depth quantum circuits can solve problems that cannot be solved by any c onstant-depth classical circuit consisting of AND\, OR\, NOT\, and PARITY g ates---giving the largest-known unconditional separation between natural cl asses of quantum and classical circuits. Second\, I will show that these q uantum circuits can nevertheless be simulated quickly by classical algorith ms that have no depth restriction\, emphasizing the role that depth plays i n provable quantum advantage. Finally\, I will address some of the experim ental challenges in implementing linear optical quantum computers\, and I w ill prove that they outperform classical computers using standard conjectur es but in more practical experimental regimes. LAST-MODIFIED:20220325T030523Z LOCATION:IRB 4105 and Virtual Via Zoom: https://umd.zoom.us/j/98095131895?p wd=bFRySUJZSytQcjFVVis0dFpuWU1TZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CS Seminar: Daniel Grier TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220401T150000Z DTEND:20220401T160000Z DTSTAMP:20220808T214455Z UID:0ehi26kr0brncsba9kbrvctg33@google.com CREATED:20220325T025800Z DESCRIPTION:Title: Hardware-centric Quantum Algorithm Design\nSpeaker: Mur phy Niu (Google Quantum AI)\nTime: Friday\, April 1\, 2022 - 11:00am\nLocat ion: IRB 4105 and Virtual Via Zoom: https://umd.zoom.us/j/98095131895?pwd=bFR ySUJZSytQcjFVVis0dFpuWU1TZz09\n\nOver the last half-century\, theoretic ians have outlined a quantum path to provably secure communication\, unprec edented sensor sensitivities\, and a quantum advantage to solving problems that are classically hard. However\, cutting-edge research in quantum algor ithms is often detached from exciting progress in quantum hardware engineer ing. This has created a gap between algorithmic requirements and hardware c apabilities. To close this gap\, a deep understanding of quantum hardware p hysics should be integrated into our development of quantum algorithms–what we call hardware-centric algorithm designs. I will review some examples of hardware-centric quantum algorithm design for quantum control\, metrology\ , and error correction. In each case\, the physical details of quantum hard ware can be harnessed in the algorithm design to achieve what is otherwise infeasible:\n\nDemonstrating and verifying quantum advantages in random cir cuits\,\n\nSolving quantum chemistry problems\,\n\nTraining quantum neural networks for classification with experimental noisy intermediate-scale quan tum computers.\n\nLastly\, I will outline the philosophy and software infra structure to assist the co-development of quantum hardware and quantum appl ications to move the field forward. LAST-MODIFIED:20220325T025800Z LOCATION:IRB 4105 and Virtual Via Zoom: https://umd.zoom.us/j/98095131895?p wd=bFRySUJZSytQcjFVVis0dFpuWU1TZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CS Seminar: Murphy Niu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220328T180000Z DTEND:20220328T190000Z DTSTAMP:20220808T214455Z UID:0kcv8q6b649pjsgcdj6n1hn008@google.com CREATED:20220325T024241Z DESCRIPTION:Title: On the Foundations of the Next-Generation Quantum Softw are System\nSpeaker: Gushu Li (University of California\, Santa Barbara)\n Time: Monday\, March 28\, 2022 - 2:00pm\nLocation: Virtual Via Zoom: https: //umd.zoom.us/j/98095131895?pwd=bFRySUJZSytQcjFVVis0dFpuWU1TZz09\n\nThe software system is one essential and critical component in a quantum compu ting system. However\, existing quantum software infrastructures are mainly designed for small-scale quantum computers while they cannot effectively a ccommodate large-scale quantum computing systems. In this talk\, I will fir st summarize the challenges in designing quantum software systems as the si zes of quantum computer systems continue to grow. Then I will show how we c an overcome this grand scalability challenge by leveraging the power of hig h-level operators in various important tasks\, including quantum compiler o ptimization\, quantum program testing\, and so on. In the end\, I will brie fly introduce my work on quantum software-hardware co-design and conclude m y talk with future research opportunities. LAST-MODIFIED:20220325T024241Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/98095131895?pwd=bFRySUJZSy tQcjFVVis0dFpuWU1TZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CS Seminar: Gushu Li TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220401T170000Z DTEND:20220401T174500Z DTSTAMP:20220808T214455Z UID:06cfnm4fpc3mduor4muflakeev@google.com CREATED:20220325T014637Z DESCRIPTION:Title: Monopole Josephson effects in Dirac Spin Liquids\nSpeak er: Gautam Nambiar (University of Maryland)\nTime: Friday\, April 1\, 202 2 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762\n\nDirac Spin Liquids (D SLs) are gapless symmetric states in 2+1 dimensions with no magnetic order. They are featureless\, yet interesting because their low energy physics is believed to be described by QED-3\, an effective field theory in terms of gapless Dirac fermions coupled to an emergent U(1) gauge field. They also s erve as a parent state for seemingly unrelated magnetically ordered states\ , where the ordered states arise from condensation of ``monopole excitation s” of the DSL. Can such a description have experimentally observable conseq uences? For example\, can we\, in theory\, induce and measure an emergent e lectric field inside a DSL? We answer this question in the affirmative by p roposing an “Ordered state - DSL - Ordered state” Josephson junction setup. The ordered states can be viewed as condensates of monopoles which can tun nel between the two ordered states through the middle region of DSL. In thi s talk\, we will go through various interesting consequences depending on t he choice of ordered states and operations performed on them. One of them i s a time-dependent emergent electric field inside the DSL. We propose a way to measure this optically via Raman scattering. In the second part of the talk\, we will go back and take a closer look at the field theory operators \, (such as monopoles and emergent flux)\, and describe our attempt to map them to microscopic spin operators.\n\n(Pizza and refreshments will be serv ed after the talk.)\n LAST-MODIFIED:20220325T014637Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Gautam Nambiar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220328T190000Z DTEND:20220328T203000Z DTSTAMP:20220808T214455Z UID:52e1dqjmeblrvjj2ojcbgc0bb5@google.com CREATED:20220118T144118Z DESCRIPTION:Speaker: Martin Schmaltz\, Boston University
Title: \;"A Step in Understanding the Hubble Tension"
Abstract: \;This talks begins wi th a review of the tension between the locally measured Hubble constant&nbs p\;H0 \;and the value inferred from the CMB. A soluti on to the tension may be provided by models with interacting dark radiation that distinguish between high- and low- \;multipoles. The requ ired "step" in dark radiation can be generated if the dark radiation contai ns both massive and massless particles. When the temperature of the radiati on drops below their mass the massive particles annihilate and transfer the ir entropy to the massless radiation\, thereby increasing the total relativ e energy density. If this transition occurs while CMB-observable modes are inside the horizon\, high- and low- \;peaks are impacted differ ently\, corresponding to modes that enter the horizon before or after the s tep. These dynamics are naturally packaged into the simplest supersymmetric theory\, the Wess-Zumino model\, with the mass of the scalar near the eV-s cale. We investigate the cosmological signatures of such "Wess-Zumino Dark Radiation" (WZDR) and find that it provides an improved fit to the CMB alon e\, favoring larger values of \;H0. If supernovae mea surements from the SH0ES collaboration are also included in the analysis\, the inferred value of \;H0 \;is yet larger\, but the preference for dark radiation and the location of the transition is lef t nearly unchanged. I conclude by comparing our model to the competition an d outline planned extensions of this work.
Seminar will also be live streamed via zoom\, for zoom link please email mknouse@umd.edu LAST-MODIFIED:20220324T182244Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220330T193000Z DTEND:20220330T203000Z DTSTAMP:20220808T214455Z UID:5v8u223gjbj009pnoc2ked5jdn@google.com CREATED:20220324T164220Z DESCRIPTION:Title: Simulating quantum many-body phenomena with superconducting qubits \;

Speaker: Roman Kuzmin\, JQI\, UMD and NIST

Abstract: Su perconducting circuits are ubiquitous in quantum simulations\, computing\, and metrology. In this talk\, I will show a superconducting circuit platfor m extended to the extreme\, in which the circuits actually become insulatin g. Remarkably\, such nominally insulating circuits are a valuable resource. They create a tunable high-impedance environment and facilitate exceptiona lly strong interactions between photons and superconducting qubits. This op ens up new directions for analog quantum simulations of interacting many-bo dy problems\, with examples ranging from quantum phase transitions to many- body localization.

In particular\, I will start with the demo nstration of a dissipative quantum phase transition in \;a Josephson ju nction facing an Ohmic environment. \;Despite many experimental attempt s\, the existence of such a transition remains controversial. Using the hig h-impedance circuit environment\, I will present evidence of the transition with a conceptually new approach\, which relies on monitoring environmenta l degrees of freedom. A similar approach applies to analog quantum simulati ons of other strongly interacting models\, which I will illustrate on two q uantum impurity models relevant to the physics of Luttinger liquids and the Kondo effect. In the latter case\, interactions induced by a quantum impur ity in a finite size system allow us to observe the phenomenon of many-body localization. Finally\, I will argue that the high-impedance circuit platf orm can solve a variety of problems in the area of quantum condensed matter physics.

LAST-MODIFIED:20220324T171321Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220331T150000Z DTEND:20220331T160000Z DTSTAMP:20220808T214455Z UID:52fnapc8880ll7gs0f0gpu1f28@google.com CREATED:20220324T171056Z DESCRIPTION:Title: Quantum Device Benchmarking from Many- Body Quantum Chaos

Speaker: \;Joonhee Choi\, CalTec h

Recently\, there has been remarkable progress tow ards the development of large-scale quantum devices through advances in&nbs p\;quantum science and technology. This progress opens new doors for proof- of-principle demonstrations of quantum simulations as well as \;practic ally useful applications\, such as quantum-enhanced metrology and quantum n etworking. However\, these applications require first \;quantifying how well a quantum device produces a desired target state\, which is currently experimental challenging as existing methods \;for the quantitative ve rification of a quantum device require fine-tuned control and substantial e xperimental resources. In this talk\, I will \;present a simple and eff icient benchmarking protocol to estimate the fidelity of large-scale quantu m devices. Our protocol relies only on \;time evolution of a quantum sy stem undergoing Hamiltonian dynamics\, followed by simple measurements with out any sophisticated \;control and readout. Fundamentally\, this simpl ification stems from a universal phenomenon associated with many-body chaos from \;generic\, strongly interacting quantum systems. We demonstrate our benchmarking protocol experimentally for an analog quantum \;simula tor based on a Rydberg atom array\, and numerically for other quantum platf orms such as superconducting qubits\, trapped ions\, and \;itinerant pa rticles in optical lattices. \; \; < /u>

LAST-MODIFIED:20220324T171229Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T150000Z DTEND:20220329T160000Z DTSTAMP:20220808T214455Z UID:5rq8970qkp1obv3u342vkf8p7r@google.com CREATED:20220324T162229Z DESCRIPTION:Title: Quantum science with photons and atoms

Speaker: Nathan Schine\, NIST and JILA\, CU Boulder

Abstract: Can a material be made of light? Can quantum mechanics help us measure time? These are two questions in quantum science that I di rectly address using the tools of atomic physics and quantum optics. We fir st explore the requirements to make a quantum Hall material made of light. We trap photons inside of a curved-mirror non-planar optical resonator to c onfine the transverse motion of photons and imbue them with an effective ma ss and an effective magnetic field for photons. We add strong repulsive int eractions by hybridizing resonator photons with Rydberg excitations of a co ld atomic gas\, and we observe the formation of the ground state of highly correlated topological matter made of light. We next turn to a broad effort in quantum science—to help us to compute more efficiently and to measure t he world more precisely. In an optical-tweezer-trapped array of strontium a toms\, we leverage recent ideas developed in quantum information processing for related metrological goals. We demonstrate nearly a minute of atomic c oherence on an optical-frequency clock transition. We then generate metrolo gically useful entanglement between clock-transition qubits using Rydberg e xcitations\, and we show that this entanglement persists for approximately four seconds. Beyond enabling quantum-enhanced optical clocks\, this work o pens the door to studies of interacting spin and Hubbard models\, efficient computing architectures\, and database search algorithms.

Location: PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.edu.

LAST-MODIFIED:20220324T170746Z LOCATION:PSC 2136 and Zoom\; for the Zoom link\, email physchair-rsvp@umd.e du. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220328T160000 DTEND;TZID=America/New_York:20220328T173000 DTSTAMP:20220808T214455Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220328T160000 CREATED:20220131T204640Z DESCRIPTION:

Title: Quasiparticle Tunneling Suppression in Gap-Engineered Transmons


Abstract: For many superconducting qubits\, non-equili brium quasiparticles tunneling across the Josephson junction is suspected t o be one of the dominant sources of energy relaxation. This loss mechanism is expected to be suppressed \;in devices with junctions that are made from electrodes with sufficiently different superconducting gaps [1]. We ha ve designed and fabricated an asymmetric Al/AlOx/Al/Ti transmon coupled to a 3D Al cavity. To do this\, we deposited one pure Al electrode\, oxidized it\, and then deposited an Al/Ti bilayer as the counter-electrode. This pro cess forms a standard AlOx tunnel barrier\, but gives a ~100 μeV difference in superconducting gaps due to the Ti proximitizing the Al of the top laye r. Fabrication of these devices\, Giaever tunneling measurements of the sma ll Al/AlOx/Al/Ti junction\, as well as coherence measurements of the device will be discussed.

[1] Zhang\, PhD Thesis DOI: 10.13016/c516-gizd ( 2020)




In-Person Location: Toll P hysics Room # 1201
Time: 4pm -5:30pm LAST-MODIFIED:20220324T163618Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Zachary Steffen TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220411T203000Z DTEND:20220411T213000Z DTSTAMP:20220808T214455Z UID:3m68afjlaimq10mskisnl63a51@google.com CREATED:20220324T155000Z DESCRIPTION:Title: \;Cosmogenic Boosted Dark Matter

Speaker: Doo jin Kim\, Texas AM University

Abstract: The existence of dark matter (DM) in the universe is strong evidence that new physics beyond the Standa rd Model is needed to explain related phenomenology. While we know little a bout DM properties\, many well-motivated new physics models consider the mi nimal dark sector scenario\, "forgetting" other members in the dark sector. Furthermore\, DM experiments are designed and results are interpreted in t he context of the minimal dark-sector scenario. In this talk\, we argue tha t different search paradigms are needed\, given the current situation that no conclusive evidence has been found through non-gravitational interaction s of DM. As a concrete example\, we discuss models of boosted dark matter ( BDM) arising in non-minimal dark-sector scenarios and their phenomenologica l implications including detection prospects of cosmic-origin BDM signals a t terrestrial experiments and cosmic-ray experiments.

Notes: Join th e meeting at 4:15 for meet and greet.  \;Visit \;https://bit.ly/2PmJoT6 \;for access LAST-MODIFIED:20220324T155000Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220204T160000Z DTEND:20220204T170000Z DTSTAMP:20220808T214455Z UID:3po84br06ri5jt0berolhcs7ko@google.com CREATED:20220127T191545Z DESCRIPTION:Speaker: Daniel Bulmash (University of Maryla nd)
Location: Zoom
Title: \;Anomalies in (2+1)D sym metry-enriched topological phases \; \;
Abstract: \;T opological phases of matter\, like fractional quantum Hall systems\, can ho st anyon excitations with fractional electric charge. More generally\, when topological phases with anyons have global symmetries\, the anyons can car ry fractional quantum numbers under those symmetries. Remarkably\, some cho ices of fractional quantum numbers are anomalous\, that is\, they are physi cally allowed to exist\, but only when the (2+1)D system lives on the surfa ce of a bulk (3+1)D symmetry-protected topological phase like a topological insulator. Given abstract algebraic data specifying these quantum numbers\ , I will explain how to determine whether it is anomalous and\, if so\, how to describe the required bulk theory.
Host: Jiabin Yu
Zoom link: \;https://umd.zoom.us/j/3606167531?pwd=Q1 hWUC9zK2J0eXp1NzMvamtNZThDUT09

Email emartin3@umd.edu for any questions.
LAST-MODIFIED:20220324T151727Z LOCATION:Zoom SEQUENCE:2 STATUS:CONFIRMED SUMMARY:CMTC Zoom Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220324T180000Z DTEND:20220324T193000Z DTSTAMP:20220808T214455Z UID:5icbi41gg5g5r20mqiplpd0oum@google.com CREATED:20220323T223252Z DESCRIPTION:

Title: \;Magnetism in moirésuperlattices

Abstract: Moiré superlattices of 2Dmaterials is an emerging platform for studying new physical phenomena with high tunab lity. In this talk\, I will present emergent magnetic interactions in two d istinct types of moiré superlattices. I will firstly present the observatio n of magnetic textures in small angle twisted 2D magnet chromium triiodide (CrI3).Employing single-spin quantum magnetometry\, we directly visualize n anoscale magnetic domains and periodic patterns\, a signature of moiré magn etism\, and gain quantitative information on domain size and magnetization. The observed AFM and FM domains with periodic patterns are in good agreeme nt with the calculated spatial magnetic structures arising from the local s tacking-dependent interlayer exchange interactions in CrI3 moiré superlatti ces. Then I will present the drastic tuning of spin-spin exchange interacti ons in WSe2/WS2 moiré superlattices by optical excitation\, which results i n ferromagnetic order over a small range of doping at elevated temperatures . This discovery adds a new and dynamic tuning knob to the rich many-body H amiltonian of moiré quantum matter.


Host: You Zhou
 \;
Seminar on Zoom
Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848

LAST-MODIFIED:20220323T224725Z LOCATION:ZOOM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Xiaodong Xu\, UW Seattle (ZOOM) TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220330T160000Z DTEND:20220330T170000Z DTSTAMP:20220808T214455Z UID:6amcseqnsh73qepjdu5sdatk2t@google.com CREATED:20220207T165055Z DESCRIPTION:Speaker: Gianna Valentino\, Post-doctoral fellow\, A pplie Physics Lab\, John Hopkins University

Title: Tailoring Damage Pathways via Interfacial Control

Abstract: \;
Materia l selection is the cornerstone of all engineering applications. In a perfec t world\, materials would not suffer from the classical tradeoff between co mpeting properties\, but would instead possess a synergistic balance for op timal material performance. For example\, the ultimate structural material would have both high strength and ductility\, but the majority of conventio nal materials fall short of this. Metals engineered with particular interfa ces (nanotwins) have shown simultaneous ultrahigh strength and ductility\, but are limited to a relatively small subset of materials that have low sta cking fault energy such as Ag\, Cu\, and stainless steels.

This seminar w ill discuss results from the synthesis of nanotwinned nickel-molybdenum­ tu ngsten (Ni-Mo-W) alloys that possess ultrahigh strength\, highly anisotropi c plasticity\, low electrical resistivity\, and low thermal expansion that stem from the finely spaced growth twins that form during the deposition pr ocess. Combinatorial techniques were employed to sputter deposit a composit ional spread of NissMoxW1s-x\, alloys and to investigate their physical and mechanical properties as a function of alloy chemistry. The addition of Mo and W was shown to significantly decrease the coefficient of thermal expan sion and provide a route for tailoring the coefficient of thermal expansion and its temperature dependence with compositional control. Microscale mech anical testing elucidated the ultrahigh tensile and compressive strengths o f Ni­ Mo-W alloys\, underpinned by the presence of highly-aligned nanotwins and their effectiveness as obstacles to dislocation motion.

Taken as a whole\, this study highlights the balance of physical\, thermal\, and me chanical properties for Ni-Mo-W\, driven by nanoscale twin formation. Howev er\, the widespread use of nanotwinned metals is greatly limited by their s mall form factors. Additive manufacturing (AM) exposes components to far-fr om-equilibrium cooling rates and provides a great opportunity to introduce nanotwins into materials. Although still in its infancy\, a study to develo p AM nanotwins in low-stacking fault energy metals is ongoing and the resul ts will be discussed\, along with a spotlight of other novel AM materials\, such as shape memory alloys.

Bio:

Dr. Gianna Valentino is a ma terials scientist with a background in mechanics of materials and metallurg y. Her research has focused on fabricating structural materials with high s trength\, ductility\, and thermal stability via far-from-equilibrium proces sing techniques and understanding their deformation mechanisms for use in e xtreme environment applications. She has led numerous research efforts in t he development of novel metallic systems\, including nanotwinned metals\, r efractories\, and shape memory alloys. Gianna received her B.S. in Physics from Saint Joseph's University in 2014\, and her M.S. and Ph.D. in Mechanic al Engineering from Johns Hopkins University in 2016 and 2019\, respectivel y. She joined the Johns Hopkins Applied Physics Laboratory in 2020 as a pos tdoctoral fellow and holds a visiting scientist position with Johns Hopkins University.

LAST-MODIFIED:20220323T220310Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220401T200000Z DTEND:20220401T210000Z DTSTAMP:20220808T214455Z UID:3vt8kk22g1q31885p0bb79bjck@google.com CREATED:20220323T215949Z DESCRIPTION:Speaker: Dr. Paul Chirik\, Princeton University
< br>Title: Tobin J. Marks Lecture: The Organometallic Chemistry of Chemicall y Recyclable Plastics

Abstract: Plastics enable our quality of life in everything from food preservation to disposable facemasks. Since 1950\, over 9 billion tons of plastics have been synthesized. Where have they gone ? Sadly\, almost all of this plastic is still with us today and is now foun d just about everywhere on Earth—from the deepest oceans to mountaintops. W hile a kneejerk reaction may be to ban plastic\, a more thoughtful analysis reveals a more nuanced strategy is needed. My lecture will focus on the fu ndamental chemistry and catalysis required to enable a sustainable plastics age. One area of emphasis will be on the preparation of new polymer micros tructures prepared from abundant hydrocarbon building blocks such as butadi ene are chemically recyclable—re-exposure to the iron catalyst reverts the plastic to pristine monomer. The synthesis and properties of this new cyclo addition polymer and materials derived from it will be presented. A second area of emphasis is the integration of polymerization methods to prepare po lyolefins from monomers derived from CO2. The implications of th ese catalytic reactions on a new\, responsible hydrocarbon future as well a s the fundamental organometallic chemistry will be presented.
LAST-MODIFIED:20220323T220050Z LOCATION:Chemistry Building 1407 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220330T150000Z DTEND:20220330T160000Z DTSTAMP:20220808T214455Z UID:49a7r3jirjm9ebd6n3h7lqjbf9@google.com CREATED:20220207T163547Z DESCRIPTION:Speaker: Pierce Edward Van Mulbregt\, Mullin Group

Title: \;Dynamics of Rotationally and Vibrationally Excite d Molecules

Abstract: TBA - \;https://chem.umd.e du/events/literature-seminar-pierce-edward-van-mulbregt LAST-MODIFIED:20220323T215623Z LOCATION:IPST Building\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220330T193000Z DTEND:20220330T203000Z DTSTAMP:20220808T214455Z UID:35lo4f30nq5cjd1gihp701hs2q@google.com CREATED:20220323T192955Z DESCRIPTION:

LPS Seminar

Wednesday\, March 30th\, 2022\, 3:30 PM

 \;

2D THz Optoelectronics

Pro fessor Thomas Murphy\, Department of Electrical and Computer Engineering\, University of Maryland College Park



Abstract:  \;The tera hertz (THz) region of the electromagnetic spectrum spans the gap between op tics and electronics and has historically suffered from paucity of optoelec tronic devices\, in large part because of inadequate optical materials that function in this spectral range. \; Two-dimensional materials\, includ ing graphene and a growing family of related van der Waals materials\, have been shown to exhibit unusual optical and electrical properties that could enable diverse new applications in the THz regime. \; In this presenta tion\, we will present some of our own research to understand and exploit 2 D materials for THz optoelectronic applications\, including nonlinear optic al devices\, THz modulation\, and THz detection.

Bio:  \;Thomas E. Murphy received bachelors degrees in Electrical Engineering and Physics from Rice University in 1994. \; He then studied Electrical and Compute r Engineering at Massachusetts Institute of Technology\, receiving the MS d egree in 1997 and Ph.D degree in 2001. \; He was employed as a member o f the technical staff at MIT Lincoln Laboratory from 2001-2002\, and joined the faculty at the University of Maryland in 2002. \; He currently hol ds a joint appointment as a Professor in the Department of Electrical &\ ; Computer Engineering and Director of the Institute for Research in Electr onics &\; Applied Physics. \; His research interests include teraher tz and microwave photonics\, two-dimensional optoelectronics\, integrated o ptics\, nonlinear and ultrafast optics\, electrooptics\, and nonlinear dyna mical systems. \; \;

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LAST-MODIFIED:20220323T192955Z LOCATION:https://lpscp.webex.com/lpscp/j.php?MTID=md4253a6be1a43f7178491be8 adb68c86 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar: 2D THz Optoelectronics (Professor Thomas Murphy) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220321T140000Z DTEND:20220321T150000Z DTSTAMP:20220808T214455Z UID:10qad26v0pdddh962bdslip05r@google.com CREATED:20220317T195013Z DESCRIPTION:Speaker: \;Dr. Christian Baals\, T U Kaiserslautern

Title: Dynamics of ultracold Bosons in tailo red conservative and dissipative potentials

Abstract: In general\, q uantum states are very sensitive to coupling to the environment. In many ca ses this interaction leads to a loss of coherence and a transformation of t he quantum mechanical system to classical behavior. However\, quantum state s can also be stabilized if the environment and the coupling to it are appr opriately engineered. This is the basic idea of the research results that I will present in this talk.

In the first part I will show how we ext end the concept of coherent perfect absorption (CPA) to nonlinear systems. CPA is the complete extinction of bidirectional incoming radiation by a com plex potential in a wave-guiding medium\, an effect that relies on the dest ructive interference of reflected and transmitted waves. We find that the c onditions for CPA can be achieved easier than in the linear case since loca lized absorption in a non-linear medium stabilizes the system. Finally\, we experimentally demonstrate CPA for matter waves with an atomic BEC in a on e-dimensional optical lattice with an absorptive site where the absorption is introduced by an electron beam.

In the second part I will present our studies of a 3D BEC with a dark kink soliton in the presence of locali zed dissipation. By numerically solving the 3D Gross-Pitaevskii equation wi th an imaginary potential we observe the suppression of the snaking instabi lity and extract a threshold value of the dissipation strength for the stab ilization of the dark soliton. Above the stabilization threshold\, we obser ve the attractor dynamics towards the dark soliton when initially starting from a gray soliton. We find that for all initial conditions the dark solit on is the unique steady-state of the system – even when starting from the B EC ground state.

Host: Ian Spielman
LAST-MODIFIED:20220317T200328Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220328T150000Z DTEND:20220328T160000Z DTSTAMP:20220808T214455Z UID:3gpkruvbo5v9maoa4inkkpav53@google.com CREATED:20220121T183501Z DESCRIPTION:Speaker: Ken Brown\, Duke University

Title:& nbsp\;Quantum Error Correction Now!

Abstract: \;Quantum computer s have finally reached a level of complexity where real-time quantum error correction is possible. Current systems have shown an advantage using encod ed qubits for some experiments\, but no experiment has shown a decisive vic tory of encoded qubits over physical qubits. I will review the current stat e-of-the-art and then provide some lessons learned from adapting fault-tole rant quantum circuits to ion trap hardware. I will focus on the interplay o f physical noise with the quantum error correction code and discuss ways to take advantage of the noise structure through subspace selection\,
synd rome extraction methods\, and improved decoders.

Host: Joe Britton LAST-MODIFIED:20220317T195433Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220307T160000Z DTEND:20220307T170000Z DTSTAMP:20220808T214455Z UID:6vdmfopgrofov1ojd935k9j8n9@google.com CREATED:20220121T183450Z DESCRIPTION:Speaker: David Weiss\, Pennsylv ania State University

Title: \;Dynamics in 1D Bose gases

Abstract: \;I will describe the theory of generalized hydrodynamics (GH D)\, which allows the dynamics of nearly integrable many-body quantum syste ms to be accurately modeled. GHD has two assumptions: the continuum approxi mation and local equilibration to the Generalized Gibbs ensemble (GGE).&nbs p\; We use bundles of 1D Bose gases to test GHD and show that the theory wo rks remarkably well for quite a long time after even very large trap quench es and even for as few as 10 atoms per 1D gas. \; We have also performe d wavefunction quenches. For some time after such a quench the GGE is not s atisfied\, so GHD cannot be applied. \; As a function of density and co upling strength\, we experimentally study this time\, for which there are n ot robust theoretical predictions.

Host: Charles Clark
LAST-MODIFIED:20220317T195424Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T171500Z DTEND:20220329T181500Z DTSTAMP:20220808T214455Z UID:2tmdh5n18fen73t2gn12hme584@google.com CREATED:20220207T154934Z DESCRIPTION:Speaker: Professor Valeria Molinero\, Univers ity of Utah - \;http://molinero .hec.utah.edu/

Title: Towards the Elucidation of the Mechanisms of Synthesis of Ziolites


Abstract: \;Zeol ites are porous silicates that constitute the main solid catalysts used by the chemical industry. These structurally complex solids are synthesized fr om aqueous solutions through a multi-stage process that involves multiple p hase transformations mediated by the chemistry of polymerization of silica. Organic cations\, typically tetraalkylammonium ions\, are used to direct t he synthesis towards specific zeolite polymorphs. Nevertheless\, the molecu lar mechanisms by which the cations and silicates form the zeolites are not well understood. This presentation will discuss our current work using mol ecular simulations and nucleation theory to elucidate at which stage zeolit ic order emerges from the synthesis mixture\, the roles of nucleation and g rowth in the selection of zeolite polymorphs\, and what is the smallest siz e of nanozeolite that can be synthesized.


LAST-MODIFIED:20220317T170228Z LOCATION: https://go.umd.edu/statphys_zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220317T123000 DTEND;TZID=America/New_York:20220317T140000 DTSTAMP:20220808T214455Z UID:6d8mdjorlh5s5vsatbmh8lir9p@google.com RECURRENCE-ID;TZID=America/New_York:20220317T123000 CREATED:20220209T173542Z DESCRIPTION:Seminar will be conducte d via zoom: https://umd.zoom.us /j/94067038750
For those who would like\, the zoom will be streamed live in PSC 3150

Speaker: Alessandro Baroni\, LANL

Title: Qua ntum computing for Nuclear Dynamics

Abstract: Quantum Computing hold s the promise of enabling calculations of the real-time evolution of quantu m systems\, with a wide range of applications across many areas of current interest such as nuclear and particle physics. In this talk I will discuss the problem of calculating real-time response functions of quantum systems on a Quantum Computer\, focusing on problems originated in Nuclear Physics\ , such as lepton-nucleus scattering. After introducing current quantum algo rithms best suited to perform state preparation and simulation of quantum d ynamics\, I will describe their novel implementations on current gate-based quantum computers for both simple nuclear Hamiltonians and small-scale neu trino-nucleus models.
LAST-MODIFIED:20220317T140201Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220329T160000 DTEND;TZID=America/New_York:20220329T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu_R20220215T210000@google.com RECURRENCE-ID;TZID=America/New_York:20220329T160000 CREATED:20200116T204737Z DESCRIPTION:Quantum steampunk: Quantum information meets thermodynamics
Nicole Yunger Halpern
QuICS\, IPST and Dept. of Physics

Thermodyn amics has shed light on engines\, efficiency\, and time’s arrow since the&n bsp\;Industrial Revolution. But the steam engines that powered the Industri al Revolution \;were large and classical. Much of today’s technology an d experiments are small-scale\, \;quantum\, far from equilibrium\, and processing information. Nineteenth-century \;thermodynamics requir es updating for the 21st century. Guidance has come from the \;mathemat ical toolkit of quantum information theory. Applying quantum information&nb sp\;theory to thermodynamics sheds light on fundamental questions (e.g.\, h ow does \;entanglement spread during quantum thermalization? How can we distinguish quantum \;heat from quantum work?) and practicalities (e.g .\, nanoscale engines and the \;thermodynamic value of quantum coherenc es). I will overview how quantum information \;theory is being used to modernize thermodynamics for quantum-information-processing \;tech nologies. I call this combination quantum steampunk\, after the steampunk g enre of \;literature\, art\, and cinema that juxtaposes futuristic tech nologies with 19th-centurysettings. LAST-MODIFIED:20220317T130424Z LOCATION: 1412 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220411T150000Z DTEND:20220411T160000Z DTSTAMP:20220808T214455Z UID:3h25q2279hrcaq5566nqir9sg5@google.com CREATED:20220121T183530Z DESCRIPTION:Speaker: Nader Engheta\, Univer sity of Pennsylvania

Title: \;Near-Zero-Index Optics
< br>Abstract: Materials are often used to manipulate and control photons.&nb sp\; Metamaterials -- judiciously engineered material structures -- have en abled scientists and engineers to construct platforms with unconventional m aterial parameters\, providing exciting opportunities for optical and micro wave devices and components. One such platform is the near-zero-index metam aterials. \; In such structures\, the effective relative permittivity a nd/or relative permeability is designed to be near zero at operating freque ncies\, causing the effective refractive index to be near zero. \; Cons equently\, in such epsilon-near-zero (ENZ)\, mu-near-zero (MNZ)\, and/or ne ar-zero-index (NZI)structures the wavelength is “stretched”\, and therefore the phase distribution is effectively uniform throughout this volume.  \;This leads to a variety of unique features in wave physics including supe rcoupling\, photonic doping\, photonic surface states\, electric levitation \, extreme quantum optics\, thermal beaming\, and giant nonlinearity\, just to name a few. \; In this talk\, I will present an overview of some of the fundamental principles and unique physics and engineering of wave inte raction with such near-zero-index structures.  \;I will then discuss so me of the applications of such platforms in photonics and microwave technol ogies and in some quantum phenomena.  \;Possible future directions of r esearch in this field will also be forecasted.

Short B io: Nader Engheta is the H. Nedwill Ramsey Professor at the University of P ennsylvania in Philadelphia\, with affiliations in the Departments of Elect rical and Systems Engineering\, Physics and Astronomy\, Bioengineering\, an d Materials Science and Engineering. \; He received his BS degree from the University of Tehran\, and his MS and Ph.D. degrees from Caltech. \ ; His current research activities span a broad range of areas including pho tonics\, metamaterials\, electrodynamics\, microwaves\, nano-optics\, graph ene photonics\, imaging and sensing inspired by eyes of animal species\, mi crowave and optical antennas\, and physics and engineering of fields and wa ves.

He is a Fellow of n ine international scientific and technical organizations\, i.e.\, IE EE\, OPTICA\, APS\, MRS\, SPIE\, URSI\,AAAS\, IOP and NAI. \; He has re ceived the honorary doctoral degrees from the Aalto University in Finland i n 2016\, the University of Stuttgart\, Germany in 2016\, and Ukraine’s Nati onal Technical University Kharkov Polytechnic Institute in 2017.

Host: C harles Clark LAST-MODIFIED:20220311T213539Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220316T193000Z DTEND:20220316T203000Z DTSTAMP:20220808T214455Z UID:5c50d8b5vo5n0h9i27hnn15fd0@google.com CREATED:20220310T214714Z DESCRIPTION:Title : Neutral-plasma interaction and the Boltzmann collision operator \n\n Speaker Name: George Wilkie\n\n Speaker Institution : PPPL\n\ n Abstract : Neutral atoms and molecules play a critical role in the magnet ic confinement recycling process and in protecting plasma-facing components from extreme plasma heat flux. Predicting their behavior from first princi ples requires direct numerical solution of the Boltzmann transport equation . Monte Carlo methods for doing so are robust and efficient\, especially in the linear and high Knudsen number regimes. An overview of this method\, p resent tools and applications will be presented. Special attention will be paid to the challenges of coupling to first-principles kinetic plasma model s. In order for Monte Carlo to efficiently handle nonlinear processes such as neutral-neutral elastic scattering or charge exchange with non-Maxwellia n ions\, simplified collision operators are often used for good reasons tha t will be discussed. An alternative conservative spectral method is present ed to rigorously handle nonlinear collision operators efficiently in the tr ansition regime\, along with several benchmarks against analytic models and other simulation tools. LAST-MODIFIED:20220310T214714Z LOCATION:Energy Research Facility\, Room 1207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220317T180000Z DTEND:20220317T190000Z DTSTAMP:20220808T214455Z UID:49jm6krka3uuf80it0h1i9e3eo@google.com CREATED:20220310T152151Z DESCRIPTION:Title: Geometry of Banach spaces: a new rout e towards Position Based Cryptography
Speaker: Aleksander Kubicki (Unive rsity Complutense of Madrid)
Time: Thursday\, March 17\, 2022 - 2:00pmLocation: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/99750827019

In this talk I wi ll explain how some techniques coming from the local theory of Banach space s can be used to obtain claims about the security of protocols for Position Based Cryptography. In particular\, I will show how the knowledge about ce rtain geometrical properties of particular Banach spaces (tensor norms on t ensor products of Hilbert spaces) can be translated into lower bounds on th e resources needed for cheating in this cryptographic task. I will finish p ointing out some open problems and future directions suggested by our work. The contents of the talk are based on arXiv:2103.16357 (joint work with M. Junge\, C. Palazuelos and D. Pérez-García).

(In perso n viewing at 3100A Atlantic Building)
LAST-MODIFIED:20220310T211502Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/99750827019 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Aleksander Kubicki TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220314T190000Z DTEND:20220314T203000Z DTSTAMP:20220808T214455Z UID:2te6n0tij7d00f8iomh5blm9hq@google.com CREATED:20220124T160119Z DESCRIPTION:Speaker: Ken Van Tilburg\, NYU/CCA

Title: Ste llar Basins

Abstract: I will describe the phenomenology of stellar b asins: volumetric stellar emission into gravitationally bound orbits of wea kly coupled particles such as axions\, moduli\, hidden photons\, and fermio ns. While only a tiny fraction of the instantaneous luminosity of a star (t he vast majority of the emission is into relativistic modes)\, the continua l injection of these particles into a small part of phase space causes them to accumulate over astrophysically long time scales\, forming a "stellar b asin"\, in analogy with the geologic kind. The energy density of the Solar basin can surpass that of the relativistic Solar flux at Earth's location a fter only a million years\, for a sufficiently long-lived particle produced through an emission process whose matrix elements are unsuppressed at low momentum. I will also discuss ongoing N-body simulations of the Solar basin \, and preliminary results on both indirect detection and recasted direct d etection searches for basin particles around the Sun.

Seminar will a lso be streamed live via zoom\, for zoom link please email mknouse@umd.edu< /html-blob>

LAST-MODIFIED:20220310T153019Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220318T173000Z DTEND:20220318T183000Z DTSTAMP:20220808T214455Z UID:7bspugrg75rsrvbbh15a32433r@google.com CREATED:20220303T154541Z DESCRIPTION:

Alex Pomarol\, University of B arcelona *Special Seminar*

Will be preceded by virtual lunch at 12:3 0pm

Title: Small instantons and the axion mass

Abstract: I wi ll discuss the sensitivity of the axion mass on UV modifications of QCD. In particular\, I will consider contributions from small instantons to the ax ion mass in the case in which gluons propagate in some extra dimension at h igh energies. In the case of a d=5 AdS space\, this is expected to be simil ar to QCD interacting with an additional  \;(strongly-coupled) colored sector. Contrary to expectations\, I will show that small instantons are su ppressed\, and only UV localized instanton-anti-instanton contributions can be sizeable. For flat extra dimensions\, I will show that small instantons can be enhanced by power-law corrections due to the presence of the Kaluza -Klein states.

Seminar will be conducted via zoom\, for link please email: mknouse@umd.edu LAST-MODIFIED:20220309T165929Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:**Special Joint Cornell/ UMD Seminar** TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220303T123000 DTEND;TZID=America/New_York:20220303T140000 RRULE:FREQ=WEEKLY;UNTIL=20220414T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20220303T123000 EXDATE;TZID=America/New_York:20220310T123000 EXDATE;TZID=America/New_York:20220317T123000 EXDATE;TZID=America/New_York:20220324T123000 EXDATE;TZID=America/New_York:20220331T123000 DTSTAMP:20220808T214455Z UID:7h00ho737srmmhugt5dklv91t3@google.com CREATED:20220308T204846Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom .us/j/94067038750

Speaker: \;Lena Funcke\, MIT

Title and abstract: tk
LAST-MODIFIED:20220308T204858Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220303T123000 DTEND;TZID=America/New_York:20220303T140000 RRULE:FREQ=WEEKLY;UNTIL=20220407T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20220324T123000 EXDATE;TZID=America/New_York:20220317T123000 EXDATE;TZID=America/New_York:20220310T123000 EXDATE;TZID=America/New_York:20220303T123000 DTSTAMP:20220808T214455Z UID:7kricndssf147v6c22iib09spd@google.com CREATED:20220308T204637Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom .us/j/94067038750

Speaker: Nikhil Karthik\, JLab

Title and ab stract: tk
LAST-MODIFIED:20220308T204734Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220331T180000Z DTEND:20220331T193000Z DTSTAMP:20220808T214455Z UID:0v5j54dik2cptcn886i98ocojk@google.com CREATED:20220308T184602Z DESCRIPTION:
Title: The rich physics of a square lattice: correlations a nd topology in the Eu(Al\,Ga)4 compounds

Abstract: \;Topological materials have been at the forefront of condensed matter research for more than a decade\, and continue to reveal novel physics. More recently\, corr elated topological materials have added a new level of complexity to our un derstanding of emergent phenomena in quantum materials. Taking a look back of some “old” compounds with the lens of topology is one way of finding suc h new physics. In this talk\, I will revisit the class of Eu-based square l attice compounds Eu(Al\,Ga)4\, where complex magnetic order was first disco vered several years ago. In particular\, the EuAl2Ga2 member of this series shows multiple non-collinear spin texture states below TN. One of these is likely a skyrmion state\, as suggested by neutron diffraction and topologi cal Hall effect measurements. I will discuss the possible relation between the incommensurate charge density wave (CDW) and the non-collinear spin tex tures in the centrosymmetric Eu(Al\,Ga)4 series\, when comparing the EuAl2G a2 properties with those of the end compounds EuGa4 and EuAl4: a CDW is obs erved in EuAl2Ga2\, but not it the EuGa4 analogue\, where the magnetic orde r is just a collinear antiferromagnetic state. Remarkably\, magnetization\, quantum oscillations and ARPES measurements\, together with band structure calculations\, show evidence for topological Weyl nodal lines and a topolo gical phase transition in EuGa4. \;

Host: Jeffrey Lynn
 \ ;
Location: Toll Physics Rm 1201
Time: 2pm - 3:30pm

Seminar al so on Zoom
Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848 LAST-MODIFIED:20220308T184706Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Emilia Morosan - Rice University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220328T203000Z DTEND:20220328T213000Z DTSTAMP:20220808T214455Z UID:63nr9cfdbhs8r92vrk19dis2j6@google.com CREATED:20220308T162933Z DESCRIPTION:Title: \;Extreme AGN outbursts in galaxy cluster s

Speaker: Simona Giacintucci\, Naval Research Laboratory

Abs tract: Clusters of galaxies are the largest\, gravitationally-bound structu res in the Universe. The space between the galaxies is filled by hot ionize d gas -- the intra-cluster medium (ICM) -- that emits X-ray radiation. In t he cores of many clusters\, the ICM is dense enough to cool very rapidly\, on a timescale shorter than the cluster’s lifetime. This cooling process sh ould deposit large amounts of cold gas in the cluster centers. However\, th ere is little evidence for such vast quantities of cool gas\, suggesting a compensatory source of heat. The favored mechanism is heating by the Active Galactic Nucleus (AGN) harbored in the cluster’s central galaxy. AGN jets blow radio bubbles and inject copious amounts of energy into the ICM in the form of relativistic plasma as well as mechanical energy. Signs of AGN act ivity (e.g.\, X-ray cavities filled by the radio bubbles) are seen in most cluster cores. However\, the precise mechanism by which the AGN heats the I CM is still unclear. Complicating the picture is the recent finding that th e most powerful AGN outbursts observed in the X-rays appear to deposit most of their energy at a certain distance from the center\, outside the region of rapid cooling. A spectacular example is the Ophiuchus cluster\, where a giant (~500 kpc across) cavity in the X-ray gas has been created by the bl ast of an extremely energetic AGN outburst occurred a few hundred million y ears ago. In this talk\, I will present new deep radio and X-ray images of this exceptional fossil of the most energetic AGN outburst seen in any gala xy cluster. It may be an early example of a new class of sources to be unco vered by deeper radio and X-ray observations of galaxy clusters.


Notes: \;Join the meeting at 4:15 for meet and gree t.  \;Visit https://bit.ly/2PmJoT6< /u> \;for access
LAST-MODIFIED:20220308T162958Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220310T123000 DTEND;TZID=America/New_York:20220310T140000 DTSTAMP:20220808T214455Z UID:6d8mdjorlh5s5vsatbmh8lir9p@google.com RECURRENCE-ID;TZID=America/New_York:20220310T123000 CREATED:20220209T173542Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/94067038750

Speaker: Caroline Robin\, Universitat Bielefeld

Title: E ntanglement in nuclear structure calculations

Abstract: In the past years\, increasing effort has been devoted to better understand the
phen omenon of entanglement in quantum many-body systems\, due to its essential< br>role in quantum computing and potential guidance in formulating the many -body
problem. While extensive investigations of this topic have already been performed in
condensed matter\, atomic physics and quantum chemist ry\, the exploration of
entanglement in nuclear systems has only recentl y begun.
In this talk I will present studies of entanglement in the stru cture of light nuclei. In
particular\, I will show how different entangl ement patterns can arise from different
many-body calculation schemes\, and how such patterns are related to convergence
of observables\, such a s the binding energy. I will also investigate how entanglement
structure s can signal emergent properties and physical phenomena in the nuclei
un der study. Finally\, I will discuss how such studies could lead to more eff icient
many-body schemes\, and how they could benefit the development of quantum
computations of nuclei.
LAST-MODIFIED:20220308T161408Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220308T160000 DTEND;TZID=America/New_York:20220308T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu_R20220215T210000@google.com RECURRENCE-ID;TZID=America/New_York:20220308T160000 CREATED:20200116T204737Z DESCRIPTION:Speaker Aida X. El-Khadra\, Professor of Physics\, Univ. of Ill inois at Urbana-Champaign \;  \;  \;  \;  \;  \; &n bsp\;  \;
Title: \;The dance of the muon

Abstract :
More than eighty years after the muon was first discovered\, it is sti ll a source of mystery. \;Indeed\, several experiments are underway or planned that use muons as a window to search for new physics — a central go al of the high energy physics community. \;In an exciting development\, last year's announcement by the Fermilab experiment of it's first measurem ent result sharpens the long-standing tension between \;experiment and theory for the muon’s magnetic moment to \;4.2 standard deviations. The Fermilab experiment's measurement uncertainty will continue to improve\, w ith the ultimate goal of reducing it by a factor of four. \;In addition \, a planned experiment in Japan will provide a completely independent meas urement of this quantity. After a brief tour of its history\, I will discus s the ongoing interplay between theory and experiment that is essential for unlocking the discovery potential of this effort.

Host: Zohreh Davo udi LAST-MODIFIED:20220308T160957Z LOCATION: 1412 John S. Toll Physics Building\, College Park SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220311T200000Z DTEND:20220311T210000Z DTSTAMP:20220808T214455Z UID:2v3qbafev5303k97ordvjh663o@google.com CREATED:20220307T182922Z DESCRIPTION:
JSI Online Colloquium: Friday March 11\, 3:00-4:00

S peaker: Dr. Rostrom Mbarek\, University of Chicago and 2022 Gehrels \;F ellow

Title: \;Particle Acceleration in Active Galactic Nu clei: From the Large Structures of Jets to the Kinetic Scale of Plasma Turb ulence


Abstract: \;
The origin of Ultra-High-Energy Cosmic Rays (UHECRs) and the highest-ener gy astrophysical neutrinos remains as one of the most prominent unresolved questions in astrophysics. We can shed light on such phenomena employing a thorough bottom-up approach to understand the spectra of UHECRs\, neutrinos \, and eventually x/gamma-rays from Active Galactic Nucleus (AGN) jets. In this respect\, I will initially discuss an original theory of particle acce leration in AGN jets\, i.e.\, the espresso mechanism\, that we back by prop agating protons and heavier elements in relativistic 3D MHD simulations of AGN jets accounting \;self-consistently \ ;for i) particle injection\, ii) particle acceleration\, iii) spectra of UHECRs\, iv) effects of losses on UHECRs\, and v) the resul ting neutrino spectral features. Moving from the global scale of jets to th e kinetic scales of the plasma\, I will also present the first steps in und erstanding asymmetric reconnection in the relativistic regime using Particl e-in-Cell (PIC) simulations. Considering the turbulent nature of AGNs\, asy mmetric reconnection can potentially be the main driver of nonthermal lepto n acceleration\, and thus nonthermal radiation\, important to modeling UHEC R losses and neutrino production. I will finally touch upon the interplay o f these two regimes and potential ways of combining them.
< br>
Zoom link:
https://umd.zoom.us/j/9 6995439999?pwd=VHZjaWlQZlFhZnV3ejlWSGtxbHdXdz09
passcode:& nbsp\; \;692858 LAST-MODIFIED:20220307T182922Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JSI Online Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220315T150000Z DTEND:20220315T160000Z DTSTAMP:20220808T214455Z UID:5m4352sg887n0pp74uroqnpntn@google.com CREATED:20220207T174913Z DESCRIPTION:Speaker: Dr. Nathan Baird\, University of the Scienc es

Title: Dynamic Intramolecular RNA Triplexes: Transcript Stability Elements and Small Molecule Targets


Abstract: \;https://chem.umd.edu /events/speaker-nathan-baird
LAST-MODIFIED:20220307T152803Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220317T190000Z DTEND:20220317T200000Z DTSTAMP:20220808T214455Z UID:2igbs5hfjp9jsmumiff98ee58g@google.com CREATED:20220307T150213Z DESCRIPTION:Speaker: Bowen Shen\, UMCP

Title: Literature Seminar

Abstract: \;https://chem.umd.edu/events/liter ature-seminar-bowen-shen LAST-MODIFIED:20220307T150213Z LOCATION:IPST Building\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220317T150000Z DTEND:20220317T160000Z DTSTAMP:20220808T214455Z UID:6alo8p6h9t4mb41v36hc282dsf@google.com CREATED:20220207T175205Z DESCRIPTION:Speaker: Luan Hoang\, Vo\, UMCP

Title: Litera ture Seminar


Abstract: \;https://chem.umd.edu/events/lite rature-seminar-luan-hoang-vo
LAST-MODIFIED:20220307T150019Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220322T160000 DTEND;TZID=America/New_York:20220322T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu_R20220215T210000@google.com RECURRENCE-ID;TZID=America/New_York:20220322T160000 CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220307T145012Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Spring break\; no Physics colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220315T160000 DTEND;TZID=America/New_York:20220315T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu_R20220215T210000@google.com RECURRENCE-ID;TZID=America/New_York:20220315T160000 CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220307T144935Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:No Physics colloquium today TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220316T160000Z DTEND:20220316T170000Z DTSTAMP:20220808T214455Z UID:1jgs2c7got384p1bqv1qpjo2k3@google.com CREATED:20220207T164947Z DESCRIPTION:Speaker: Suhas Eswarappa Prameela\, Post-doctoral Scholar\, Hop kins Extreme Materials Institute (HEMI)\, John Hopkins University

Ti tle: Design of Advanced Materials for Extreme Dynamic Environments

A bstract: The microstructure of today’s metallic alloys and composites is st eadily rising in complexity because of increasing demands in performance. D esigning better materials for extreme dynamic environments has benefits cut ting across many areas: automobile frames\, vehicle/body armor protection p arts\, aircraft components\, satellite systems\, and multifunctional hypers onic structures. In this talk\, I will describe our design of unique thermo -mechanical processing pathways for several model Mg alloys\, where nucleat ion-controlled kinetics dominate the microstructural evolution. Synergistic experimental and computational efforts unravel fundamental ways to strateg ically tune atomic-scale defects to generate fine solute clusters and achie ve a high density of nanoscale precipitates. These novel microstructures sh ow great promise in dramatically improving Mg alloy properties across diver se\, dynamic environments. Within this presentation\, I will also highlight the Materials and Data for Extreme Environments (MDEE) project\, a new mat erials informatics effort for enabling the high-throughput inverse design a nd manufacturing of advanced materials.

Bio:

Suhas Eswarappa Pramee la is a post-doctoral scholar at Hopkins Extreme Materials Institute (HEMI) \, Johns Hopkins University. He is currently a member of Materials in Extre me Dynamic Environments (MEDE) and Materials Science for Extreme Environmen ts (MSEE) research consortia. Prameela's dissertation work has been recogni zed by the People’s choice-Best Poster Award at the Mach conference and fea tured in Nature Reviews Physics. His research interests span metallurgy\, h igh-throughput materials discovery for extreme environments\, mechanical be havior across length scales\, sustainable materials\, metal additive manufa cturing\, and materials informatics. He obtained his Ph.D. (Materials Scien ce and Engineering) from Johns Hopkins University\, and his M.S. in Materia l Science and Engineering from Arizona State University. Several accolades have recognized his diversity and outreach efforts\, including op-eds in pr estigious journals such as Nature\, Science and Nature Materials.

LAST-MODIFIED:20220307T144509Z LOCATION:2110 CHE (and via Zoom) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220316T150000Z DTEND:20220316T161500Z DTSTAMP:20220808T214455Z UID:3c96qmsqjq8vc0m5k570ld7u0m@google.com CREATED:20220303T162638Z DESCRIPTION:Title: Capacity and Quantum Geometry of Parametrized Qu antum Circuits
Speaker: Tobias Haug (Imperial College)
Time: Wednes day\, March 16\, 2022 - 11:00am
Location: ATL 3100A and Virtual Via Zoo m: https://umd.z oom.us/j/5037655723  Meeting ID: 503 765 5723

To harness the pot ential of noisy intermediate-scale quantum devices\, it is paramount to fin d the best type of circuits to run hybrid quantum-classical algorithms. Key candidates are parametrized quantum circuits that can be effectively imple mented on current devices. Here\, we evaluate the capacity and trainability of these circuits using the geometric structure of the parameter space via the effective quantum dimension [1]. We find that the capacity exhibits sc aling laws and striking differences depending on the type of entangling gat es used. Based on our methods\, we propose an initialization strategy where the circuit is expressive but does not suffer from barren plateaus. Furthe r\, we identify a transition in the quantum geometry when the circuit becom es overparameterized. Finally\, we show an algorithm that prunes redundant parameters of a circuit without affecting its effective dimension. Our resu lts enhance the understanding of parametrized quantum circuits and can be i mmediately applied to improve variational quantum algorithms.

[1] To bias Haug\, Kishor Bharti\, and M.S. Kim PRX Quantum 2\, 040309 (2021)


https://umd.zoom.us/j/5037655723

Meeting ID: 503 765 5723
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< /u> LAST-MODIFIED:20220303T162638Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/5037655723 Meeting ID: 503 765 5723 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Tobias Haug TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220311T180000Z DTEND:20220311T184500Z DTSTAMP:20220808T214455Z UID:7qjnca85djiidf4obabdo1brjq@google.com CREATED:20220303T152445Z DESCRIPTION:Title: Simulating the Schwinger Model and Testing S ymmetry Protection with Trapped Ions
Speaker: Nhung Nguyen (JQI)
Time : Friday\, March 11\, 2022 - 1:00pm
Location: ATL 2324 and Virtual Via Z oom: https://umd.zoom.us/j/9616 0177762

Gauge theory is a powerful theoretical framework for und erstanding the fundamental forces in the standard model. Simulating the rea l time dynamics of gauge theory\, especially in the strong coupling regime\ , is a challenging classical problem.  \;Quantum computers offer a solu tion to this problem by taking advantage of the intrinsic quantum nature of the systems. The Schwinger model\, that is the 1+1 dimensional U(1) gauge theory coupled to fermions\, has served as a testbed for different methods of quantum simulation. Using a trapped-ion system with up to six qubits\, w e simulate the real-time dynamics of pair creation in the lattice Schwinger model\, the Schwinger model with discretized space dimension\, for times m uch longer than previously accessible. In this talk\, I will discuss the in tegrated theoretical\, algorithmic\, and experimental approach we used to a chieve this result. Specifically\, I will compare the gate requirement for two formulations of the model using the Suzuki-Trotter product formula\, an d explain the trade-off  \;between errors from the ordering of the Hami ltonian terms\, the Trotter step size\, and experimental imperfections. I w ill also present the result regarding the effectiveness of a recently propo sed symmetry-protection protocol by Tran et. al. and a symmetry-inspired po st-selection scheme for mitigating experimental errors.

(Pizza and r efreshments will be served after the talk.)
LAST-MODIFIED:20220303T155543Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Nhung Nguyen TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220307T200000Z DTEND:20220307T213000Z DTSTAMP:20220808T214455Z UID:4ir7i7ol8mmps35lodjjr7ugp9@google.com CREATED:20220118T150443Z DESCRIPTION:Speaker: Cari Cesarotti\, Harvard

Title: Prob ing Dark Gauge Forces with a High-Energy Muon Beam Dump

Abstract:&nb sp\;We propose a new beam dump experiment at a future TeV-scale muon collid er. A beam dump would be an economical and effective way to increase the di scovery potential of the collider complex in a complementary regime. In thi s work we consider vector models such as the dark photon and $L_\\mu-L_\\ta u$ gauge boson as new physics candidates and explore which novel regions of parameter space can be probed with a muon beam dump. We find that for the dark photon model\, we gain sensitivity in the moderate mass (MeV--GeV) ran ge at both higher and lower couplings compared to existing and proposed exp eriments\, and gain access to previously untouched areas of parameter space of the $L_\\mu-L_\\tau$ model.
LAST-MODIFIED:20220303T152446Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220310T190000Z DTEND:20220310T203000Z DTSTAMP:20220808T214455Z UID:3avdf2j2kukrh433n8pdhmm91u@google.com CREATED:20220222T163549Z DESCRIPTION:Title: Carbon-based clathrates as a new class of diamond-like framework materials.

Abstract: \;Clathrates are polyhedral cage-based structures found throughout nature in tetrahedral sy stems \;such as water\, silica\, silicon and germanium. But despite pre dictions spanning >\;50 years\, carbon-based clathrates have remained elu sive. If made\, carbon clathrates would represent diamond-like materials wi th high hardness and strength\, but also offer the possibility for highly t unable electronic structures via guest atom doping within cages. Recently w e have predicted and synthesized the first carbon-based clathrates using a chemical stabilization strategy of boron substitution combined with high-pr essure techniques. We synthesized several unique clathrates based on the bi partite sodalite structure with compositions 1M3B3C (where M = di or trival ent metal). These structures are highly incompressible due to the covalent nature of sp3-hybridized \;B-C bonding\, and the electronic structure i s tunable from semiconductor to metal depending on the valence of the guest atoms. \; For the case of SrB3C3\, in situ electrical transport measur ements\, facilitated by a novel experimental design compatible with extreme synthesis conditions (i.e.\, >\;3000 K at 50 GPa)\, show non-hysteretic resistivity drops that track the calculated magnitude and pressure dependen ce of Tc calculated using the Allen-Dynes modified McMillan equation with C oulomb pseudopotential values (mu*) near 0.15. \; The superconducting n ature of the transition (Tc ≈ 20 K) was confirmed via electrical transport measurements collected under applied magnetic fields up to 18 T. Carbon-bor on clathrates thus represent a new class of superconductors that are simila r to covalent metals like MgB2 and doped fullerenes. Carbon clathrates shar e structures similar with superconducting superhydrides\, but covalent C–B bonds allow metastable persistence at ambient conditions. Different guest a tom substitution schemes in various carbon clathrate structure types may en able conventional superconductivity with Tc approaching 100 K. \; \ ;

Host: Paglione
 \;

Seminar <\;In Per son>\;
Location: 1201 John S. Toll Physics Bldg
Time: 2:00pm - 3:30pm
Broadcast Zoom Link: \;  \;https://umd.zoom.us/j /91301075848
LAST-MODIFIED:20220303T144656Z LOCATION:Toll Physics Rm 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Timothy Strobel\, Carnegie Institute for Science TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220310T160000Z DTEND:20220310T170000Z DTSTAMP:20220808T214455Z UID:6o050ugfa71ab6gr3gadj0726l@google.com CREATED:20220207T174734Z DESCRIPTION:Speaker: Chris Hendon\, University of Oregon

Title: Defects and Doping in Metal-organic Frameworks

Abstract: Alth ough generally thought of as highly ordered crystals\, all metal-organic fr ameworks contain defects. Some defects may reveal catalytic active sites or hint at competing material phases\, while others may result in electronic doping. Modern computational approaches are well-suited to studying the eme rgent chemistry of these imperfections\, and can be used to directly inform experiment and characterization of materials with properties that diverge from those gleaned from crystallography. This talk discusses the chemistry afforded by defects in metal-organic frameworks\, with a focus on structura l dynamics and adatoms\, both promoted by Lewis basic sites within the scaf folds. The utility of these defects will be presented from the perspective of heterogeneous catalyst development.
LAST-MODIFIED:20220303T141907Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220308T181500Z DTEND:20220308T191500Z DTSTAMP:20220808T214455Z UID:6ac5qntpheke6har9ds3mnka5b@google.com CREATED:20220207T160511Z DESCRIPTION:Speaker: Dr. Peter Battaglia\, DeepMind
Title: Physical Inductive Biases for Learned Simulation and Scientific Di scovery


Abstract: \;This talk will explore both how o ur knowledge of physics can improve our machine learning approaches\, and h ow our machine learning tools can be used to improve our knowledge of physi cs. I'll describe work my collaborators and I have done using particle- and mesh-based approaches for learning simulation\, how we leverage inductive biases about ODEs\, Hamiltonian and Lagrangian mechanics in learned simulat ors\, and how we can use neural networks with symbolic regression to discov er physical governing equations from simulated and real data.


LAST-MODIFIED:20220303T140244Z LOCATION:https://go.umd.ed/statphys_zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220303T190000Z DTEND:20220303T200000Z DTSTAMP:20220808T214455Z UID:4b543c7j42qslnpaie1ftbg79t@google.com CREATED:20220225T013227Z DESCRIPTION:Title: Random quantum circuits transform loc al noise into global white noise
Speaker: Alexander Dalzell (Caltech / AWS)
Time: Thursday\, March 3\, 2022 - 2:00pm
Location: ATL 3100A an d Virtual Via Zoom:  \;http s://umd.zoom.us/j/95750508288

We examine the distribution over m easurement outcomes of noisy random quantum circuits in the low-fidelity re gime. We will show that\, for local noise that is sufficiently weak and uni tal\, the output distribution p_noisy of typical circuits can be approximat ed by F*p_ideal + (1−F)*p_unif\, where F is the probability that no local e rrors occur\, p_ideal is the distribution that would arise if there were no errors\, and p_unif is the uniform distribution. In other words\, local er rors are scrambled by the random quantum circuit and contribute only white noise (uniform output). Importantly\, we upper bound the total variation er ror (averaged over random circuit instance) in this approximation and show it grows with the square root of the number of error locations (rather than linearly). The white-noise approximation is useful for salvaging the sign al from a noisy quantum computation\; it was an underlying assumption in co mplexity-theoretic arguments that low-fidelity random quantum circuits cann ot be efficiently sampled classically. Our method is based on a map from se cond-moment quantities in random quantum circuits to expectation values of certain stochastic processes for which we compute upper and lower bounds.



(In person v iewing at 3100A Atlantic Building)
LAST-MODIFIED:20220301T191411Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/95750508288 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Alexander Dalzell TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220316T173000Z DTEND:20220316T190000Z DTSTAMP:20220808T214455Z UID:3kou831fbnf46j2mc4fnp1flca@google.com CREATED:20220210T154703Z DESCRIPTION:
Seminar will be conducted via zoom.
Speaker: David London\, University of Montreal \;

Title: Anoma lies in B Decays: A Sign of New Physics?

Abstract: At present\, ther e are several measurements of observables in B decays that disagree with
the predictions of the Standard Model. These can be separated into two cla sses of decays\,
those involving b → sμ+μ− or b → c`ν ̄` transitions. Th e size of the deviations varies from
∼ 2σ to >\;∼ 4σ. We may be seeing signs that new physics (NP) is present in these decays. In
this talk\, I will review these anomalies\, focusing on their dependence (or not) on th eoretical
input. I will discuss the possible NP explanations\, as well a s ways of distinguishing these
NP models.

For zoom link please em ail mknouse@umd.edu
LAST-MODIFIED:20220301T171747Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Online Joint JHU/ UMD Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220303T123000 DTEND;TZID=America/New_York:20220303T140000 DTSTAMP:20220808T214455Z UID:6d8mdjorlh5s5vsatbmh8lir9p@google.com RECURRENCE-ID;TZID=America/New_York:20220303T123000 CREATED:20220209T173542Z DESCRIPTION:

Speaker: Jack Holligan\, UMD

T itle: \;Symplectic Yang-Mills on the lattice

Seminar will also be streamed live via zoom: \; \;https://umd.zoom.us/j/94067038750
LAST-MODIFIED:20220301T151454Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220302T203000Z DTEND:20220302T214500Z DTSTAMP:20220808T214455Z UID:35dfqpqslc12bnuit757jtc5s5@google.com CREATED:20220228T183037Z DESCRIPTION:Molecular Coupling Competing wi th Defects Within Insulator of the \;Magnetic Tunnel Junction-based Molecular Spintronics Devices
Pawan Tyagi*\, Hayden Brown\, Andrew G rizzle\, Christopher D'Angelo\, Bishnu R. Dahal\,
Center for Nanotec hnology Research and Education\, Mechanical Engineering\, University of the District of Columbia\, Washington DC-20008\, USA
Corresponding Author E mail: \;ptyagi@udc.edu
 \ ;
ABSTRACT: \;Nearly 70 years old dream of incorporating molecule as the device element is still challenged by competing defects in almost every experimentally tested molecular device approach. This paper fo cuses on the magnetic tunnel junction (MTJ) based molecular spintronics dev ice (MTJMSD) method. An MTJMSD utilizes a tunnel barrier to ensure a robust and mass-producible physical gap between two ferromagnetic electrodes.&nbs p\; Molecular device channels are covalently bonded between two ferromagnet s across the insulating barrier. Our prior studies showed that molecule ind uced strong coupling produced several anomalous attributes at room temperat ure-including current suppression1\, spin photovoltaic effect2\, large resistance change3\, and highly corre lated magnetic systems4\, \;5. MTJMSD approach may benefit from MTJ's industrial p ractices\; however\, the MTJMSD approach still needs to overcome additional challenges arising from the inclusion of magnetic molecules in conjunction with competing defects6. An insulating barrier may possess a variety of potential def ects arising during the fabrication or operational phase. This paper descri bes an experimental and theoretical study of molecular coupling between fer romagnets in the presence of the competing coupling via an insulating tunne l barrier. We discuss the experimental observations of hillocks and pinhole -type defects producing inter-layer coupling that compete with molecular de vice elements. We performed theoretical simulations to encompass a wide ran ge of competition between molecules and defects. Monte Carlo Simulation was used for investigating the defect-induced inter-layer coupling on MTJMSD. Our research may help understand and design molecular spintronics devices u tilizing various insulating spacers such as aluminum oxide(AlOx) and magnes ium oxide (MgO) on a wide range of metal electrodes. This paper intends to provide practical insights for researchers intending to investigate the mol ecular device properties via the MTJMSD approach and do not have a backgrou nd in magnetic tunnel junction fabrication. We are endeavoring to utilize M TJ Testbed to harness quantum properties of paramagnetic molecules and solv ing molecular spintronic device fabrication roadblocks.
 \; \;Bi ography
Prof. Pawan Tyagi's expertise is in the area of integrating nano materials into devices and sensors for advancing futuristic computer techno logy\, biomedical devices\, energy technology\, and advanced manufacturing. He has made a seminal contribution in the area of tunnel junction-based mo lecular spintronics devices. Prof. Tyagi has obtained patent in a new appro ach of making molecular devices. He has also made a significant contributio n in the surface improvement of complex metal additive manufacturing compon ents and collaboratively resaerch with numerous Department of Energy Indust ries. He is also a founding director of the NSF-funded Center for Nanotechn ology Research and Education(CNRE). Prof. Tyagi leads a consortium of four universities and three DOE-NNSA industries to develop resaerch driven techn ologically advanced workforce. He has founded UDC Nanoscale Fabrication and Measurement Laboratory (NFML) to support undergraduate to postdoctoral sch olar training. At the University of the District of Columbia\, he serves as the founder and director of the Nanotechnology Application Laboratory and leads several federally funded projects. Prof. Tyagi has published more tha n 60 peer-reviewed publications and two patents. Prof Tyagi is a passionate teacher. He has invented a new student active teaching approach\, namely S tudent Presentation Based Effective Teaching (SPET). SPET is especially sui table for busy resaerch active and new faculty teaching technologically adv anced courses. He is also one of the pioneers who implemented emotional and positive intelligence training in engineering courses to develop life-long learning skills and mental resilience in challenging life circumstances. P rof. Tyagi has 24 years of experience in materials science arising from his BS and MS in metallurgical and materials engineering at the Indian Institu te of Technology(IIT Kanpur and IIT Roorkee). His diverse materials prowess developed from the experience of working with meter scale objects in a met allurgical alloy steel plant and molecular-scale nanomaterials in doctoral study at the University of Kentucky and postdoctoral research at Johns Hopk ins University.  \; \; \; \; \; \; \; \;&nb sp\; \; \; \; \; \; \; \; \; \; \;& nbsp\; \; \; \; \; \; \; \; \; \; \ ; \; \; \; \;
1. \; \; \; \; \ ; \; \; \; \; \; \; P. Tyagi\, C. Riso and E. Frieb e\, Organic Electronics \;64\, 188-194 (2019).
2. \; \; \; \; \; \; \; \;&nb sp\; \; \; P. Tyagi and C. Riso\, Nanotechnology \;30  \;(49)\, 495401 (2019).
3. \; \;&n bsp\; \; \; \; \; \; \; \; \; P. Tyagi and E. Friebe\, J. Mag. Mag. Mat. \;453\, 186-192 (201 8).
4. \; \; \; \; \; \; \;&nb sp\; \; \; \; P. Tyagi and C. Riso\, Organic Electronics \; 75\, 105421 (2019).
5. \; \;& nbsp\; \; \; \; \; \; \; \; \; P. Tyagi\, C . Baker and C. D'Angelo\, Nanotechnology \;26\, 30 5602 (2015).
6. \; \; \; \; \; \;& nbsp\; \; \; \; \; P. Tyagi\, H. Brown\, A. Grizzle\, C. D’ Angelo and B. R. Dahal\, Scientific Reports \;11&n bsp\;(1)\, 1-13 (2021).
 \;

 \; LAST-MODIFIED:20220228T183037Z LOCATION:https://lpscp.webex.com/lpscp/j.php?MTID=mc334dc03f4f334d9d8e1bcb4 b3a37a70 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Molecular Coupling Competing with Defects Within Insulator of the M agnetic Tunnel Junction-based Molecular Spintronics Devices TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220314T203000Z DTEND:20220314T213000Z DTSTAMP:20220808T214455Z UID:3proibl9lh2rguumn7biaif4a1@google.com CREATED:20220228T173301Z DESCRIPTION:Title: Shock Acceleration of Cosmic Ra ys in the Inhomogeneous Interstellar Medium

Speaker: \;Si yao Xu\, Institute for Advanced Study

Abstract: With the development of multi-messenger astronomy and the detection of astrophysical neutrinos\ , we are in a golden age of new cosmic ray (CR) measurements and studies. S upernova remnants are believed as the leading candidate for the source of G alactic CRs. Recent observations\, however\, challenge the well-developed t heory of shock acceleration of CRs in supernova remnants. I will reexamine the assumptions in the standard shock acceleration model and discuss the ke y missing physics for shocks propagating in the turbulent and inhomogeneous interstellar medium. A more realistic shock acceleration model holds the p romise to understand the observational puzzles and the origin of Galactic C Rs.

Notes: Join the meeting at 4:15 for meet and greet.  \;Visit  \;https://bit.ly/2PmJoT6&n bsp\;for access
LAST-MODIFIED:20220228T173516Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220303T203000Z DTEND:20220303T213000Z DTSTAMP:20220808T214455Z UID:12rppk7gefiblf99vo5gud6mnb@google.com CREATED:20220228T152329Z DESCRIPTION:Live at ESJ or via Zoom: UMIACS’ Rita Colwell on "Just Because You Are A Pawn You Don't Have To Lose The Game." \;https://go.umd.edu/colwell22 \; LAST-MODIFIED:20220228T152435Z LOCATION:Live at ESJ or via Zoom SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Dean’s Voices of Inclusive Excellence Lecture TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220309T170000Z DTEND:20220309T180000Z DTSTAMP:20220808T214455Z UID:48nott5s4bv2uq1dm1oic93ni3@google.com CREATED:20220207T164917Z DESCRIPTION:Speaker: Calvin M. Stewart\, Associate Professor\, Aerospace an d Mechanical Engineering University of Texas El Paso

Title: Material s at Extremes Research

Abstract: Materials are being asked to perfor m at “extremes” with increased inlet pressures and temperatures in industri al and aero gas turbines\, the rise of hypersonic flight\, and new Generati on IV fission and ITER Fusion reactor concepts. There is a need to develop advanced manufacturing techniques to fabricate extreme environment material s\, components\, and geometries not possible with conventional techniques. To meet this challenge\, government\, academia\, and industry has invested heavily in Additive Manufacturing (AM) technologies and Integrated Computat ional Materials Engineering (ICME) to achieve “designer” components with pr ocessing\, structure\, properties\, and performance designed to survive har sh environments. The quest for new materials requires that we quickly manuf acture\, qualify\, and model the performance of the candidate materials for service.


The Materials at Extremes Research Group (MERG) has focused on the development of advanced manufacturing\, testing and characterizatio n\, theoretical models\, and computational tools for various extreme enviro nment applications. In this seminar\, we will review the ongoing and future research projects at MERG\, and conduct a deep dive into accelerated\, par allelized\, and miniaturized testing methods for new materials qualificatio n and a probabilistic modeling framework for reliability-based design for e xtreme environments.

Bio:

Calvin M. Stewart is an associate pr ofessor in the Department of Mechanical Engineering at UTEP with a joint ap pointment in the Center for Space Exploration Technology Research (cSETR)\, a NASA University Research Center. He obtained a BS\, MS\, and PhD in Mech anical Engineering at the University of Central Florida in 2008\, 2009\, an d 2013 respectively. Dr. Stewart directs the Materials at Extremes Research Group (MERG) which focuses on the mechanical testing\, constitutive modeli ng\, and finite element analysis of materials subject to thermal\, mechanic al\, and chemical extremes. Within the gamut of extremes\; creep\, fatigue\ , thermomechanical fatigue\, corrosion\, oxidation\, impact\, and fracture are key focus areas. Dr. Stewart has authored over 40 articles in these are as. Current research involves the development of an accelerated creep test protocol for modern and advanced superalloys\, development of meta-constitu tive model capable of self-identifying the optimal functional form for a gi ven material and boundary conditions\, the development of unified viscoplas ticity constitutive models for elevated temperature applications\, and the fundamental thermomechanical characterization of electron beam melted (EBM) superalloys. Materials of interest include: cast and additively manufactur ed (AM) superalloys\, AM polymers\, biomaterials\, energetic materials\, tr ansportation materials\, and others. Computational interests include: stoch astic modeling and meta-heuristic optimization algorithms for material cons tant determination\, symbolic regression\, and shape optimization.

LAST-MODIFIED:20220228T151827Z LOCATION:2110 CHE (and via Zoom) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220309T160000Z DTEND:20220309T170000Z DTSTAMP:20220808T214455Z UID:0jsq0um7o684cf7s1ab10h8r2m@google.com CREATED:20220207T174447Z DESCRIPTION:Speaker: Meenal Jain\, UMCP

Title: Macromolecular Crowdi ng in Living Systems

Abstract: \;https://chem.umd.edu/events/macromolecular-crowding-living-systems LAST-MODIFIED:20220228T151259Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS/ANE/CHEMPHYS JOINT SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220304T180000Z DTEND:20220304T184500Z DTSTAMP:20220808T214455Z UID:07ojmpkmgafa6tdnef8ca5n8vu@google.com CREATED:20220225T140440Z DESCRIPTION:Title: Neural-Network Decoders for Measurement Induced Phase T ransitions\nFriday Quantum Seminar\nSpeaker: Hossein Dehghani (JQI)\nTime: Friday\, March 4\, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoo m: https://umd.zoom.us/j/96160177762\n\nMonitored random unitary circuits w ith intermittent measurements can host a phase transition between a pure an d a mixed phase with different entanglement entropy behaviors with the syst em size. Recently\, it was demonstrated that these phase transitions can be locally probed via entangling reference qubits to the quantum circuit and studying the purification dynamics of the reference qubits. After disentang ling from the circuit\, the state of the reference qubit can be determined according to the measurement outcomes of the qubits in the circuit. In this work\, we leverage modern machine learning tools to decode the state of th e reference qubits. In particular\, by considering circuits with given rand om operators and measurement locations\, we design a neural network decoder to efficiently determine the state of the reference qubit based on the mea surement records. Next\, after studying the complexity of our neural netwo rk decoders\, we demonstrate that entanglement entropy scaling phase transi tion can be translated into the learnability of the decoder function. Final ly\, we show that our learning procedure is transferable from smaller circu its to larger circuit with hundreds of qubits which proves the scalability of our method.\n\n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20220225T140440Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Hossein Dehghani TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220302T150000Z DTEND:20220302T161500Z DTSTAMP:20220808T214455Z UID:2mb23gdceeelssmia9gud7gvkm@google.com CREATED:20220225T135512Z DESCRIPTION:Title: Autonomous quantum error correction of a grid st ate qubit
Speaker: Jonathan Home (ETH Zürich)
Time: Wednesday\, Mar ch 2\, 2022 - 10:00am
Location: Virtual Via Zoom: https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 M eeting ID: 989 367 6372 Passcode: abc123

Quantum error correction is expected to play an important role in the realization of large-scale quant um computers. At the lowest level\, it takes advantage of embedding qubits in a larger Hilbert space\, giving redundancy which allows measurements whi ch preserve logical information while revealing the presence of errors. Whi le many codes rely on multiple physical systems\, Bosonic codes make use of the higher dimensional Hilbert space of a single harmonic oscillator mode. A powerful Bosonic code is the GKP code proposed in 2001\, which uses non- local "\;grid"\; states to protect information from small displacem ents of an oscillator. I will describe experiments in which we encode\, mea sure and perform quantum error correction on an encoded logical GKP qubit\, using the motion of a trapped ion coupled by laser light to an electronic ancilla qubit. We introduce a measurement approach for the finite-energy GK P code which can realize high fidelity qubit readout\, and use this to cons truct a dissipative map which performs error correction\, achieving an exte nsion of logical coherence across all logical axes of more than three. I wi ll also show how these techniques are related laser cooling\, offering a pa rticularly efficient means of entropy extraction from the oscillator via a single spin. I will present perspectives for exending this work to multiple logical qubits as well as towards break-even.

(Please note the earl ier start time of 10:00 a.m. for this seminar.)

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Meeting ID: 989 367 6372
Passcode : 578842 LAST-MODIFIED:20220225T135512Z LOCATION:https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3FCblk4aFdTMjkzTllvQ T09 Meeting ID: 989 367 6372 Passcode: abc123 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Jonathan Home TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220302T170000Z DTEND:20220302T180000Z DTSTAMP:20220808T214455Z UID:35g3cvgtsuluu7rf116r1hf4mp@google.com CREATED:20220207T164843Z DESCRIPTION:Speaker: David L. Green\, MSE &\; ChemE As sociate Professor\, University of Virginia

Title: Prediction and Vis ualization of Supramolecular Phase Separation on Metallic Nanoparticles

Abstract: \;The goal is to gain fundamental insights into the facto rs that dictate the synthesis of monolayer-protected nanoparticles and tran slate them into rational design strategies for novel functional soft materi als. He is interested in monolayer self-assembly\, polymer grafting\, and n anoparticle dispersion. He studies how to exert control over the interface of nanoparticles\, which dictates their degree of compatibility with and as sembly in soft materials\, provides reactive sites for attachment of molecu les\, such as drug payloads\, and tunes detectable properties\, such as the surface plasmon to a wavelength of interest. David Green is particularly i nterested in the development of nanoparticles coated with monolayers from m ixtures of organic molecules that may also self-assemble into advantageous patterns from supramolecular interactions. As pattern formation in self-ass embled monolayers is inextricably linked to their intermolecular interactio ns\, a key research challenge is the integration of experimental and theore tical techniques to enable \;de novo \;design of patterned nanoparticles. \; \;

Bio: Dr. Green is a professor of Mater ials Science\, Chemical and Mechanical Engineering at the University of Vir ginia. He received his \;B.S. from Boston University in 1991\, and his& nbsp\;M.S. (1997) and \;Ph.D. from the University of Maryland (2001).

Green's research group focuses on the synthesis of well-defined nanopartic les\, their dispersion into polymer solutions and melts\, and their suspens ion rheology.

First\, they study the mechanisms that produce well-def ined nanoparticles and then use this knowledge to optimize for a range of i ndustrially relevant properties such as particle stability\, surface expres sion\, or catalytic activity. They are also interested in developing timely methods for determining nanoparticle growth rates inside of emulsions whic h are used in formulating a variety of commercial products like fiber-optic coatings\, automotive finishes\, and chromatographic packings.

Secon d\, they examine how grafting uniform polymers to the interfaces of well-de fined nanoparticles affects their rheological behavior in polymer solutions and melts. With these fundamental studies\, they seek to optimize processi ng to achieve a desirable microstructure in industrial suspensions\, and to set a foundation for developing constitutive rheological models that predi ct the complex behavior of industrial suspensions. To this end\, they use r heological and rheo-optical measurements to elucidate how the interactions within model suspensions affect their flow at nano-\, micro-\, and macrosco pic length scales the full range of interactions that effect the processing of engineered materials.

LAST-MODIFIED:20220224T155940Z LOCATION:2110 CHE (and via Zoom) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220302T160000Z DTEND:20220302T170000Z DTSTAMP:20220808T214455Z UID:5a3e7bi5l3kidpc5ij887fn191@google.com CREATED:20220207T173944Z DESCRIPTION:Speaker: Dr. Michael Pittelkow\, University of Copen hagen

Title: Curved Aromatic Molecules and Anti-Aromatic Molecules
Abstract: \;https://chem.umd.edu/events/curved-a romatic-molecules-and-anti-aromatic-molecules
LAST-MODIFIED:20220224T153749Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220301T160000Z DTEND:20220301T170000Z DTSTAMP:20220808T214455Z UID:55qstg405e8ueemn6jf9mtjdr4@google.com CREATED:20220207T173737Z DESCRIPTION:Speaker: Dr. Rebecca Dutch\, University of Kentucky< br>
Title: Anchoring the Spring: The Role of Transmembrane Domain Intera ctions in Viral Fusion Protein Function

Abstract: \;Enveloped viruses utilize surface glycoproteins to bind and fuse wit h a target cell membrane. The zoonotic Hendra virus (HeV)\, a member of the Paramyxoviridae family\, utilizes the HeV attachment protein (G) and fusio n protein (F) to perform these critical functions. Upon triggering\, the tr imeric F protein undergoes a set of large\, irreversible conformation chang es to drive membrane fusion. We have shown that the transmembrane domain (T M) of the F protein\, separate from the rest of the protein\, is present in a monomer-trimer equilibrium\, and that specific sequences drive this asso ciation. Importantly\, we have demonstrated similar TM-TM interactions in t he TM regions from multiple viral fusion proteins. Our work with Hendra vir us F shown that this TM-TM association contributes to the stability of the pre-fusion form of the protein\, supporting a role for TM-TM interactions i n control of F protein conformational changes. To determine the impact of d isrupting TM-TM interactions\, constructs expressing the HeV F TM with limi ted flanking sequences were synthesized. Co-expression of these constructs with HeV F resulted in dramatically reductions in the stability of F protei n expression and ablation of fusion activity. In contrast\, no effects were observed when the HeV F TM constructs were co-expressed with the non-homol ogous parainfluenza virus 5 (PIV5) fusion protein\, indicating a requiremen t for specific interactions. To further examine this\, a TM peptide homolog ous to the PIV5 F TM domain was synthesized. Addition of the peptide prior to infection inhibited viral infection with PIV5\, but did not significantl y affect infection of human metapneumovirus\, a related virus. These findin gs indicate that TM-TM interactions are a critical stabilizer for the pre-f usion form of viral fusion proteins\, and suggest that disruption of these interactions inactivates F protein function\, likely by prematurely trigger ing F protein conformational changes. LAST-MODIFIED:20220224T153238Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry and Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220228T160000 DTEND;TZID=America/New_York:20220228T173000 DTSTAMP:20220808T214455Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220228T160000 CREATED:20220131T204640Z DESCRIPTION:
Title: Impact on transmon T1 \;due to electr ode layouts with different gaps \;

Abstract: The relaxation time& nbsp\;T1 \;of superconducting qubits has increased by orders of magnitude over the last two decades. I will describe the fabrication an d the measurement of the relaxation time in Al/AlOx/Al transmons that have gap-engineered electrodes. In one device\, the junction electrod e (thinner first layer) was formed by deposition of nominally pure aluminum and the counter-electrode was formed by deposition of oxygen-doped aluminu m. Repeated measurements showed \;T1 \;that varied from 100 to 300 μs at 20 mK. Another transmon\, which had the electrode formed b y deposition of oxygen-doped aluminum and the counter-electrode formed by d eposition of nominally pure aluminum\, also showed fluctuating \;T 1 \;values\, with a maximum \;T1 \; over 200 μs and an average that was also somewhat less than that of the fir st device. In an attempt to improve the removal of quasiparticles from the high gap side\, we also made 3-layer gap-engineered transmons\, with the th ird layer being a pure Al (which gives a low gap) top layer that was intend ed to act as a trap for quasiparticles. These devices showed \; \;r elatively large T1\, but not as large as our previous devices. W e will discuss \; \;possible explanations for this behavior. \;

This work was supported by the Maryland Quantum Materials Center\, t he Joint Quantum Institute\, and the Laboratory for Physical Sciences.

< u>
In-Person Location: Toll Physics Room # 1201
Time: 4pm -5:30pm


Zoom LInk:&nbs p\;https://umd.zoom.us/j/972 65681008 LAST-MODIFIED:20220223T210547Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Kungang Li TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220414T160000Z DTEND:20220414T170000Z DTSTAMP:20220808T214455Z UID:7s7au74elto7orgd2h40s1vbvb@google.com CREATED:20220223T204628Z DESCRIPTION:Speaker: Vincenzo Tamma\, University o f Portsmouth\, England

Title: \;Harnessing the ultimate quantum- enhanced sensitivity in distributed quantum sensing with squeezed light

Abstract: Distributed quantum sensing is an exciting emerging research field aimed at harnessing quantum resources to achieve quantum-enhanced sen sitivity in the estimation of single or multiple parameters\, including tem perature\, electromagnetic and gravitational fields\, \; distributed in a given quantum network. In particular\, squeezing is a well established r esource given its feasibility and robustness to decoherence with respect to entangled sources. However\, distributed quantum sensing schemes with sque ezed light often suffer from experimental challenges\, such as limitations on the range of values of the unknown parameter to be measured\, the struct ure of the optical network encoding it\, the need to iteratively adapt such a network and the presence of photonic losses.

We show that multi photon interference of squeezed photons with homodyne measurements can be u sed to achieve Heisenberg limited precision in the estimation of an unknown parameter of arbitrary value in an arbitrary linear network without the ne ed of iteratively adapted networks [1]. \; We demonstrate that such a t echnique can even \; be exploited in the estimation of a function of an arbitrary number of unknown distributed parameters\, whose functional expr ession can be tuned by using a simple auxiliary network [2].

F urthermore\, we demonstrate the robustness to losses in the Heisenberg limi ted estimation of a linear superposition of unknown phases by using a singl e squeezed vacuum source and an anti-squeezing operation at a single interf erometer output [3].

[1] G. Gramegna et al. New J. of Physics 23\, 053002(2021)\; G. Gramegna et al. Phys. Rev. Research 3\, 013152 (2021 )\; D. Triggiani\, P. Facchi\, and V. Tamma\, Eur. Phys. J. Plus 137:125 (2 022)

[2] D. Triggiani\, P. Facchi\, and V. Tamma\, Phys. Rev. A104\, 062603 (2021)

[3] D. Gatto\, P. Facchi and V.Tamma\, Phys. Rev. A&nbs p\;105\, 012607 (2022)\;D. Gatto\, P. Facchi and V. Tamma\, \;Phys. Rev . Research1\, 032024 (2019)

Host: Dr. William D. Phillips

< u>
LAST-MODIFIED:20220223T205400Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220301T181500Z DTEND:20220301T191500Z DTSTAMP:20220808T214455Z UID:3g0175j6f10uifukm71n1sahbv@google.com CREATED:20220207T154307Z DESCRIPTION: LAST-MODIFIED:20220222T142750Z LOCATION:IPST Building #085\, Room 1116 SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220228T200000Z DTEND:20220228T213000Z DTSTAMP:20220808T214455Z UID:6eji7jkcd51fgfq3lpvloghjgj@google.com CREATED:20220118T144322Z DESCRIPTION:Seminar will be conducted via zoom.

Sp eaker: Keisuke Harigaya\, CERN

Title : Parity symmetry breaking scal e and Standard Model parameters


< br>Abstract : The strong CP problem can be solved by parity symm etry. We first review two classes of models: the ones with the minimal ferm ion content and the ones with the minimal Higgs content. We then focus on t he latter class of models and show that the parity symmetry breaking scale is predicted to be the energy scale at which the standard model Higgs quart ic coupling vanishes. Surprisingly\, after fixing the parity symmetry break ing scale in this way\, the gauge coupling constants unify at a high energy scale. We also discuss a model with a dark matter candidate and show that the dark matter direct detection rate is predicted as a function of the sta ndard model parameters.

For zoom link please email mknouse@umd.edu
LAST-MODIFIED:20220221T154434Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220303T160000Z DTEND:20220303T170000Z DTSTAMP:20220808T214455Z UID:1h9kfbsjcr10c7b7112a9m8or6@google.com CREATED:20220207T174258Z DESCRIPTION:Speaker: Dr. Michael Pittelkow\, University of Copen hagen

Title: Curved Aromatic Molecules and Anti-Aromatic Molecules
Abstract: \;https://chem.umd.edu/events/curved-a romatic-molecules-and-anti-aromatic-molecules
LAST-MODIFIED:20220221T153555Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220221T150000 DTEND;TZID=America/New_York:20220221T163000 DTSTAMP:20220808T214455Z UID:3jcjhdprkfbma5ekjv7mj8374k@google.com RECURRENCE-ID;TZID=America/New_York:20220221T150000 CREATED:20220208T193739Z DESCRIPTION:**Seminar will be conducted via zoom**

Speaker: Selim Hotinli\, JHU

Title: Fundamental physics from veloci ty reconstruction with the cosmic microwave background and galaxy surveys


Abstract: Next generation cosmic microwave background (CMB) experiments and galaxy surveys will generate a w ealth of new data with unprecedented precision on small scales. Correlation s between CMB anisotropies and the galaxy density carry valuable cosmologic al information about the largest scales\, creating novel opportunities for inference. It is possible to foresee a cosmological paradigm shift\, in whi ch reconstruction of the gravitational weak-lensing potential\, velocity fi elds and the remote quadropole field will provide the most precise tests of fundamental physics. The use of the second-order effects in the CMB to ext ract this information motivate a strong push towards low noise\, high resol ution frontiers of the upcoming CMB experiments. In this talk I will discus s the prospects to use small-scale kinetic Sunyaev Zel’dovich (kSZ) effect measured by the upcoming CMB experiments\, in cross-correlation with ongoin g galaxy surveys\, to extract cosmological information. I will share the re cent developments on velocity-reconstruction tomography from kSZ and other effects on the CMB.

For zoom link please email: mknouse@umd.edu
LAST-MODIFIED:20220221T133412Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220228T213000Z DTEND:20220228T223000Z DTSTAMP:20220808T214455Z UID:0mgh04275vtl7om8sem0dsl2t5@google.com CREATED:20220211T163732Z DESCRIPTION:Title: Particle Acceleration in Magnetic Reco nnection

Speaker: Haihong Che\, University of Alabama in Huntsville< br>
Abstract: \;How magnetic reconnection efficiently produces a hug e number of mildly relativistic energetic particles is an outstanding probl em in solar physics and heliophysics. In particular\, three major problems in solar particle acceleration have to be addressed: 1) the development of power-law energy spectra for both electrons and ions\; 2) the "big number p roblem" of electrons. Recent observations discovered that the time to accel erate electrons to a power-law energy distribution in solar flares can be s horter than 50 ms while nearly the total number of electrons in the current sheet is accelerated in 1000s. 3) Observations suggest that the accelerati on process of ions is related to the electrons'. In this talk\, I will pres ent a novel acceleration mechanism in magnetic reconnection. I will show ho w the velocity shear stored naturally in force-free currents of solar flare s can drive an electron Kelvin-Helmholtz instability (EKHI) during magnetic reconnection. The EKHI efficiently accelerates electrons to a power-law en ergy spectrum with an index comparable to the observations in a few tens of ion gyro-periods (~ 0.1 ms for solar corona plasma). With the proceeding o f reconnection\, the EKHI induced Alfvenic turbulence can accelerate ions t o broken power-law energy spectra.

Notes: Join the meeting at 4:15 f or meet and greet.  \;Visit https://bi t.ly/2PmJoT6 \;for access
LAST-MODIFIED:20220219T004807Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220221T173000Z DTEND:20220221T190000Z DTSTAMP:20220808T214455Z UID:4ar125k5p6eqsimt15a18s5va4@google.com CREATED:20220218T174901Z DESCRIPTION:Speaker: Ivan Horvath\, Inst. of Nuclear Physics\, C zech Academy of Sciences &\; Univ. of Kentucky

Title: Effecti ve Dimensions of Dirac Modes in IR Phase of QCD

Abstract:
One con sequence of the recently developed effective number theory\, designed to co unt objects with
probabilities\, is that it leads to a well-defined con cept of effective dimension. Due to the additivity
of effective numbers \, the latter is a measure-based construct extending the Hausdorff/Minkowsk i-like
notion of dimension for fixed sets to the stochastic domain. Bot h IR and UV properties can be
characterized in this way. In this talk I will discuss the recent calculation of IR effective dimension
of Dirac modes in the IR phase of thermal QCD. Our results support the existence of a non-trivial
structure in deep IR of the spectrum\, involving low inte ger dimensions. It also implies an unexpected
non-analyticity structure of Dirac spectrum characteristic to IR phase and associated with Anderson-l ike
localization properties of IR. The resulting picture is consistent a nd enhances our recent proposal
that IR phase involves scale invariance in the infrared.
LAST-MODIFIED:20220218T174901Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220222T160000 DTEND;TZID=America/New_York:20220222T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu_R20220215T210000@google.com RECURRENCE-ID;TZID=America/New_York:20220222T160000 CREATED:20200116T204737Z DESCRIPTION:Monika Schleier-Smith\, Stanford University
 \;
< html-blob>Atoms and Photons: Quantum Technology meets Fundamental Physic s

The power of quantum information lies in its capacity to be no n-local\, encoded in correlations among entangled particles. \; Yet our ability to produce\, understand\, and exploit such correlations is hampere d by the fact that the interactions between particles are ordinarily local.  \; To circumvent this limitation in the laboratory\, we let distant at oms “talk” to each other with the aid of photons that act as messengers.&nb sp\; By tailoring the frequency spectrum of an optical control field\, we p rogram the spin-spin couplings in an array of atomic ensembles\, thereby ac cessing frustrated interaction graphs and exotic geometries and topologies. Such advances in optical control of interactions open new opportunities in areas ranging from quantum technologies to fundamental physics. \; I w ill touch on implications for quantum optimization algorithms\, quantum-enh anced sensing\, and simulating quantum gravity.
 \;
Host: Alicia Kollár \;
LAST-MODIFIED:20220218T151016Z LOCATION:1412 John S. Toll Physics Building\, 4150 Campus Dr\, College Park \, MD 20740\, USA SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220308T190000Z DTEND:20220308T200000Z DTSTAMP:20220808T214455Z UID:3mqamqtdss6p3n79je7jt36ui1@google.com CREATED:20220217T211814Z DESCRIPTION:
Speaker: Anil Zenginoglu\, IPST\, UMD

Title: Hyperbolic geometry for black-hole perturbations

Abstract : Hyperbolic geometry plays a central role in the foundations of relativity and the celebrated AdS/CFT correspondence. This talk will demonstrate how hyperbolic geometry arises from a globally regular decomposition of spaceti me into space and time. Such regular coordinates have beneficial properties for studies of wave equations and black-hole perturbations. I will present two recent examples: the frequency-domain calculation of self-force and th e time-domain calculation of cosmological perturbations. To conclude\, I wi ll share speculations on applications of such coordinates to non-relativist ic problems and quantum fields.

Seminar will also be streamed live v ia zoom: https://umd.zoom.us/j/ 96792631394
LAST-MODIFIED:20220217T211814Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220224T173000Z DTEND:20220224T190000Z DTSTAMP:20220808T214455Z UID:2otnosu6gvqon44tcdav05qskh@google.com CREATED:20220209T172551Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/94067038750

Sp eaker: Ulf Meissner\, U Bonn

Title: Recent Developments on Nuclear L attice EFT



Abs tract: Nuclear Lattice Effective Field Theory (NLEFT) is a fairly new appro ach to tackle nuclear
few- and many-body problems . After a short introduction\, I will discuss recent results\, such as
the hidden spin-isospin exchange symmetry\, the Wigne r SU(4) symmetry and the emergence
of duality in the spectrum of 12C\, the first steps towards heavy nuclei and ab initio nu clear
thermodynamics. I end with an outlook conce rning what can be expected from NLEFT in the years to come. LAST-MODIFIED:20220217T182223Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220307T210000Z DTEND:20220307T220000Z DTSTAMP:20220808T214455Z UID:0de8n552e3sokn05p6ocuqetf7@google.com CREATED:20220127T162834Z DESCRIPTION:

Title: Protein Surfactant s: Putting “Membranes” on Membrane-less Organelles

Speaker: \;Benjamin Schuster\, Rutgers University

H osted by: \;Gregg Duncan

Abstract: \;

M embrane-less organelles\, also called biomolecular condensates\, are assemb lies of highly concentrated biomolecules that condense through liquid–liqui d phase separation. One major question in the field is how proteins assembl e into multilayered condensates. A second outstanding question is how the s ize of biomolecular condensates is controlled. Developing biophysical insig ht into these questions is important for understanding the function and reg ulation of multiphasic organelles\, such as P granules and nucleoli. Recent ly\, we generated amphiphilic proteins that localize to the surface of cond ensates. We observed diverse assemblies\, including condensates enveloped b y surfactant-like films\, as well as complex multiphasic morphologies. In s ome configurations\, these surfactant-like proteins influence condensate si ze. Our results suggest an important role of protein amphiphiles in establi shing membrane-less organelle structure and function.

Zoom Lin k:

https://umd.zoom.us/j/97881020532?pwd= L1ArV203ZlBmU1daMUtwd3VzUlppUT09
Meeting ID: 978 8102 0532
Passcode: 504141


LAST-MODIFIED:20220217T171021Z LOCATION:VIRTUAL SEMINAR SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220221T160000 DTEND;TZID=America/New_York:20220221T173000 DTSTAMP:20220808T214455Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220221T160000 CREATED:20220131T204640Z DESCRIPTION:
Title: \;Ultrafast optical control of phonon frequencie s in Fe3GeTe2

Abstract: \; \;Optical manipulation of coherent phonon frequency in two-dimensional (2D) materials could advance t he development of ultrafast phononics in atomic-thin platforms. Phonon freq uency modulation has been achieved through doping\, strain\, structural or thermal engineering. However\, these approaches are either slow\, irreversi ble\, or damaging to the crystal structure of the material. Here\, we repor t the experimental observation of strong laser-polarization control of cohe rent phonon frequency through time-resolved pump-probe spectroscopic study of van der Waals (vdW) materials Fe3GeTe2. When the polarization of the pum ping laser with tilted incidence is swept between in-plane and out-of-plane orientations\, the frequencies of excited phonons can be monotonically tun ed by as large as 3% (~100 GHz). Our first-principles calculations suggest the strong planar and vertical inter-atomic interaction asymmetry in layere d materials accounts for the observed polarization-dependent phonon frequen cies\, as in-plane/out-of-plane polarization modifies the restoring force o f the lattice vibration differently. Our work provides an insightful unders tanding of the coherent phonon dynamics in layered vdW materials and opens new paths to optically manipulating coherent phonons.



In-Person Location: Toll Physics Room # 1201Time: 4pm -5:30pm


Zoom LInk : \;https://umd.zoom.us/j/9 7265681008 LAST-MODIFIED:20220217T170613Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Viviane Zurdo Costa TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220224T160000Z DTEND:20220224T170000Z DTSTAMP:20220808T214455Z UID:4hcm5kgbrskba6ejc0ta67u2hn@google.com CREATED:20220207T173454Z DESCRIPTION:Speaker: Dr. Lyle Isaacs\, UMCP

Title: Cucurbit [n] uril Molecular Containers: From Basic Science to Biomedical A pplications

Abstract: \;https://chem.umd.edu/events/cucurbitnuril-molecular-containers-basic-sci ence-biomedical-applications
LAST-MODIFIED:20220217T150541Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220223T170000Z DTEND:20220223T180000Z DTSTAMP:20220808T214455Z UID:4pqtqfmtbuug1397innhrkd0ar@google.com CREATED:20220207T164800Z DESCRIPTION:Speaker: Joseph A. King\, Jr.\, Ph.D.\, Program Director\, ARPA -E\, U.S. Department of Energy\n\nTitle: An Unexpected Journey Through Scie nce & Engineering\n\nAbstract: A presentation on how one’s early anticipate d career path deviates in reality due to the choices one makes in the momen t. In this tale\, the meanderings include the design\, scale-up and optimiz ation of commercial plants\, acquisitions in post-iron curtain Europe\, fiv e years on Wall Street\, developing cements in China and India\, more VC ac tivities\, and expanding new technologies while in the federal government. Detailed technology descriptions will span the development of solventless\, non-phosgene routes to polymers\, a ten-year publishing battle over kineti cs\, getting around the mass law (acoustics)\, making a figure of merit mat erial independent (thermoelectric generators)\, more cement\, and approache s to squashing the “Duck Curve” (Grid).\nBio:\n\nJoseph A. King Jr. is curr ently a Program Director in the Department of Energy’s Advance Research Pro jects Agency for Energy (ARPA-E) with current activities in waste heat\, ce ments and concretes\, amorphous metals and grid optimization. Dr. King come s to ARPA-E from DuPont where he was a Managing Director in DuPont’s Corpor ate Venture Capital group responsible for their advanced materials investme nts. Prior to DuPont\, Dr. King held a variety of positions GE ranging from Liaison scientist\, to Vice President of Risk Management and Capital Marke ts. He is a double alum from U.C. Berkeley with a Ph.D. in Physical Organic Chemistry. After graduation\, Dr. King conducted a post-doctoral study at the Max Planck Insitut für Kohlenforschung in Germany. He is the author of over 40 journal articles and more than 100 patents. LAST-MODIFIED:20220217T143913Z LOCATION:2110 CHE (and via Zoom) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220222T180000Z DTEND:20220222T191500Z DTSTAMP:20220808T214455Z UID:2137ip4b3fmc6bhghk6ivjqgpr@google.com CREATED:20220207T154018Z DESCRIPTION:Speaker: Dr. Christopher Moakler\, UMD\n\nTitle: the Hydra Stri ng Method ad its Application to High Dimensional Potential Energy Surfaces Arising from Granular Systems\n\nAbstract: Granular materials are a ubiquit ous yet ill-understood class of media. Different approaches and techniques have been developed to understand the many complex behaviors they exhibit\, but none have been completely successful. I have instituted a novel means to understand granular materials. This novel method\, the Hydra String Meth od (HSM)\, is an efficient and autonomous way to trawl the potential energy surfaces (PESs) to enumerate the saddles\, minima\, and connections betwee n them. I have applied the Hydra String Method to bi-disperse configuration s of soft spheres to map out ensembles of pathways between stable packings of the system. These transition pathways are a low-dimensional projection o f the larger PES. By understanding these pathways and how they connect to o ne another may allow for the prediction of the dynamics of a granular syste m as it moves between stable packings. LAST-MODIFIED:20220217T141433Z LOCATION:https://go.umd.edu/statphys_zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220224T190000Z DTEND:20220224T203000Z DTSTAMP:20220808T214455Z UID:61pdbgrmr3uat1su4s5fgk6q0d@google.com CREATED:20220214T143303Z DESCRIPTION:Title: \;Electron pairs without superconductivity in a diso rdered superconductor

Abstract: The idea that preformed electron pai rs could exist in a superconductor above its zero-resistance state has been explored for unconventional\, interface\, and disordered superconductors\, yet direct experimental evidence is lacking. In this talk\, I will introdu ce new instrumentation that can unambiguously detect and quantify the numbe r of electron pairs in a sample: the \;electron pair microscope& nbsp\;[1-3]. Applying it to the disordered superconductor titanium nitride\ , we show that the majority of electrons is paired up to temperatures much higher than the zero-resistance critical temperature \;Tc\, by o bserving a clear enhancement in the shot noise that is equivalent to a chan ge of the effective charge from 1 to 2 electron charges [4]. We further sho w that spectroscopic gap fills up rather than closes when increasing temper ature. Our results thus demonstrate the existence of a novel state above&nb sp\;Tc \;that\, much like an ordinary metal\, has no (pseudo)gap \, but carries charge entirely via paired electrons.

Host: Paglione< br> \;
Seminar on Zoom
Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848 LAST-MODIFIED:20220215T200655Z LOCATION:ZOOM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM (ZOOM): Milan Allan\, Leiden University TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220301T160000 DTEND;TZID=America/New_York:20220301T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu_R20220215T210000@google.com RECURRENCE-ID;TZID=America/New_York:20220301T160000 CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220215T180724Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:No Physics colloquium today TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220225T180000Z DTEND:20220225T184500Z DTSTAMP:20220808T214455Z UID:5ejomkcvknenjcfronujebn1oo@google.com CREATED:20220215T173047Z DESCRIPTION:Title: Using a trapped ion quantum computer to simulate NMR sp ectra\nSpeaker: Debopriyo Biswas (Duke University)\nTime: Friday\, Februa ry 25\, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://um d.zoom.us/j/96160177762\n\nNuclear magnetic resonance (NMR) spectroscopy is a useful tool in understanding molecular composition and dynamics\, but si mulating NMR spectra of large molecules becomes intractable on classical co mputers as the spin correlations in these systems can grow exponentially wi th molecule size. In contrast\, quantum computers are well suited to simula te NMR spectra of molecules\, particularly zero- to ultralow field (ZULF) N MR where the spin-spin interactions in the molecules dominate. In this work \, we demonstrate the first quantum simulation of an NMR spectrum\, specifi cally that of the methyl group of acetonitrile in ZULF\, using a trapped io n quantum computer. The simulation involves state-of-the-art “QFAST” circui t synthesis algorithm that produces short circuits\, with the circuit sampl ing rate considerably reduced by employing a compressed sensing technique. This work lays the foundation for simulation of NMR experiments on near-ter m quantum hardware.\n\n(Pizza and refreshments will be served after the tal k.) LAST-MODIFIED:20220215T173047Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Debopriyo Biswas TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220228T160000Z DTEND:20220228T170000Z DTSTAMP:20220808T214455Z UID:6rh9161c7ae4julppkaoedhmj1@google.com CREATED:20220121T183431Z DESCRIPTION:Speaker: Alexander Efros\, Naval Research Laboratory

Title: \;Excitons in Perovskite Nanostructures

Abstract: The bright emission observed incesium lead halide perovskite nanocrystals (NCs) has recently been explained interms of a bright exciton ground state\ , a claim that would make these materialsthe first known examples in which t he exciton ground state is not an opticallyforbidden dark exciton. This unp recedented claim has been the subject ofintense experimental investigation that has so far failed to detect the darkground-state exciton in CsPbBr3 NCs. \; \;I will discuss the exciton finestructure created by the crystal field and the short-range and long-rangeelectron−hole exchan ge interaction and will \;show that the only  \;Rashba termsprovide an explanation for the observed bright exciton level order in CsPbBr3 NCs. The size dependence of the exciton fine structure calculated for perovskiteNCs shows that the bright−dark level inversion caused by the Rash ba effect issuppressed by the enhanced electron−hole exchange interaction in small NCs. [1]

Another interestingphenomenon connected with presence of the Rashba spin-orbit terms is creationof helical exciton states in orthorh ombic perovskites\, which are split fromeach other. The splitting can be de scribed as a Zeeman effect in an effectivemagnetic field\, whose direction and magnitude depend on the exciton momentum.The selective excitation of th ese states by helical light gives rise to CD.Using experimentally determine d material parameters\, we calculate significantcircular dichroism of order 30% in orthorhombic perovskites under off-normal\,top illumination. These calculations suggest the effect is observable and CD canbe measured in non- chiral perovskite nanostructures such as layered-2D perovskitesor nanoplate lets. [2] \;

Large spin-orbit Rashba terms inthe conduction and valence bands leads to the exciton with complex dispersion –Rashba exciton. The Rashba terms  \;in casewhen they have different signs flip the ord er of the bright and dark excitonsat zero exciton momentum. \; They als oaffect the exciton dispersion at momentum not equal to zero and creates th eexciton dispersion minima at momentum not equal to zero. [3] . \; Calc ulations show that the ground excitonstate at k=0 is optically active.  \;However\, the exciton dispersion minima occur at  \;nonzero momentum.  \;

Finally\, I will discuss thethickness-dependent fine structu re of excitons in perovskite nanoplatelets. Ourtheoretical model introduces the effect of the strong special confinement onthe band-edge Bloch functio ns. The predicted fine structure is very differentfrom that observed in 3D nanocrystals\, and is in good agreement with experimentalobservation. [4]

[1]  \; \;M. A. Becker\, et al. “Bright triplet exciton s incaesium lead halide perovskites\,” Nature\,553\, 189-193 (2018)

[2] P. C. Sercel\, Z. V. Vardeny\, Al. L. Efros\, “Circular di chroismin non-chiral metal halide perovskites” Nanoscale 2020\, DOI/10.1039 /D0NR05232A

[3]M. W. Swift\, J. L. Lyons\, Al. L.  \;Efros\, P. C . Sercel “Rashba exciton in a 2D perovskite quantum dot” \; Nanoscale 2 021\, doi.org/10.1039/D1NR04884H

[4] M. \;Gramlich\, M. W. Swift\ , C. Lampe\, J. L. Lyons\, M. Döblinger\, Al. L.Efros\, P. C. Sercel\, and A. S. Urban\, “Dark \; and \;Bright \; Excitons \; in \ ;Halide \; Perovskite Nanoplatelets” Adv.Sci. 2021\, 2103013\, DOI:10.1 002/advs.202103013. \; \;


Host: Kartik Srinivasan
LAST-MODIFIED:20220215T160832Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220502T150000Z DTEND:20220502T160000Z DTSTAMP:20220808T214455Z UID:6qdj2tjkmjd7lc34p6ecfmr3nv@google.com CREATED:20220121T183554Z DESCRIPTION:Speaker: Ana Asenjo-Garcia\, Columbia University

Title: \;Universality of Dicke superradiance in atomic arrays
Abstract: \;Tightly packed ordered arrays of atoms exhibit remarkable collective optical properties\, as dissipation in the form of photon emiss ion is correlated. In this talk\, I will discuss the many-body out-of-equil ibrium physics of atomic arrays\, and focus on the problem of Dicke superra diance\, where a collection of excited atoms synchronizes as they decay\, e mitting a short and intense pulse of light. Superradiance remains an open p roblem in extended systems due to the exponential growth of complexity with atom number. I will show that superradiance is a universal phenomenon in o rdered arrays\, and generically occurs if the inter-atomic distance is smal l enough. Our predictions can be tested in state of the art experiments wit h arrays of neutral atoms\, molecules\, and solid-state emitters and pave t he way towards understanding the role of many-body decay in quantum simulat ion\, metrology\, and lasing.

Host: Alicia Kollar
LAST-MODIFIED:20220215T143535Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220218T180000Z DTEND:20220218T184500Z DTSTAMP:20220808T214455Z UID:6vaf3ln9tt7e9he3ma54hj38v5@google.com CREATED:20220211T225950Z DESCRIPTION:Title: Clustering of steady-state correlations in open systems with long-range interactions\nSpeaker: Andrew Guo (QuICS)\nTime: Friday\ , February 18\, 2022 - 1:00pm\nLocation: ATL 2324 and Virtual Via Zoom: ht tps://umd.zoom.us/j/96160177762\n\nLieb-Robinson bounds are powerful analyt ical tools for constraining the dynamic and static properties of non-relati vistic quantum systems. Recently\, a complete picture for closed systems th at evolve unitarily in time has been achieved. In experimental systems\, ho wever\, interactions with the environment cannot generally be ignored\, and the extension of Lieb-Robinson bounds to dissipative systems which evolve non-unitarily in time remains an open challenge. In this work\, we prove tw o Lieb-Robinson bounds that constrain the dynamics of open quantum systems with long-range interactions that decay as a power-law in the distance betw een particles. Using a combination of these Lieb-Robinson bounds and mixing bounds which arise from "reversibility''—naturally satisfied for thermal e nvironments---we prove the clustering of correlations in the steady states of open quantum systems with long-range interactions. Our work provides an initial step towards constraining the steady-state entanglement structure f or a broad class of experimental platforms\, and we highlight several open directions regarding the application of Lieb-Robinson bounds to dissipative systems.\n\n(Pizza and refreshments will be served after the talk.) LAST-MODIFIED:20220211T225950Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Andrew Guo TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220307T160000 DTEND;TZID=America/New_York:20220307T173000 DTSTAMP:20220808T214455Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220307T160000 CREATED:20220131T204640Z DESCRIPTION: LAST-MODIFIED:20220211T215432Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220216T140000Z DTEND:20220216T151500Z DTSTAMP:20220808T214455Z UID:14da3mqgnp2kqm9mhv1lk46qp5@google.com CREATED:20220211T212843Z DESCRIPTION:Title: Photonic quantum computational advantage\nSpeaker: Chao -Yang Lu (USTC\, Hefei)\nTime: Wednesday\, February 16\, 2022 - 9:00am\nLoc ation: Virtual Via Zoom: https://umd.zoom.us/j/99289699443 Meeting ID: 992 8969 9443\n\nThe main challenge for scaling up photonic quantum technologie s is the lack of perfect quantum light sources. We have pushed the parametr ic down-conversion to its physical limit and produce two-photon source with simultaneously a collection efficiency of 97% and an indistinguishability of 96% between independent photons. Using a single quantum dot in microcavi ties\, we have produced on-demand single photons with high purity (>99%)\, near-unity indistinguishability\, and high extraction efficiency—all combin ed in a single device compatibly and simultaneously. Based on the high-perf ormance quantum light sources\, we have implemented boson sampling—which is an intermediate model of quantum computing\, a strong candidate for demons trating quantum computational advantage and refuting Extended Church Turing Thesis—with up to 113 photon clicks after a 144-mode interferometer. The p hotonic quantum computer\, Jiuzhang\, yields an output state space dimensio n of 10^43 and a sampling rate that is 10^24 faster using the state-of-the- art simulation strategy on supercomputers.\n\n(Please note the earlier star t time of 9:00 a.m. for this seminar.) LAST-MODIFIED:20220211T212843Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/99289699443 Meeting ID: 99 2 8969 9443 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Chao-Yang Lu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220217T173000Z DTEND:20220217T190000Z DTSTAMP:20220808T214455Z UID:07vjit33b9r6pa6ff857dcdkhj@google.com CREATED:20220209T170735Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/94067038750

Speaker: Wouter Dekens\, UCSD

Title: \;
< br>Neutrinoless double beta decay in effective field theory


Abstract: \;
Neutrinoless double beta decay (NLDBD) is the most sen sitive probe of lepton-number violation. Its discovery would be a clear sig nal of physics beyond the Standard Model\, confirm the Majorana nature of n eutrinos\, and provide insight into scenarios of baryogenesis through lepto genesis. Whenever lepton-number violation arises at a scale well above the electroweak scale\, it can be described by effective interactions in an eff ective-field theory framework. In this talk\, I will outline the necessary steps to assess the impact on NLDBD half lives\, paying special attention t o the matching of the effective interactions onto Chiral Effective Theory a t low energies. Finally\, I will illustrate how this framework can be exten ded to include the effects of light sterile neutrinos and discuss the resul ting constraints on the lepton-number violating interactions. LAST-MODIFIED:20220211T211406Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220223T203000Z DTEND:20220223T213000Z DTSTAMP:20220808T214455Z UID:6si66kbtj3qpg8g77ogng4dca9@google.com CREATED:20220211T181231Z DESCRIPTION:Title : Relativistic Magnetic Reconnection in 3D\n\nSpeaker Nam e: Greg Werner\nSpeaker Institution : University of Colorado\n\nAbstract : Magnetic reconnection is a fundamental plasma process that takes place in t hin current sheets and rapidly converts magnetic energy into particle kinet ic energy. It may be the primary mechanism behind spectacular outbursts of radiation in the universe\, from solar flares in our Sun to high energy TeV flares in distant blazars. Magnetic reconnection has been extensively stud ied in 2D\; a particularly important feature of reconnection in 2D is the f ormation of an intricate hierarchy of plasmoids\, which have important cons equences for reconnection dynamics. But how does reconnection proceed in na ture\, in 3D? E.g.\, does a similar plasmoid chain develop? I will discuss the evolution of thin current sheets in relativistic collisionless electron -positron plasma\; although 2D-like reconnection can take place in 3D\, oth er nonlinear instabilities compete with it. In particular\, the relativisti c drift-kink instability can release magnetic energy as fast as reconnectio n can\, and also yields similar nonthermal particle acceleration.\n\nHost N ame: Marc Swisdak\nHost E-Mail: swisdak@Umd.edu LAST-MODIFIED:20220211T181232Z LOCATION:Contact: Marc Swisdak - swisdak@umd.edu for the talk's Zoom addres s SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220307T213000Z DTEND:20220307T223000Z DTSTAMP:20220808T214455Z UID:2pphde8djnl2ehtdc164cbtkkv@google.com CREATED:20220211T164357Z DESCRIPTION:Title: A Low-cost Radio Telescope Array for Ionospheric Remote Sensing

Speaker: Joseph Helmboldt\, Remote Sensing Division\, Naval Research Laboratory

Abstract: The Deployable Low-band Ionosphere and Transient Experiment (DLITE) is a fo ur-element interferometric radio telescope made from mostly commercial off- the-shelf parts to minimize costs and maximize ease of deployment. It opera tes in the High Frequency (HF) and Very High Frequency (VHF) regimes\, nomi nally in a 30--40 MHz band\, but with good sensitivity (sky-noise dominated ) in the 20-80 MHz range. Its configuration is optimized to probe ionospher ic structure using the so-called "A-Team\," exceptionally bright sources of cosmic radio emission. Methods have been developed to track the apparent p ositions and intensities of A-Team sources without the need for beam formin g to enable measurements of VHF scintillations as well as total electron co ntent (TEC) gradients. Time difference of arrival (TDOA) and frequency diff erence of arrival (FDOA) methods have been adapted for all-sky imaging to f acilitate both statistical measurements of scintillation levels and time do main astronomy. This presentation will describe the system design\, analysi s algorithms\, and science that can be conducted using results from prototy pe DLITE systems in Maryland\, New Mexico\, and Florida.

Notes: Join the meeting at 4:15 for meet and greet.  \;Visit https://bit.ly/2PmJoT6 \; for access LAST-MODIFIED:20220211T164357Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220510T220000Z DTEND:20220511T005000Z DTSTAMP:20220808T214455Z UID:4ddt8pr3kdoipps1dlinetsk0a@google.com CREATED:20220210T150401Z DESCRIPTION:Jim Gates presents the film The Day the E arth Stood Stillas part of the Science and Society via Film course. All are welcome. For information and the entire semester's schedule\, see the course website: https://www.physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T150401Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: The Day the Earth Stood Still TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220503T220000Z DTEND:20220504T005000Z DTSTAMP:20220808T214455Z UID:3bpb9bir9cvu0gm84j3065felo@google.com CREATED:20220210T150304Z DESCRIPTION:Tom Cohen presents the film Missiles of October as part of the Science and Society via Film course. All are wel come. For information and the entire semester's schedule\, see the course w ebsite: htt ps://www.physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T150304Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Missiles of October TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220419T220000Z DTEND:20220420T005000Z DTSTAMP:20220808T214455Z UID:27v66q0eigfobpkdm9fqpe4c2v@google.com CREATED:20220210T150023Z DESCRIPTION:Jonathan Simon presents the filmEternal Sunshin e of the Spotless Mind as part of the Science and Society via Film co urse. All are welcome. For information and the entire semester's schedule\, see the course website: https://www.physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T150023Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Eternal Sunshine of the Spotless Mind TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220412T220000Z DTEND:20220413T005000Z DTSTAMP:20220808T214455Z UID:43dp2nqhdndhh9npsq4ulrqf2d@google.com CREATED:20220210T145852Z DESCRIPTION:Susan Eisenhower presents the film 1984 as part of the Science and Society via Film course. All are welcome. Fo r information and the entire semester's schedule\, see the course website: https://www .physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145925Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: 1984 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220405T220000Z DTEND:20220406T005000Z DTSTAMP:20220808T214455Z UID:6005k5mkpsuc7tl7i6ovurut3f@google.com CREATED:20220210T145746Z DESCRIPTION:Bill Dorland presents the film Failsafe as part of the Science and Society via Film course. All are welcome. For infor mation and the entire semester's schedule\, see the course website: https://www.physic s.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145746Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Failsafe TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T220000Z DTEND:20220330T005000Z DTSTAMP:20220808T214455Z UID:5rc784rf62l1oencidh5i0nmlf@google.com CREATED:20220210T145705Z DESCRIPTION:Dianna Abney presents the film Co ntagion as part of the Science and Society via Film course. All are wel come. For information and the entire semester's schedule\, see the course w ebsite: htt ps://www.physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145705Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Contagion TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220222T230000Z DTEND:20220223T015000Z DTSTAMP:20220808T214455Z UID:3pbi8r75esi0182ftjl693fl03@google.com CREATED:20220210T145548Z DESCRIPTION:Jordan Goodman presents the film Apollo 13 as part of the Science and Society via Film course. All are welcome. For in formation and the entire semester's schedule\, see the course website: https://www.phy sics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145548Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Apollo 13 TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220315T220000Z DTEND:20220316T005000Z DTSTAMP:20220808T214455Z UID:4ble4fu6acgu9u3nlp7l2tcmqa@google.com CREATED:20220210T144107Z DESCRIPTION:Jeff Starr presents the film Zero Days < /i>as part of the Science and Society via Film course. All are welcome. For information and the entire semester's schedule\, see the course website: https://www. physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145300Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Zero Days TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220308T230000Z DTEND:20220309T015000Z DTSTAMP:20220808T214455Z UID:39boh5o9auqchm4j9lchsui4u9@google.com CREATED:20220210T145209Z DESCRIPTION:Suvi Gezari presents the film Contact as part of the Science and Society via Film course. All are welcome. For informati on and the entire semester's schedule\, see the course website: https://www.physics.um d.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145209Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Contact TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220301T230000Z DTEND:20220302T015000Z DTSTAMP:20220808T214455Z UID:3npimsl1app1e8voa9jjvgsl16@google.com CREATED:20220210T145045Z DESCRIPTION:Steve Rolston presents the film Silent R unning as part of the Science and Society via Film course. All are welc ome. For information and the entire semester's schedule\, see the course we bsite: http s://www.physics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T145045Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Silent Running TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220215T230000Z DTEND:20220216T015000Z DTSTAMP:20220808T214455Z UID:721c899scethscc55ji05o8ml3@google.com CREATED:20220210T143840Z DESCRIPTION:Juan Uriagereka presents the film Arrival a s part of the Science and Society via Film course. All are welcome. For inf ormation and the entire semester's schedule\, see the course website: https://www.phys ics.umd.edu/hep/drew/spr22/phys298b/ LAST-MODIFIED:20220210T144002Z LOCATION:2208 Edward St. Johns (ESJ) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Sci & Society via Film: Arrival TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220222T160000Z DTEND:20220222T170000Z DTSTAMP:20220808T214455Z UID:4oaktde3nug1ob4jleu16lbgjl@google.com CREATED:20220209T190153Z DESCRIPTION:Title: A field theoretical approach to quantum circuits\nSpeak er: Yunxiang Liao (University of Maryland)\nTime: Tuesday\, February 22\, 2022 - 11:00am\nLocation: ATL 3100A and Virtual Via Zoom: https://umd.zoo m.us/j/91966330464?pwd=STZkS3lCbFFvcjZDeHNXV3BZb05ydz09\n\nQuantum circuits have been widely used as a platform to explore universal properties of gen eric quantum many-body systems. In this talk\, I will present our work in w hich we construct a field theoretical approach to study quantum circuits. W e reformulate the sigma model for time periodic Floquet systems using the r eplica method\, and apply it to the study of spectral statistics of the evo lution operator of quantum circuits. This approach is applicable to a wide class of Floquet circuits\, and allows us to look into the mechanism behind the emergence of universal random matrix behaviors in quantum chaotic syst ems. In the same replica sigma model framework\, we also rederive the Weing arten calculus\, which is a method to evaluate integrals of polynomials wit h respect to Haar measure over compact groups and has wide applications in the studies of quantum circuits.\n LAST-MODIFIED:20220209T190153Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/91966330464? pwd=STZkS3lCbFFvcjZDeHNXV3BZb05ydz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Yunxiang Liao TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220303T123000 DTEND;TZID=America/New_York:20220303T140000 RRULE:FREQ=WEEKLY;UNTIL=20220324T035959Z;BYDAY=TH DTSTAMP:20220808T214455Z UID:6d8mdjorlh5s5vsatbmh8lir9p@google.com CREATED:20220209T173542Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom .us/j/94067038750

Speaker: Jianwei Qiu\, JLab

Title and abstr act: tk
LAST-MODIFIED:20220209T174415Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220214T160000 DTEND;TZID=America/New_York:20220214T173000 DTSTAMP:20220808T214455Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220214T160000 CREATED:20220131T204640Z DESCRIPTION:
Title: \; \;Nematicity and Strain Techniques

Abstract: \; \;"Electronic nematicity is a relatively new t opic of research and is often very relevant to strongly correlated electron systems. Studies show there is interesting interplay between nematicity an d other phases\, like superconductivity\, charge and spin density waves. Ev en without nematic order arising in a system\, nematic fluctuations can hav e strong effects on material properties. I will give a brief introduction t o electronic nematicity and follow up by discussing some commonly used stra in techniques."



In-Person Locati on: Toll Physics Room # 1201
Time: 4pm -5:30pm LAST-MODIFIED:20220209T170217Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Danila Sokratov TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220214T150000 DTEND;TZID=America/New_York:20220214T163000 DTSTAMP:20220808T214455Z UID:3jcjhdprkfbma5ekjv7mj8374k@google.com RECURRENCE-ID;TZID=America/New_York:20220214T150000 CREATED:20220208T193739Z DESCRIPTION:Seminar will be conducted via zoom

Speaker: \; \;Benjamin Lehmann\, UCSC

Titl e: Direct detection of dark matter far from the weak scale

Abstract: The WIMP may not be dead\, but its decline has opened a number of new fron tiers in the search for dark matter. Numerous candidates now line a vast ra nge of scales\, and the weak scale is no longer such a clear guidepost. Thi s is especially problematic for traditional direct detection searches: deca des of development have produced detectors that are extremely sensitive to weak-scale dark matter\, but nearly blind to other important targets. The g rowing scope of our search thus calls for new experimental ideas. I will di scuss a new conceptual framework for the treatment of dark matter--electron interaction rates in condensed matter systems that resolves key theory unc ertainties and opens avenues to probe dark matter at masses several orders of magnitude below existing bounds. In particular\, I will show how the cap abilities of electron-recoil detectors are determined by their dielectric p roperties\, making it possible to easily leverage the complicated many-body physics of detector materials for a new generation of experiments. This no vel formalism is already enabling new approaches to the detection of light dark matter\, and I will share recent results based on the application of t his method to superconducting detectors. These prospects promise to transfo rm direct detection from a surgical instrument at the weak scale to a robus t tool in the search for new physics across the scales.

For zoom lin k please email mknouse@umd.edu
LAST-MODIFIED:20220209T144016Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220131T150000 DTEND;TZID=America/New_York:20220131T163000 RRULE:FREQ=WEEKLY;UNTIL=20220228T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20220207T150000 EXDATE;TZID=America/New_York:20220131T150000 DTSTAMP:20220808T214455Z UID:3jcjhdprkfbma5ekjv7mj8374k@google.com CREATED:20220208T193739Z DESCRIPTION:Speaker: Selim Hotinli\, JHU\n\nTitle and abstract: tk LAST-MODIFIED:20220209T144016Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220211T183000Z DTEND:20220211T193000Z DTSTAMP:20220808T214455Z UID:0la7e430i2g2cjs1d3js613p25@google.com CREATED:20220124T181642Z DESCRIPTION:

Speaker: \; Raffaele D'Agnolo\, I PhT\, Saclay

Seminar will be conducted via zoom.

Preceded by virtual lunch at 12:30pm.

Title: Cosmolog ical Selection of the Weak Scale


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Abstract: I will discuss a new joint solution to the electroweak hi erarchy problem and the strong-CP problem [2106.04591]\, with correlated si gnals in future hadronic EDM experiments and searches for dark matter. In t he second half of the talk\, using the previous mechanism as an example\, I will identify the general features of cosmological selection of the weak s cale. In particular I will introduce the concept of 'weak scale trigger' [2 012.04652] and its phenomenology. Triggers are common to the vast majority of mechanisms that explain the weak scale cosmologically. They give us the opportunity to test this general idea experimentally.
LAST-MODIFIED:20220208T185816Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Online Joint UMD/ Cornell Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220216T160000Z DTEND:20220216T170000Z DTSTAMP:20220808T214455Z UID:07iggfkpk5qbdodrk08cobijj1@google.com CREATED:20220208T183340Z DESCRIPTION:Speaker: \; Professor Bingqing Cheng\, Institute of Science and Technology\, Austria
Web: \;https://sites.google.com/site/tonicbq/people< br>
Title: Predicting Material Properties With the Help of Machine Learn ing

Abstract: A central goal of computational physics and chemistry is to predict material properties using first-principles methods based on t he fundamental laws of quantum mechanics. However\, the high computational costs of these methods typically prevent rigorous predictions of macroscopi c quantities at finite temperatures\, such as chemical potential\, heat cap acity and thermal conductivity. \;In this talk\, I will first discuss h ow to enable such predictions by combining advanced statistical mechanics w ith data-driven machine learning interatomic potentials. As an example\, we computed the phase diagram of water from density functional theory at the hybrid level\, accounting for thermal fluctuations\, proton disordering and nuclear quantum effects. As applications in high-pressure physics\, we sim ulated the high-pressure hydrogen system and found supercritical behaviour above the melting line\, and mapped the phase diagram of superionic water. Besides thermodynamic properties\, I will talk about how to compute the hea t conductivities of liquids just from equilibrium molecular dynamics trajec tories. \;During the second part of the talk\, I will rationalize why m achine learning potentials work at all\, and in particular\, the locality a rgument. I'll show that a machine learning potential trained on liquid wate r alone can predict the properties of diverse ice phases\, because all the local environments characterising the ice phases are found in liquid water.

Virtual Link: \; \;http://go.umd.edu/pchem_seminars LAST-MODIFIED:20220208T183340Z LOCATION:Virtual link below SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220211T180000Z DTEND:20220211T184500Z DTSTAMP:20220808T214455Z UID:5ghb7jnn5cf1imknlpr67brg0q@google.com CREATED:20220208T182757Z DESCRIPTION:Title: Simulation Complexity of Many-Body Localized Systems\nS peaker: Adam Ehrenberg (QuICS)\nTime: Friday\, February 11\, 2022 - 1:00 pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/9616017 7762\n\nWe investigate the difficulty of classically simulating evolution u nder many-body localized (MBL) Hamiltonians. Using the defining feature tha t MBL systems have a complete set of local integrals of motion (LIOMs)\, we demonstrate a transition in the classical complexity of simulating such sy stems as a function of evolution time. On one side\, we construct a quasipo lynomial-time tensor-network-inspired algorithm that can simulate MBL syste ms evolved for any time polynomial in the system size. On the other\, we pr ove that classical simulation becomes formally hard after an exponentially long evolution time\, assuming widely believed conjectures in complexity th eory. If there is time\, we will also discuss the gate complexity of quantu m simulation for MBL systems and show that it is sublinear in evolution tim e.\n\n(Pizza and drinks served after the talk.) LAST-MODIFIED:20220208T182757Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Adam Ehrenberg TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220425T150000Z DTEND:20220425T160000Z DTSTAMP:20220808T214455Z UID:08sp5esbi496qrl2n4ga0c6g8v@google.com CREATED:20220121T183542Z DESCRIPTION:Speaker: Surjeet Rajendran\, Johns Hopkins Universit y

Title: \;A Causal Framework for Non-Linear Quantum Mechanics
Abstract: \;We add non-linear and state-dependent terms to quantu m field theory. We show that the resulting low-energy theory\, non-linear q uantum mechanics\, is causal\, preserves probability and permits a consiste nt description of the process of measurement. We explore the consequences o f such terms and show that non-linear quantum effects can be observed in ma croscopic systems even in the presence of de-coherence. We find that curren t experimental bounds on these non-linearities are weak and propose several experimental methods to significantly probe these effects. We also expose a fundamental vulnerability of any non-linear modification of quantum mecha nics - these modifications are highly sensitive to cosmic history and their locally exploitable effects can dynamically disappear if the observed univ erse has a tiny overlap with the overall quantum state of the universe\, as is predicted in conventional inflationary cosmology. We identify observabl es that persist in this case and discuss opportunities to detect them in co smic ray experiments\, tests of strong field general relativity and current probes of the equation of state of the universe. Non-linear quantum mechan ics also enables novel gravitational phenomena and may open new directions to solve the black hole information problem and uncover the theory underlyi ng quantum field theory and gravitation. \;

Host: Ron Walsworth< /html-blob> LAST-MODIFIED:20220207T180838Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220412T150000Z DTEND:20220412T160000Z DTSTAMP:20220808T214455Z UID:1r3i1umu6vsp3301uisum35ou4@google.com CREATED:20220207T180504Z DESCRIPTION:Speaker: Dr. Dominique Frueh\, Johns Hopkins School of Medicine

Title: TBD

Abstract: \;https:// chem.umd.edu/events/speaker-dominique-frueh LAST-MODIFIED:20220207T180504Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220405T150000Z DTEND:20220405T160000Z DTSTAMP:20220808T214455Z UID:43jgob7fmepirm7u603a184r7c@google.com CREATED:20220207T175756Z DESCRIPTION:Speaker: Dr. Matthew DeLisa\, Cornell University

Title: TBA

Abstract: \;https://chem.umd.edu/eve nts/speaker-matthew-delisa LAST-MODIFIED:20220207T175756Z LOCATION:TBA SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220329T150000Z DTEND:20220329T160000Z DTSTAMP:20220808T214455Z UID:3til551u5p312htsfc77sfvk9g@google.com CREATED:20220207T175348Z DESCRIPTION:Speaker: Dr. Esther Braselmann\, Georgetown University

T itle: TBD


Abstract: \;http s://chem.umd.edu/events/speaker-esther-braselmann LAST-MODIFIED:20220207T175348Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220215T160000Z DTEND:20220215T170000Z DTSTAMP:20220808T214455Z UID:68cm8jkte12jtkp2euli6rn54n@google.com CREATED:20220207T141538Z DESCRIPTION:Speaker: Dr. Fabien Ferrage\, Ecole Normale Superieure\, Paris< br>
Title: Dyamics and Interactions in Biomolecules: Insight from NMR by High-resolution Relaxometry

Abstract: \;https://chem.umd.edu/event s/dynamics-and-interactions-biomolecules-insight-nmr-high-resolution-relaxo metry LAST-MODIFIED:20220207T174018Z LOCATION:IPST Building #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220225T160000Z DTEND:20220225T170000Z DTSTAMP:20220808T214455Z UID:0ka9c76j2beivg95hjblhuld0n@google.com CREATED:20220207T170900Z DESCRIPTION:Title: Fundamental effects of noise and error mitigation on th e trainability of variational quantum algorithms\nSpeaker: Samson Wang (Im perial College London )\nTime: Friday\, February 25\, 2022 - 11:00am\nLoca tion: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/99348805989\n\ nVariational Quantum Algorithms (VQAs) are viewed as amongst the best hope for near-term quantum advantage. A natural question is whether noise places fundamental limitations on VQA performance. In the first part of this talk \, we show that noise can severely limit the trainability of VQAs by expone ntially flattening the optimization landscape and suppressing the magnitude s of cost gradients. Specifically\, for the class of local Pauli noise cons idered\, we prove that the gradient vanishes exponentially in the number of qubits n if the depth of the ansatz grows linearly with n. In the second p art of this talk\, we consider whether error mitigation (EM) techniques can remedy these effects and improve trainability. We find that for a broad cl ass of EM strategies\, these scaling effects due to noise cannot be resolve d without committing exponential resources elsewhere. Moreover\, EM can eve n itself further impair trainability. LAST-MODIFIED:20220207T170900Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/99348805989 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Samson Wang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220210T160000Z DTEND:20220210T170000Z DTSTAMP:20220808T214455Z UID:6458rus2frru8h1i0srf2pu6mo@google.com CREATED:20220207T170515Z DESCRIPTION:Speaker: Dr. Mark Mascal\, UC Davis

Title: Seeing the Bi g Picture on Global Sustainability: How Organic Chemists Can Lead the Charg e Towards Biorefinery-based Solutions

Abstract: TBD \;-&n bsp\;https://chem.umd.edu/events/seeing-big-picture-global-sustainabil ity-how-organic-chemists-can-lead-charge-towards LAST-MODIFIED:20220207T170515Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220208T180000Z DTEND:20220208T190000Z DTSTAMP:20220808T214455Z UID:0hb5svbgdto705red6bvtehblv@google.com CREATED:20220207T170029Z DESCRIPTION:Speaker: PhD Defense: Emily Luteran\, UMCP

Title: Biophy sical and Structural Characterization of the d(CGA) Triplet Repeat Motif

Abstract: \;https://chem.umd.edu/events/biophysical-and-structural-characteri zation-dcga-triplet-repeat-motif LAST-MODIFIED:20220207T170029Z LOCATION:BMS Building\, Room 2118 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220511T160000Z DTEND:20220511T170000Z DTSTAMP:20220808T214455Z UID:0da73nt0alfhmp46rmhmrivqmr@google.com CREATED:20220207T165325Z DESCRIPTION: LAST-MODIFIED:20220207T165325Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220504T160000Z DTEND:20220504T170000Z DTSTAMP:20220808T214455Z UID:3dejkgojr5coup30daoto6fr3r@google.com CREATED:20220207T165300Z DESCRIPTION: LAST-MODIFIED:20220207T165300Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220427T160000Z DTEND:20220427T170000Z DTSTAMP:20220808T214455Z UID:023quvevuklsaqqav6brllsuhi@google.com CREATED:20220207T165233Z DESCRIPTION: LAST-MODIFIED:20220207T165233Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220420T160000Z DTEND:20220420T170000Z DTSTAMP:20220808T214455Z UID:0c5f8utrqj391heg3f1a02te3j@google.com CREATED:20220207T165209Z DESCRIPTION: LAST-MODIFIED:20220207T165209Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220323T160000Z DTEND:20220323T170000Z DTSTAMP:20220808T214455Z UID:4acns3b36huqr65ps9nlfjmft9@google.com CREATED:20220207T165033Z DESCRIPTION: LAST-MODIFIED:20220207T165033Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - SPRING BREAK - NO SEMIN AR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220323T150000Z DTEND:20220323T160000Z DTSTAMP:20220808T214455Z UID:6fker9p1t2vvk6qcac0jfq9aam@google.com CREATED:20220207T163441Z DESCRIPTION: LAST-MODIFIED:20220207T163441Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220316T150000Z DTEND:20220316T160000Z DTSTAMP:20220808T214455Z UID:2i7butld30i3fb4pvkt5n4eio0@google.com CREATED:20220207T163345Z DESCRIPTION: LAST-MODIFIED:20220207T163345Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ChemPhys Joint Seminar - NO SEMINAR (APS MEETING) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220223T160000Z DTEND:20220223T170000Z DTSTAMP:20220808T214455Z UID:7n80b9quav42vc36pn5v7fi47v@google.com CREATED:20220207T162642Z DESCRIPTION: LAST-MODIFIED:20220207T162642Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR (BPS Meeting) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220412T171500Z DTEND:20220412T181500Z DTSTAMP:20220808T214455Z UID:0e6gpbghbv795cercgl5snpgb5@google.com CREATED:20220207T155302Z DESCRIPTION: LAST-MODIFIED:20220207T155302Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220322T171500Z DTEND:20220322T181500Z DTSTAMP:20220808T214455Z UID:7g95ku7o0jul92o72t8sjpsppu@google.com CREATED:20220207T154857Z DESCRIPTION: LAST-MODIFIED:20220207T154857Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - SPRING BREAK - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220216T170000Z DTEND:20220216T180000Z DTSTAMP:20220808T214455Z UID:24f4mu9oh7rbe8tmv0roeukbvf@google.com CREATED:20220207T151746Z DESCRIPTION:Speaker: Elizabeth J. Opila\, Rolls Royce Commonwealth Professo r\, Materials Science and Engineering\, University of Virginia

Title : a Tale of Two "High Entropy" Ceramics

Abstract: “High entropy” cer amics\, more aptly termed multi-principal element ceramics\, provide opport unities for new property achievements. In the first story\, oxidation resis tance of high entropy ultra-high ceramics such as refractory metal (Ti\,Zr\ ,Hf\,Nb\,Ta\,Mo\,W) carbides and borides exposed at temperatures between 15 00C to 1800C will be described. Preferential oxidation\, complex oxide form ation and eutectic liquid formation was observed. In this case\, the high e ntropy concept\, while beneficial for mechanical properties\, resulted in d ecreased oxidation resistance. In a second story\, the design of high entro py rare earth silicates for thermal/environmental barrier coatings to co-op timize the thermochemical stability\, thermomechanical behavior\, and therm al properties will be described. Preliminary results demonstrating successf ul property co-optimization through mixing rare earth cations within silica te phases will be presented. These two tales provide counter-examples of th e challenges and opportunities of utilizing the high entropy approach for m aterials design.

Biography:

Elizabeth Opila is the Rolls-Royce Commonwealth Professor of Materials Science and Engineering and Director of the Rolls-Royce University Technology Center for Advanced Materials System s at the University of Virginia in Charlottesville\, where she has been sin ce 2010. \; Prior to that she held the position of Materials Research E ngineer at the NASA Glenn Research Center in Cleveland\, OH for 19 years wh ere she worked primarily on ceramics for applications in turbine engines\, rocket engines\, hot structures for thermal protections systems\, and other power and propulsion applications. \; Her current research focus inclu des understanding thermodynamic and kinetic mechanisms for material degrada tion in extreme environments\, development of life prediction methodology b ased on understanding of fundamental high temperature chemical reaction mec hanisms\, and materials development for protection of materials from extrem e environments. \; \; Prof. Opila received her BS in Ceramic Engine ering from the University of Illinois\, her MS in Materials Science from th e University of California Berkeley\, and her PhD in Materials Science from the Massachusetts Institute of Technology. \; She is Fellow of the Ame rican Ceramic Society and the Electrochemical Society and recipient of the 2021 American Ceramic Society’s Arthur L. Friedberg Award. \; She has o ver 130 publications\, is editor of 10 proceedings volumes\, and coinventor on six patents. \;

LAST-MODIFIED:20220207T151746Z LOCATION:2110 CHE\, Virtual attendance is also available via Zoom for those who are unable to attend. Please send an email to Sherri Tatum @ statum12@ umd.edu SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220217T160000Z DTEND:20220217T170000Z DTSTAMP:20220808T214455Z UID:0h2045q6f3ih5ajj3kuuv7vl2e@google.com CREATED:20220207T141936Z DESCRIPTION:Speaker: Dr. Claudia Hӧbartner\, Universität Wϋrzburg

Ti tle: TBD


Abstract: \;https: //chem.umd.edu/events/speaker-claudia-hobartner LAST-MODIFIED:20220207T142708Z LOCATION:PLS Building\, Room 1130 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220215T180000Z DTEND:20220215T190000Z DTSTAMP:20220808T214455Z UID:2in6m5gp7ee1a2nv6tggvv1e4o@google.com CREATED:20220207T141228Z DESCRIPTION: LAST-MODIFIED:20220207T141228Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220207T210000Z DTEND:20220207T220000Z DTSTAMP:20220808T214455Z UID:7ofa7dc6a6utc5lu6kf3icj1cv@google.com CREATED:20220127T162527Z DESCRIPTION:

Title: \;Unrav eling Oncogenic Mechanisms with Structures

Speaker:& nbsp\;Ruth Nussinov\, NCI/NIH

Hosted by:&nbs p\;David Fushman

Abstract: \;

Unraveling the activat ion mechanisms and signaling of nodes in the Ras oncogenic network\, includ ing upstream regulators\, and key nodes in the major downstream signaling p athways\, MAPK and PI3K/AKT/mTOR (PTEN) on the molecular level are a challe nging\, yet vastly important aim. Recently we also took up neurodevelopment al disorders\, such as autism\, RASopathies and cerebral palsy aiming to un ravel their linkage to cancer. Mutations in the same genes in the Ras signa ling network\, and even the same mutations\, can lead to both cancer and ne urodevelopmental disorders\, raising the question of how. My talk will desc ribe our progress in both.

Zoom Link:

https://umd .zoom.us/j/97881020532?pwd=L1ArV203ZlBmU1daMUtwd3VzUlppUT< /u>09
Meeting ID: 978 8102 0532
Passcode: 504141


LAST-MODIFIED:20220204T204048Z LOCATION:Online Seminar via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220228T210000Z DTEND:20220228T220000Z DTSTAMP:20220808T214455Z UID:0vginvllu9gop9pm5c9i38j184@google.com CREATED:20220127T162750Z DESCRIPTION:

Title: \;Membrane fus ion: from mechanisms to biological consequences

Speaker: \;Leonid Chernomordik\, NICHD/NIH

Hosted by< /strong>: \;Sergei Sukharev

Abstract: \;

The dyn amic organization of cells and tissues in health and disease depends on pro tein-controlled membrane remodeling processes\, including fusion of intrace llular membranes\, fusion of plasma membranes and fusion mediated by envelo pe proteins of countless viruses. In all fusion processes\, the function of the fusion protein machinery is to drive the transition from the pre-fusio n to post-fusion state by bringing lipid bilayers into immediate contact\, catalyzing the formation of energy-intensive fusion intermediates and drivi ng expansion of a fusion pore. In my talk I plan to briefly summarize the f usion-through-hemifusion pathway of membrane rearrangements discovered in o ur earlier studies that appears to be widely accepted for disparate fusion processes. I will then discuss our work on mechanisms of cell-cell fusion s tage in development and regeneration of skeletal muscles. However\, main fo cus of my talk will be our on-going work on mechanisms of formation of mult inucleated bone-resorbing osteoclasts. We hope that better understanding of the mechanisms that regulate membrane fusion in myogenesis and bone remode ling will facilitate development of new therapeutic strategies for muscle a nd bone diseases.

Location: Conference Room (1116) of the Inst itute for Physical Science and Technology (IPST) Building.




LAST-MODIFIED:20220204T203540Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220215T160000 DTEND;TZID=America/New_York:20220215T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu_R20220215T210000@google.com RECURRENCE-ID;TZID=America/New_York:20220215T160000 CREATED:20200116T204737Z DESCRIPTION:

Title: Life is What?!

Speaker: Sara Imari Walker\, Associate Professor\, School of Earth and Space Exploration\, Arizona State University

Abstract:

Currently\, no general theory exists that explai ns what life is. While many definitions for life do exist\, these are prima rily descriptive\, not predictive\, and they have so far proved insufficien t to explain the origins of life\, or to provide rigorous constraints on wh at properties we might expect all examples of life to share(e.g.\, in our s earch for life in alien environments). In this talk I discuss new approache s to understanding what universal principles might explain the nature of li fe and elucidate the mechanisms of its origins\, focusing on recent work in our group elucidating regularities and law-like behavior of biochemical ne tworks on Earth from the scale of individual organisms to the planetary sca le.
 \;

Host: Graduate Student Co lloquium Committee

https://umd.zoom.us/j/97470621369?pw d=S2V1bmxNeStNTnJmT3JiY1g3TTUvdz09

Meeting ID: 974 7062 1369
Passcode: 581198
LAST-MODIFIED:20220204T202352Z LOCATION: Via Zoom SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220210T173000Z DTEND:20220210T190000Z DTSTAMP:20220808T214455Z UID:0lvc3jchjpqresrvv2pi08svhp@google.com CREATED:20220204T184249Z DESCRIPTION:Speaker: Andy Sheng\, UMD \;

Title: Sigma Models on Quantum Computers

Abstract: Bosonic quantum field theorie s\, even when regularized by a lattice\, possess an infinite dimensional Hi lbert space. Thus\, some further truncation of the field space of the theor y must be made in order to simulate the theory on a quantum computer with a finite number of qubits\, and physical results can only be obtained after a double limit: one to remove the truncation and another to take the contin uum limit. A simpler way is to find a model with a finite dimensional Hilbe rt space belonging to the same universality class as the continuum model so only the space continuum limit is required. We study two ways of truncatin g the 1+1D O(3) nonlinear sigma model\, using ideas from commutative and no ncommutative geometry\, and explore their universalities using calculations with matrix product states.

Seminar will also be streamed via zoom:  \;https://umd.zoom.us/j/94067038750
LAST-MODIFIED:20220204T184249Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220207T160000 DTEND;TZID=America/New_York:20220207T173000 DTSTAMP:20220808T214455Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220207T160000 CREATED:20220131T204640Z DESCRIPTION:
Title: Evolution of Charge Order in Ba(1-x)SrxAl4
Abstra ct: The BaAl4 type structure hosts a variety of interesting and exotic prop erties. Recent results have shown an emergence of CDW order in SrAl4 at 243 K\, together with a hysteretic structural transition at 87K that is thought to be a structural transition to a monoclinic system. The tetragonal struc ture of BaAl4 has also recently been shown to have topologically non-trivia l bands and has lattice parameters very close to SrAl4. In order to study t he interplay between these features we have done a chemical substitution st udy to track the reported transitions. We have performed electrical resisti vity measurements\, along with x-ray and neutron scattering on the Ba(1-x)S rxAl4 family. We show a suppression of the CDW order with increased Ba subs titution. Neutron scattering and x-ray measurements show the nature of the CDW.



In-Person Location: Toll Ph ysics Room # 1201
Time: 4pm -5:30pm

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Zoom LInk: \;https://umd.zoom.us/j/97265681008 LAST-MODIFIED:20220204T165743Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Prathum Saraf TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220210T190000Z DTEND:20220210T203000Z DTSTAMP:20220808T214455Z UID:45i627lrene7c89b3pvrdg6mur@google.com CREATED:20220204T144842Z DESCRIPTION:Title: Probing Quantum Materials With The Lens Of Ma chine Learning \;

Abstract: Despite the significant progress in experimental techniques\, understanding the microscopic interaction mechani sms in a quantum material remains a grand challenge. With monotonically inc reased experimental data\, machine learning(ML) brings new hope and can ser ve as a new probe to study the complex interplay between the charge\, orbit al\, spin\, and lattice degrees of freedom. In this colloquium\, I will int roduce how ML can be used to reveal the hidden information in experimental data and elucidate the quantum materials. I will provide a few examples fro m our research\, that 1) how ML can help identify the proximity effect\, an effect that can lead to dissipationless spintronics or topological quantum computing\, 2) how ML can be used to analyze spectra to reach topological materials classification\, and 3) how ML can result in interfacial defects identification with unprecedented knowledge\, and magnetic structure identi fication through architecture design. We highlight the importance of the re presentations and envision a variety of problems that can benefit from mach ine learning.

[1] \;https://onlinelibrary.wiley.com/doi/10.1002/advs.202004 214 \;

[2] \;https://aip.scitation.org/doi/10.1063/5.0049111

[3]  \;https://arxiv.org/abs/200 3.00994

[4] \;http s://arxiv.org/abs/2109.08005


Host: Jeff Lynn
 \;

V IRTUAL Seminar on Zoom
Meeting \;Link: \; \;https://umd.zoom.us/j/91301075848 LAST-MODIFIED:20220204T155333Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Mingda Li\, MIT (ZOOM) TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220208T160000Z DTEND:20220208T171500Z DTSTAMP:20220808T214455Z UID:2j5an46t18jciqkfio12m65o5r@google.com CREATED:20220131T193120Z DESCRIPTION:Speaker: Dr. Geraldine Seydoux\, Johns Hopkins Unive rsity

Title: Physical Chemistry Meets Biology: RNA Granule Assembly in C. Elegans

Abstract: \;https://chem.umd.edu/events/physical-chemistry-meets-biol ogy-rna-granule-assembly-c-elegans
LAST-MODIFIED:20220203T180331Z LOCATION:IPST Bldg. #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Department of Chemistry & Biochemistry Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220208T160000 DTEND;TZID=America/New_York:20220208T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu@google.com RECURRENCE-ID;TZID=America/New_York:20220208T160000 CREATED:20200116T204737Z DESCRIPTION:

Speaker: Alicia \;Kollár\, UMD
 \;

Title: Circuit QED Lattices

The field of circuit Q ED has emerged as a rich platform for both quantum computation and quantum simulation. Lattices of coplanar waveguide (CPW) resonators realize artific ial photonic materials in the tight-binding limit. Combined with strong qub it-photon interactions\, these systems can be used to study dynamical phase transitions\, many-body phenomena\, and spin models in driven-dissipative systems. I will show that waveguide resonators permit the creation of uniqu e devices which host photons in curved spaces\, gapped at bands\, and novel forms of qubit-qubit interaction. I will show that graph theory is the nat ural language for describing these microwave photonic systems and that comb ining this mathematical tool box with the physics of lattice systems sheds light both on the kinds of devices that are achievable in circuit QED as we ll as open questions in pure and applied mathematics.

 \;

&nbs p\;

LAST-MODIFIED:20220202T210715Z LOCATION:1412 John S. Toll Physics Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220209T203000Z DTEND:20220209T213000Z DTSTAMP:20220808T214455Z UID:0tt2tb0jchlse2c09s2nhin6lv@google.com CREATED:20220201T162026Z DESCRIPTION:Speaker Name: Dominic Payne\, \;University of New Hampshire

Title : Dynamics of `Energization Structures' within the Electron D iffusion Region of Magnetic Reconnection

Abstract : Magnetic reconne ction is a process of rapid magnetic topological change and plasma energiza tion by the reconnecting fields. Reconnection is a ubiquitous process in na tural and laboratory plasmas and is responsible for many of the explosive p henomena observed in the terrestrial magnetosphere and the solar corona. Wh ile it is well-established that reconnection is a plasma energization
pr ocess\, it is still unclear what mechanisms underlie the energy conversion that takes place in the electron diffusion region (EDR)\, where the magneti c fields completely decouple from the plasma particles and magnetohydrodyna mic (MHD) approximations are invalid. Unique "energization structures" near the EDR have been observed in both Magnetospheric Multiscale (MMS) data an d Particle-in-cell (PIC) simulations of magnetic reconnection\, suggesting complex electron-scale dynamics that influence the efficiency of field-to-p lasma energy conversion and the temporal
evolution of the EDR and the x- line.

We begin this seminar with important background on magnetic re connection\, "energization structures" of the diffusion region\, and the MM S mission. Next\, we examine the spatiotemporal evolution of the EDR from a n energy balance perspective by evaluating the terms in
Poynting's theor em in an MMS encounter with a magnetotail EDR and in a
PIC simulation. F inally\, we will again use an MMS event and PIC simulations to study the ph ysics of the outer EDR\, with a particular focus on the development and eff ect of localized "generator" regions
where energized plasma returns some of its energy back to the electromagnetic fields. Our results suggest that the central EDR is characterized by an approximately time-independent bala nce in Poynting's theorem\, whereas near the outer EDR\, there is much more time-dependent energy dissipation as the accelerated electrons begin to re magnetize and mitigate the growth of the reconnection structure.

Hos t Name: Marc Swisdak
Host E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20220201T162026Z LOCATION:Virtual: Contact swisdak@umd.edu for Zoom address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220425T160000 DTEND;TZID=America/New_York:20220425T173000 DTSTAMP:20220808T214455Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com RECURRENCE-ID;TZID=America/New_York:20220425T160000 CREATED:20220131T204640Z DESCRIPTION: LAST-MODIFIED:20220131T205404Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Jingnan Cai TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220207T160000 DTEND;TZID=America/New_York:20220207T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20220503T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20220502T160000 EXDATE;TZID=America/New_York:20220418T160000 EXDATE;TZID=America/New_York:20220314T160000 EXDATE;TZID=America/New_York:20220321T160000 DTSTAMP:20220808T214455Z UID:7li9qtmdguk0jsi3l4igeb482h@google.com CREATED:20220131T204640Z DESCRIPTION: LAST-MODIFIED:20220131T204640Z LOCATION:Toll Physics Room # 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Prathum Saraf TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220209T170000Z DTEND:20220209T180000Z DTSTAMP:20220808T214455Z UID:3bviounqb7tnut2f3n70lbmitc@google.com CREATED:20220131T192738Z DESCRIPTION:Speaker: Ekaterina Pomerantseva\, MSE Associate Professor\, Dre xel University

Title: Chemical Preintercalation Synthesis of Versati le Electrode \;Materials for Electrochemical Energy Storage

Abst ract: Chemical preintercalation synthesis approach is based on low-temperat ure sol-gel or precipitation process\, and it involves incorporation of ino rganic or organic ions into the structure of the growing oxide phase prior to electrochemical cycling. In this presentation\, Dr. \;Pomerantseva w ill show that chemical preintercalation is a versatile method that can be u sed for the synthesis of a wide family of new oxide phases with layered str uctures\, two-dimensional heterostructures and nanocomposites. She will pre sent the effect of chemically preintercalated ions on electrochemical perfo rmance of these new electrode materials in intercalation batteries. Stabili zation effect enabled by the insertion of electrochemically inactive ions w ill be discussed. Additionally\, the effect of low-temperature annealing on electrochemical stability and rate capability will be shown. Morphological diversity of the chemically preintercalated oxides will be revealed by dis cussing the role of the precursor. \;Pomerantseva will show that chemic al preintercalation of organic molecules can be used to prepare hybrid phas es and nanocomposites. She will also demonstrate the first exfoliation of b ilayered vanadium oxide leading to the formation of free-standing films com posed of ultrathin nanoflakes. The materials and methods developed in this work have the potential to enable next-generation energy storage technologi es.

Bio:

Ekaterina Pomerantseva is an Associate Professor of Materi als Science and Engineering at Drexel University. She received a B.S. degre e in Materials Science in 2000\; an M.S. degree in Chemistry and Materials Science in 2003 from Lomonosov Moscow State University\; an M.S. degree in Biochemistry in 2005 from McGill University\, and a Ph.D. degree in Solid-S tate Chemistry in 2007 from Lomonosov Moscow State University.

Prior to joining Drexel\, \;Pomerantseva held postdoctoral appointments in t he Institute for Systems Research at the University of Maryland College Par k (2010 – 2013) and the Department of Chemistry at the University of Waterl oo (2009 – 2010). She has co-authored over 70 journal papers. In 2018\,&nbs p\;Pomerantseva was selected to receive a prestigious NSF CAREER award\, an d she is also a Scialog Fellow and Stein Fellow.

Since 2018\, \;P omerantseva has been a senior investigator member of the m2M Center for Mes oscale Transport Properties\, a U.S. Department of Energy\, Office of Scien ce funded Energy Frontiers Research Center. Her research interests lie in t he discovery and development of new solutions and next generation systems f or sustainable energy and clean environment\, with the focus on materials c hemistry and electrochemistry as it relates to energy storage and water tre atment. \;Pomerantseva leads a Material Electrochemistry Group\, the me mbers of which design and apply chemical synthesis methods to obtain materi als with the desired structure and advanced electrochemical properties\, br idging the gap between chemistry and materials science. Her group develops chemical pathways that can be used to realize materials with tunable struct ures and compositions that exhibit high affinity towards ions in solutions\ , rapid electron and ion transport\, and enhanced electrochemical stability . These properties are needed to realize electrochemically-driven energy st orage and water purification devices with high performance.

LAST-MODIFIED:20220131T192738Z LOCATION:2110 CHE and Virtual attendance is also available via Zoom for tho se who are unable to attend. Please send an email to Sherri Tatum @ statum1 2@umd.edu SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220208T180000Z DTEND:20220208T191500Z DTSTAMP:20220808T214455Z UID:72i2ig7pejkdqpp8ink5lsn4jp@google.com CREATED:20220131T192138Z DESCRIPTION:Speaker: Professor Ichiro Takeuchi\, UMD\n\nTitle: Closed-Loop Autonomous Combinatorial Experimentation for Streamlined Materials Discover y\n\nAbstract: Machine learning has become an integral part of many aspects of fundamental research. It is particularly useful in high-throughput mate rials exploration where it can be used to predict and navigate a series of experiments\, as well as perform rapid data analysis. In this talk\, I will discuss how we are incorporating active learning in combinatorial screenin g and discovery of functional materials. The array format with which a larg e number of different composition samples are laid out on combinatorial lib raries is particularly conducive to active learning driven autonomous exper imentation. We have previously demonstrated discovery of a new phase change memory (PCM) material using the closed-loop autonomous materials explorati on and optimization (CAMEO) strategy. The discovered PCM material has been tested in various scaled-up device formats and continues to exhibit superio r performance to industrial standards. Recent efforts in developing live au tonomous synthesis–measurement as well as experiment-theory closed loops wi ll be discussed. This work is performed in collaboration with A. Gilad Kusn e\, V. Stanev\, H. Yu\, H. Liang\, M. Li\, E. Pop\, and A. Mehta. This work is funded by SRC\, ONR\, AFOSR\, and NIST. LAST-MODIFIED:20220131T192138Z LOCATION:IPST Bldg. #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220207T200000Z DTEND:20220207T213000Z DTSTAMP:20220808T214455Z UID:5cfkebfejek73gj2fi2u0etkbt@google.com CREATED:20220131T160248Z DESCRIPTION:Seminar will be conducted via zoom.

Speaker: Daniel Green\, UC San Diego

Title: Non-Gaussianity in Maps of the La rge Scale Structure


Abstract: Equilateral non-Gaussianity is a c ompelling observational target for CMB and LSS surveys. Unfortunately\, pr ogress in measuring non-Gaussianity is expected to be limited by our abilit y to accurately model the distribution of galaxies in the universe. In this talk\, I will discuss how these challenges could be overcome using the ful l maps of large scale structure. I will explain how the special nature of the equilateral signal protects it from being corrupted by nonlinear evolut ion. This suggests that a map level approach to LSS could dramatically imp act the search for primordial non-Gaussianity.

For zoom link please email mknouse@umd.edu
LAST-MODIFIED:20220131T160248Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220204T180000Z DTEND:20220204T184500Z DTSTAMP:20220808T214455Z UID:1qe42ccl369qreh4vkaebolrfv@google.com CREATED:20220131T153355Z DESCRIPTION:Title: Boson Sampling for Generalized Bosons
Spe aker: En-Jui Kuo (QuICS)
Time: Friday\, February 4\, 2022 - 1:00pm
Lo cation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762

We generalized the standard Boson sampling task including Linear Boson Sampling the Gaus- sian Boson Sampling from photons to what we call genera lized boson system which the computation relation between the creation and annihilation operators is not a constant. We showed that in such a system\, one still has the standard hardness results including Hafnian and Permanen ts. We also use the spin system as our example and provide an experimental setup.
LAST-MODIFIED:20220131T154752Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: En-Jui Kuo TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220214T213000Z DTEND:20220214T223000Z DTSTAMP:20220808T214455Z UID:69jb13qfd1h1htj51v9hq3v02i@google.com CREATED:20220121T200337Z DESCRIPTION:Title: Searches for Other Spacetime Sirens

Speaker: Peter Shawhan\, UMD Department of Physics

Abstract: Co mpact binary mergers are the only type of gravitational wave signal that ha ve been directly detected so far. While that has enabled spectacular discov eries -- and even a measurement of the Hubble constant from the "standard s iren" property of a binary merger -- the data from LIGO and Virgo is also b eing searched for other types of signals. In this talk I would like to focu s attention on searches for continuous-wave gravitational waves\, which wou ld be emitted by a rapidly rotating neutron star that is not quite axisymme tric. These searches can take advantage of integrating over long data sets\ , but only if Doppler shifts and amplitude modulation of the continuously e mitted "siren" are properly taken into account. The potentially huge comput ational demands of doing that have led to the development of different stra tegies for different science targets. I will describe the astrophysical sou rces\, the data analysis methods\, and several search results which have re cently been released.

Notes: \;Join the meeting at 4:15 for meet and greet
Visit \;ht tps://bit.ly/2PmJoT6 \;for access
LAST-MODIFIED:20220129T163222Z LOCATION:Online via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220202T203000Z DTEND:20220202T220000Z DTSTAMP:20220808T214455Z UID:6326a6cqbpmf6gseshdcr2irl0@google.com CREATED:20220127T174317Z DESCRIPTION:
Please join us for the LPS Seminar Series on Wednesday\, Fe bruary 2nd\, 2022
 \;
“Quantum error correction on a superconducting system with heavy hexagon topology”
 \;
Maika Takita\, IBM Quantum
 \;
Abstract: Superconducti ng qubit based systems have made tremendous strides in device performance\, from improved coherences to lowered single- and two-qubit gate errors\, an d high-fidelity mid-circuit measurements and qubit resets. In this talk\, I will present recent progress towards fault tolerant quantum error correcti on on superconducting qubit systems\, that leverages the resources from imp roved device performance. I will focus on experimental demonstrations on a heavy-hexagon topology\, an arrangement that reduces lattice connectivity c ompared to other popular low-degree parity-check codes in order to mitigate cross-talk between fixed-frequency transmon qubits. I will describe some o f the encoding\, syndrome extraction\, and decoding operations that can be tailored to this topology\, focusing on d = 2 and 3 codes. The code design\ , along with the current level of hardware noise\, place this system in a v ery favorable path for the coming years in the quest for scalable\, fault-t olerant quantum error correction. \;Our results and preliminary simulat ions highlight not only the versatility and flexibility of the underlying h eavy-hexagon topology\, but also the importance of tailoring a decoder when implementing these protocols. \;
 \;

Bio: \; Maika T akita is a Research Staff Member at IBM Quantum\, with expertise in experim ental quantum computation. She joined IBM in 2015 after completing her Ph.D . in Electrical Engineering from Princeton University. Takita specializes i n the control\, characterization\, and benchmarking of multi-qubit quantum systems. As a co-PI of IARPA's LogiQ program\, she is also leading a team t owards implementing fault tolerant quantum error correction codes on superc onducting qubit lattices.
 \; \; \; \;

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LAST-MODIFIED:20220127T174317Z LOCATION:WebEx: https://lpscp.webex.com/lpscp/j.php?MTID=m1879d554593a0e0e3 f7d9c21683be665 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar\, Quantum error correction on an SC system with heavy h exagon topology\, Maika Takita\, IBM Quantum\, Wednesday\, February 2nd\, 2 022 3:30 PM TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220202T170000Z DTEND:20220202T180000Z DTSTAMP:20220808T214455Z UID:1abmmd2rmlnm6hsns7oeti6qvj@google.com CREATED:20220125T140858Z DESCRIPTION:Speaker: Amit Agrawal\, Visiting Fellow and Associat e Research Scientist\, IREAP/NIST

Title: Novel Nanophotonic Interfac es to Quantum Systems: Material Challenges and Opportunities

Abstrac t: \;
Over the last decade\, flat optical elements composed of an array of deep-subwavelength dielectric or metallic nanostructures of nanoscale thicknesses – referred to as metasurfaces – have revolutionized t he field of optics. Because of their ability to impart an arbitrary phase\, polarization or amplitude modulation to an optical wavefront as well as pe rform multiple optical transformations simultaneously on the incoming light \, they promise to replace traditional bulk optics in applications requirin g compactness\, integration and/or multiplexing. Recent demonstrations incl uding imaging\, polarimetry\, quantum-light generation and LIDAR demonstrat e the range of technologies where metasurfaces have already had a significa nt impact. In this talk\, we first demonstrate the versatility of metasurfa ces as a compact\, efficient and multifunctional interface to trap atoms fo r application in quantum information science and atomic clocks. In another integration step\, combining metasurfaces with integrated photonic circuits promises increased complexity and functionality in a batch-fabricated opti cal microsystem. Finally\, we will discuss material and photonic-loss chall enges that must be overcome for successful realization of a fully integrate d quantum system based on cold atoms or solid-state qubits.


Biography :

Amit Agrawal is a project leader at NIST in Gaithersburg\, MD\, an d an Associate Research Scientist at the IREAP of the University of Marylan d\, College Park. He received his Ph.D. in Electrical Engineering from the University of Utah in 2008\, followed by a Postdoc at NIST/UMD. He then joi ned the faculty of Syracuse University in 2011\, as the John E. and Patrici a Breyer Professor of Electrical Engineering. He has been back at NIST/UMD since 2014\, where his group is developing novel nanophotonic devices\, ope rating from the near-infrared to deep-ultraviolet frequencies\, for providi ng arbitrary control over the linear and nonlinear properties of light in s pace and in time. His current work is focused on developing functional inte grated nanophotonic systems for applications ranging from imaging to quantu m-optics.

LAST-MODIFIED:20220127T160546Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220207T160000Z DTEND:20220207T170000Z DTSTAMP:20220808T214455Z UID:0gf407ig36vsb4sucnsrgau16c@google.com CREATED:20220121T183403Z DESCRIPTION:Speaker: Vinod Menon\, City College of New Yo rk

Title: \;Strong exciton-photon interaction in van der Waals m aterials

Abstract: \;Strong exciton-photon interaction results i n the formation of half-light half-matter quasiparticles called exciton-pol aritons (EPs) that take on the properties of both its constituents. In this talk\, I will first introduce polariton formation in 2D semiconductors &nb sp\;[1] followed by a discussion of Rydberg excitons \;[2] and dipolar excitons  \;[3] to realize highly nonlinear interactions to achieve pol ariton blockade. Following this\, I will discuss the use of strain to contr ol exciton flow and nonlinear response  \;[4]. \; Finally\, I will present some recent results on EPs in correlated van der Waals materials an d their potential to realize hybridization between excitons\, photons and m agnons.

[1]X. Liu et al.\, Nat. Photonics 9\, 30 (2015).

[2 ]J. Gu et al.\, Nat. Commun. 12\, 2269 (2021).

[3]B. Datta et al.\, A rXiv2110.13326 (2021).

[4]F. Dirnberger et al.\, Sci. Adv. 7\, 3066 ( 2021).


Host: Mohammad Hafezi
LAST-MODIFIED:20220126T145435Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220204T180000Z DTEND:20220204T190000Z DTSTAMP:20220808T214455Z UID:6ahe1eb3plhcamiuva02ec0bdl@google.com CREATED:20220126T144314Z DESCRIPTION:Speaker: \; \;En-Jui Kuo (UMD)
Title:& nbsp\; \;Boson Sampling for Generalized Bosons
Abstract:  \; \;We generalized the standard Boson sampling task including Linear B oson Sampling the Gaus- sian Boson Sampling from photons to what we call ge neralized boson system which the computation relation between the creation and annihilation operators is not a constant. We showed that in such a syst em\, one still has the standard hardness results including Hafnian and Perm anents. We also use the spin system as our example and provide an experimen tal setup.

broadcast on Zoom: \;https://umd.zoom.us/j/9616017 7762

(pizza and drinks served after the talk) LAST-MODIFIED:20220126T144434Z LOCATION:ATL 2324 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: En-Jui Kuo (UMD) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220214T160000Z DTEND:20220214T170000Z DTSTAMP:20220808T214455Z UID:1bo88eegp2of28coktfres4jr4@google.com CREATED:20220121T183417Z DESCRIPTION:Speaker: Michael Huber\, National Institute of Stand ards and Technology

Title: \;The Many Facets of Neutron Pendellö sung Interference

Abstract: Neutron interferometry is practiced with de Broglie wavelengths of 0.1 nanometer over path lengths of 0.1 meter\, t ypically in Mach-Zehnder configurations familiar to practitioners of atom a nd optical interferometry. However\, since ordinary matter is largely trans parent to neutrons\, their interference can be manifested deep within mater ials. \; \;Neutrons undergoing Bragg diffraction experience a type of oscillation inside a crystal known as pendellösung interference [1] whic h results in a modulation of the forward-diffracted and Bragg-reflected int ensities. \; This phenomenon allows for the precise determination of th e neutron-silicon structure factor. \; Knowing the structure factor at several Bragg conditions strongly constraints possible atomic length scale interactions\; aka a "fifth" force. \; In addition\, structure factor m easurements probe the structure of the neutron via the neutron charge radiu s and provide information on thermal motion of the atoms in a lattice.  \;

[1] "Pendellösung interferometry probes the neutron char ge radius\, lattice dynamics\, and fifth forces\," B. Heacock\, \;et al.\, \;Science \;373\, 1239 (2021)


H ost: Charles Clark
LAST-MODIFIED:20220125T192134Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220128T180000Z DTEND:20220128T184500Z DTSTAMP:20220808T214455Z UID:6fdd1mbl8hqtsoq04mvemton2d@google.com CREATED:20220125T175841Z DESCRIPTION:Title:  Empirical Evaluation of Circuit Approximations o n Noisy Quantum Devices
Speaker:  Ellis Wilson (NCSU)
Time:  Friday\, January 28\, 2022 - 1:00pm
Location:  Virtual Via Zoom: https://umd.zoom.us/j/96160177 762

Noisy Intermediate-Scale Quantum (NISQ) device s fail to produce outputs with sufficient fidelity for deep circuits with m any gates today. Such devices suffer from read-out\, multi-qubit gate and c ross-talk noise combined with short decoherence times limiting circuit dept h. This work develops a methodology to generate shorter circuits with fewer multi-qubit gates whose unitary transformations approximate the original r eference one. It explores the benefit of such generated approximations unde r NISQ devices. Experimental results with Grover'\;s algorithm\, multipl e-control Toffoli gates\, and the Transverse Field Ising Model show that su ch approximate circuits produce higher fidelity results than longer\, theor etically precise circuits on NISQ devices\, especially when the reference c ircuits have many CNOT gates to begin with. With this ability to fine-tune circuits\, it is demonstrated that quantum computations can be performed fo r more complex problems on today'\;s devices than was feasible before\, sometimes even with a gain in overall precision by up to 60\\%.

< /u>
Note: This seminar is part of a collaboration between RQS Ins titutions and will be made available to all RQS members. LAST-MODIFIED:20220125T175841Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/96160177762 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Ellis Wilson TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220420T193000Z DTEND:20220420T203000Z DTSTAMP:20220808T214455Z UID:7sefgkufo0qsu858v9of9c66mt@google.com CREATED:20220125T164904Z DESCRIPTION:Daniel Andruczyk\, University of Illinois

Can the Helium Ash Problem be Solved Using Flowing Liquid L ithium?

One of the challenges that future nuclearfusion dev ices will have is how to remove the helium "ash" that isgenerated from the fusion reaction\, this will be important for mostfusion reactions\, DT\, DD and PB11 . Though helium is integral toheating and maintaining a burning fusion plasma\, eventually it willhave to be removed [1]. Its interaction w ith solid surfaces liketungsten can cause problems. It can be either retain ed within thesurface causing defects and eventual failure\, but also create smalltendrils called fuzz which can be source of dust and impurities intot he plasma. However\, the biggest issue is that once the helium losesits ene rgy to the plasma it will be come cold as it interacts with asurface\, and it becomes an impurity and recycling gas. What this doesis provides a path for energy losses from the core plasma since nowthe energy is going into he ating cold atoms at the plasma edge andthis cause steep temperature and pre ssure gradients that causeinstabilities and plasma collapse. Back in the mi d 2000's it wasdemonstrated at the Center for Plasma Material Interactions (CPMI) onthe Flowing Lithium Retention Experiment (FLiRE) device that flowi ngliquid lithium will trap and transport helium. This was performed withdif ferentially pumped chambers which were sealed off by a flowingliquid lithiu m plug and helium ion gun as the source [2-4]. With thefocus on plasma mat erial Interactions (PMI)\, CPMI acquired the formerWEGA stellarator from Ma x-Plank Institute for Plasma PhysicsGreifswald in 2014. This was done to ha ve our own toroidal fusiondevice that can operate in steady state to do PMI without the longwait to get time on other machines. The Hybrid Illinois De vice forResearch and Applications (HIDRA) is l = 2\, m = 5 classicalstellar ator that can operate steady state. Typical plasma dischargelength is from tpulse = 40 s - 1000 s\, with magnetic fields up to B0 =0.5 T. Heating on H IDRA is via ECRH with up to 26 kW of 2.45 GHzmicrowave magnetron sources. T ypical operating parameters for HIDRA ina standard discharge are Te <\;= eV\, Ti <\;= 3 eV and ne <\;= 5*10^18 m-3[5\,6]. Aside from PMI HIDRA i s also a grad educational resourceallowing graduate and undergraduate stude nts to learn the ropes offusion and train the next generations of fusion an d plasma scientistsand engineers [7-9]. Recently the first liquid lithium c ampaign wasundertaken on HIDRA. A specific material analysis tool (HIDRA-MA T) wasdeveloped for this\, where not only can liquid lithium be places onto asurface and exposed to a plasma\, but there are some basic surfaceanalyse s that can be performed on the samples as well including\, LIBS\,LIDA\, TDS and RGA [10\,11]. The Initial lithium campaign was performedin a helium pl asma where a droplet of ~100 mg of liquid lithium wasplaced on a tungsten s urface and exposed. The results were dramaticwhere the background neutral h elium\, the recycling gas\, essentiallydisappeared. The lithium was able to reduce the recycling by over 90%[12]. This seemed to back up the results t hat were found inFLiRE. Follow up experiments in the lithium evaporation ex perimental(LEEX) campaign where W-Li surfaces were exposed at differentdist anced from the plasma edge show that there is indeed a real effectwhen enou gh lithium can get into the plasma edge and ionize\, butwithout replacing t he core plasma. Future campaigns are planned tolook at the same effect in h ydrogen isotope plasmas (H and D) as wellmixtures of plasmas (H/D\, H/He\, D/He) and the effect on the plasmawith lithium. The plasma performance usin g lithium increaseddramatically. Temperatures were 50 eV <\;= Te <\;= 1 00 eV\, Ti up to 10 eV\,and densities only slightly dropping to ne = 2*10^1 8 m-3 due to thereduction in recycling and impurities. This talk will focus on theHIDRA results with lithium and helium\, as this has been the biggest surprise with it being accepted knowledge that Li and He would notinteract\ , this disproves this assumption. The implications for futureplasma facing surfaces (PFC) are significant as it potentially showsthat a fusion reactor work will only happen with some sort of flowingliquid lithium wall or dive rtor [1].

References
[1] A. de Castro et al.\, Physics of Plasma\ , 28 (2020) 050901.
[2] J. P. Allain et al.\, Fusion Engineering and Des ign\, 61-62 (2002) 245.
[3] M. Nieto et al.\, Journal of Nuclear Materia ls\, 350 (2006) 101.
[4] R. Stubbers et al.\, Journal of Nuclear Materia ls\, 337-339 (2005) 1033.
[5] D. Andruczyk et al.\, Fusion\, Science and Technology\, 68 (2015) 497.
[6] D. Andruczyk et al.\, Physics Scripta\, T171 (2020) 014067.
[7] D. Johnson et al.\, Fusion Engineering and Desi gn\, 128 (2018) 215.
[8] R. Rizkallah et al.\, IEEE Transactions on Plas ma Physics\, 46(7) (2018) 2685.
[9] R. Rizkallah et al.\, Physics of Pla smas\, 26 (2019) 092503.
[10] A. Shone et al.\, Journal of Fusion Energy \, 39 (2020) 448.
[11] A. Shone et al.\, Fusion Engineering and Design\, (2021) Submitted\, Under Review.
[12] D. Andruczyk et al.\, Plasma Phys ics and Controlled Fusion\, (2022) Submitted. Under Review. LAST-MODIFIED:20220125T173335Z LOCATION:Virtual\; contact Marc Swisdak swisdak@umd.edu SEQUENCE:3 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20220127T203000Z DTEND:20220127T213000Z DTSTAMP:20220808T214455Z UID:3uuf1q9p9jlug48j4pmj6l0i5h@google.com CREATED:20220125T172337Z DESCRIPTION:RIT on Geometry and Physics organization meeting for Spring 202 2

This will be an organizational meeting for a seminar (shared by m ath\, applied math\, and physics) on topics in mathematical physics with a geometrical component. Interested students can get course credit.
Con tact Dr. Jonathan Rosenberg at jmr@umd.edu for more info and Zoom link.
If you are interested in participating\, please fill out the survey at https://umdsurvey.umd.edu/jfe/form/SV_3qIE8HsZa9YL 9Iy LAST-MODIFIED:20220125T172337Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:RIT on Geometry and Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220131T200000Z DTEND:20220131T213000Z DTSTAMP:20220808T214455Z UID:7ckh614844o0j20jg54j3clt66@google.com CREATED:20220104T152758Z DESCRIPTION:Speaker: Dawid Brzeminski\, UMD\n\nTitle and abstract: tk LAST-MODIFIED:20220125T142438Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220202T160000Z DTEND:20220202T170000Z DTSTAMP:20220808T214455Z UID:12v4h98fudnp6v18nb869tadma@google.com CREATED:20220125T134629Z DESCRIPTION: LAST-MODIFIED:20220125T134629Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220201T181500Z DTEND:20220201T191500Z DTSTAMP:20220808T214455Z UID:09u3d208mcck7dures4a2toovn@google.com CREATED:20220125T134541Z DESCRIPTION: LAST-MODIFIED:20220125T134541Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220131T210000Z DTEND:20220131T220000Z DTSTAMP:20220808T214455Z UID:715d3nfr3umh7nkmg9rtq9hbdo@google.com CREATED:20220124T162937Z DESCRIPTION:

Title: \;Using Computer Simulations to Advance our Understanding of Biological Systems at the Atomic Level

< strong>Speaker: \;Benoit Roux\, University of Chicago

Hosted by: \;Pratyush Tiwary

Abstract: \;

Classical molecular dynamics simulations based on atomic models pl ay an increasingly important role in a wide range of applications in physic s\, biology and chemistry. The approach consists of constructing detailed a tomic models of the macromolecular system and\, having described the micros copic forces with a potential function\, using Newton's classical equation\ , F=MA\, to literally "simulate" the dynamical motions of all the atoms as a function of time. The calculated trajectory\, though an approximation to the real world\, provides detailed information about the time course of the atomic motions\, which is impossible to access experimentally. Specialized free energy simulations are also an important route to establish a strong connection to experiments. The development of efficient methods for simulat ing slow conformational transitions is another subject of great interest in computational studies of biomolecular system. A powerful paradigm for mapp ing the conformational landscape of biomolecular systems is to combine free energy methods\, transition pathway techniques and stochastic Markov State Model based massively distributed simulations. These concepts will be illu strated with a few recent computational studies of Src tyrosine kinases\, K + channels\, and the P-type ion pumps.


Zoom Link:

< a href="https://umd.zoom.us/j/99887431513?pwd=b295MmtEWjJKUG1KWFpVdWh6T0NzQ T09">https://umd.zoom.us/j/99887431513?pwd=b295MmtEWjJKUG1KWFpVdW h6T0NzQT09
Meeting ID: 998 8743 1513
Passcode: 715773




LAST-MODIFIED:20220124T163252Z LOCATION:Online Seminar via Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220301T170000Z DTEND:20220301T190000Z DTSTAMP:20220808T214455Z UID:4r6v603ftpib84hrbm3ksubo48@google.com CREATED:20220121T185334Z DESCRIPTION:An industry is emerging to develop practical applica tions of the quantum computing\, communication and networking concepts that have emerged during the past 25 years. \; We will hear of opportunitie s and challenges in this field from two industry leaders:

  • Za chary Dutton\, Business Lead\, Physical Sciences and Systems\, Raytheon BBN Technologies\, Cambridge\, MA. Zac has a distinguished record of research in quantum physics\, some of which was performed when he was a NIST Nationa l Research Council Postdoctoral Research Associate\, 2002-2004
  • Alir eza Shabani \;is a scientist and an entrepreneur\, currently the head o f Quantum Research at Cisco. Prior to joining Cisco\, he built Qulab\, a ph arma startup levering AI and quantum chemistry to automate drug design. He was also a senior scientist at Google Quantum AI Lab. His research has been at the intersection of quantum physics\, engineering\, and biology.”
  • < /ul>Attendance at Joint Quantum Institute Career Seminars is restricted to junior affiliates (students\, postdoctoral associates and staff) of the Uni versity of Maryland or the National Institute of Standards and Technology.< br>
    Host: Charles Clark LAST-MODIFIED:20220124T144230Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Career Seminar: The Emerging Quantum Industry TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220127T190000Z DTEND:20220127T200000Z DTSTAMP:20220808T214455Z UID:4fgpd46grl930akcp7agghb28i@google.com CREATED:20220122T021009Z DESCRIPTION:Title: A direct product theorem for quantum communication comp lexity with applications to device-independent QKD\nSpeaker: Srijita Kundu (University of Waterloo)\nTime: Thursday\, January 27\, 2022 - 2:00pm\nLo cation: Virtual Via Zoom: https://uwaterloo.zoom.us/j/98736830982?pwd=d212 aDVlZU8vaHUxTkJkeWVFSGRLZz09\n\nWe give a direct product theorem for the en tanglement-assisted interactive quantum communication complexity in terms o f the quantum partition bound for product distributions. The quantum partit ion or efficiency bound is a lower bound on communication complexity\, a no n-distributional version of which was introduced by Laplante\, Lerays and R oland (2012). For a two-input boolean function\, the best result for intera ctive quantum communication complexity known previously was due to Sherstov (2018)\, who showed a direct product theorem in terms of the generalized d iscrepancy. While there is no direct relationship between the maximum distr ibutional quantum partition bound for product distributions\, and the gener alized discrepancy method\, unlike Sherstov’s result\, our result works for two-input functions or relations whose outputs are non-boolean as well.\n\ nAs an application of our result\, we show that it is possible to do device -independent quantum key distribution (DIQKD) without the assumption that d evices do not leak any information after inputs are provided to them. We an alyze the DIQKD protocol given by Jain\, Miller and Shi (2020)\, and show t hat when the protocol is carried out with devices that are compatible with several copies of the Magic Square game\, it is possible to extract a linea r (in the number of copies of the game) amount of key from it\, even in the presence of a linear amount of leakage. Our security proof is parallel\, i .e.\, the honest parties can enter all their inputs into their devices at o nce\, and works for a leakage model that is arbitrarily interactive\, i.e.\ , the devices of the honest parties Alice and Bob can exchange information with each other and with the eavesdropper Eve in any number of rounds\, as long as the total number of bits or qubits communicated is bounded.\n\nBase d on https://arxiv.org/abs/2106.04299\, which is joint work with Rahul Jain . LAST-MODIFIED:20220122T021009Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/98736830982?pwd=d212 aDVlZU8vaHUxTkJkeWVFSGRLZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Srijita Kundu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220124T144500Z DTEND:20220124T153000Z DTSTAMP:20220808T214455Z UID:6cdrhfhgcfjlj9uidhj7a5r04i@google.com CREATED:20220121T184145Z DESCRIPTION:Speaker: Lin Xin\, Georgia Institute of Techn ology

    Title: Squeezed Ground States in a Spin-1 Bose-Einstein Conden sate

    Abstract: We find a fast non-adiabatic protocol for the creatio n of spin squeezed ground states in a spin-1 Bose condensate and experiment ally generate those states near the quantum critical point between the pola r and ferromagnetic quantum phases of the interacting spin ensemble. The me thod consists of a pair of controlled quenches of an external magnetic fiel d\, which has the same leading order dependence for the total time as the q uantum optimal control method but is simpler and realizable. In contrast to typical non-equilibrium methods for preparing atomic squeezed states by qu enching through a quantum phase transition\, squeezed ground states are tim e-stationary and remain squeezed for the lifetime of the condensate. A sque ezed ground state with a metrological improvement up to 6-8 dB and a consta nt squeezing angle maintained over 2s is demonstrated.

    Biography: Li n Xin is a graduate student at Georgia Tech\, School of Physics\, working i n Prof. Michael Chapman's Bose-Einstein condensation (BEC) laboratory. His research focuses on many-body interaction in ultracold atoms. He received h is B.S. in physics with the highest honors from Shanghai Jiaotong Universit y in 2016\, where he worked on theoretical ultrafast AMO physics.

    Ho st: Ian Spielman \;

    Online: \;https://umd.zoom.us/j/7984811536
    LAST-MODIFIED:20220121T184223Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220131T160000Z DTEND:20220131T170000Z DTSTAMP:20220808T214455Z UID:7u35hss7sbs6dm1fnqflpahbu4@google.com CREATED:20220121T183334Z DESCRIPTION:Speaker: Cheng Gong\, Department of Electrical and C omputer Engineering and Quantum Technology Center\, University of Maryland\ , College Park

    Title: Efficient Control of Two-Dimensional Magnetism

    Abstract: Emergent two-dimensional (2D) atomic crystals [1\,2] hold great promise for efficient control of magnetism\, fundamentally owing to the 2D nature. However\, thus far\, there have been only proof-of-concept r eports on electrical and optical control of 2D magnetism\, and there appear to be some fundamental obstacles for the efficient control. In this talk\, I will analyze the challenges and present our recent theoretical and exper imental progress on efficient electrical and optical control of 2D magnetis m [3-5]. Specifically\, our results show that the continuous wave laser of 10s of \;mW/(mm)2 \;can effectively change the domain be haviors in 2D magnets\, and 100 mV/nm electric field can effectively change the magnetic anisotropy of 2D magnets. We envision the efficient control o f 2D magnets could open new avenues for the low-power spintronics and photo nics.

    1. \; \; \; \; \; C. Gong et al. \;Natur e \;546\, 265-269 (2017).

    2. \; \; \;  \; \; C. Gong\, X. Zhang. \;Science \;363\, eaav4 450 (2019).

    3. \; \; \; \; \; C. Gong\, et al.&nb sp\;Nature Communications \;10\, 2657 (2019).

    4.&nb sp\; \; \; \; \; S.-J. Gong\, et al. \;PNAS  \;115\, 8511-8516 (2018).

    5. \; \; \; \; \ ; E.-W. Du\, et al. \;Nano Letters \;20\, 7230-7236 ( 2020).


    Host: Charles Clark
    LAST-MODIFIED:20220121T183334Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220126T203000Z DTEND:20220126T213000Z DTSTAMP:20220808T214455Z UID:4f8rlrrmanfkfpe0urerh7kpr3@google.com CREATED:20220120T210156Z DESCRIPTION:

    Please join us for our first in 2022 seminar next Wednesday January 26 at 3:30 PM

    OPTICAL QUANTUM INTERCONNECT S FOR SUPERCONDUCTING QUANTUM PROCESSORS

    Alp Sipahigil\, Univ ersity of California\, Berkeley

    Abstract: \;The ab ility to store\, transfer\, and process quantum information promises to tra nsform how we calculate\, communicate\, and measure. In the past two decade s\, superconducting microwave circuits based on Josephson junctions emerged as a powerful platform for quantum computation. However\, these systems op erate at low temperatures and microwave frequencies\, and require coherent optical interconnects to transfer quantum information across long distances . In this talk\, I will present our recent experiments demonstrating the tr ansduction of a superconducting qubit excitation to an optical photon. I wi ll present an integrated device platform combining superconducting qubits\, piezoelectric transducers\, and optomechanical transducers for converting quantum states between superconducting circuits\, single phonons\, and sing le optical photons. I will discuss how we use nanomechanical oscillators in their quantum ground states to convert single photons from microwave frequ encies to the optical domain. I will conclude by discussing the prospects o f this approach for realizing future quantum communication networks based o n superconducting quantum processors.

    Bio: \;Alp S ipahigil is an Assistant Professor of Electrical Engineering and Computer S ciences at the University of California\, Berkeley\, the Chang Hui Faculty Fellow\, and Co-Director of Berkeley Sensor and Actuator Center (BSAC). He has joint appointments as a Faculty Scientist at the Materials Sciences Div ision at Lawrence Berkeley National Laboratory and a supporting appointment at UC Berkeley Physics. His research is in solid-state quantum technologie s\, with a focus on hybrid quantum devices based on superconducting qubits\ , nanomechanics\, nanophotonics\, and atom-like defects in solids. Prior to joining Berkeley in 2021\, he was an Institute for Quantum Information and Matter postdoctoral scholar at Caltech. He received his Ph.D. in Physics f rom Harvard University in 2017 and his B.S. degrees in Physics and Electric al Engineering from Bogazici University in 2010.

     \;

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    LAST-MODIFIED:20220121T134420Z LOCATION:WebEx: https://lpscp.webex.com/lpscp/j.php?MTID=mc83a2e410a4507b02 c7d9228706fa329 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar Series: OPTICAL QUANTUM INTERCONNECTS FOR SUPERCONDUCTI NG QUANTUM PROCESSORS TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220201T160000 DTEND;TZID=America/New_York:20220201T170000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu@google.com RECURRENCE-ID;TZID=America/New_York:20220201T160000 CREATED:20200116T204737Z DESCRIPTION:

    Speaker: John Mather\ , NASA

    Title: Progress towards Opening the Infrared Treasure Chest with JWST

    Abstract: The long-awaited James Webb Space Teles cope was launched on Dec. 25\, 2021 and is well along in its trip to L2. Wi th its 6.5 m deployable primary mirror\, and cameras and spectrometers cove ring 0.6 to 28 µm\,it promises extraordinary improvements in observing capa bilities. Webb will be able to observe the first objects that formed after the Big Bang\, the growth of galaxies\, the formation of stars and planetar y systems\, individual exoplanets through coronography and transit spectros copy\, and all objects in the Solar System from Mars on out. It could obser ve a 1 cm2 bumblebee at the Earth-Moon distance\, in reflected s unlight and thermal emission. I will show the mission status\, and review t he observatory capabilities and planned observing program.The Webb is a joi nt project of NASA with the European and Canadian space agencies. I will al so note the possibilities for the next generation of ground-based telescope s with adaptive optics\, including orbiting laser guidestars and an orbitin g starshade for direct observation of exoplanets.

    Host: Drew Bade n

    ********Because of a home basketball game on Feb. 1\, no parking accommodations can be made for visiting attendees. ********

    LAST-MODIFIED:20220121T134036Z LOCATION:Toll Building Room 1412 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220215T160000 DTEND;TZID=America/New_York:20220215T170000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20220510;BYDAY=TU EXDATE;TZID=America/New_York:20220503T160000 DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu_R20220215T210000@google.com CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220120T142620Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20220201T160000 DTEND;TZID=America/New_York:20220201T170000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20220215T045959Z;BYDAY=TU DTSTAMP:20220808T214455Z UID:kknibohbd9t9bufs91o0o2ogpu@google.com CREATED:20200116T204737Z DESCRIPTION:

    Speaker: John Mather\, NASA

    Title: Progress towards Opening the Infrared Treasure Chest with JWST

    Abstract: The long-awaited James Webb Space Telescope was launched on Dec. 25\, 2021 and is well along in its trip to L2. With its 6.5 m deployable primary mirr or\, and cameras and spectrometers covering 0.6 to 28 µm\,it promises extra ordinary improvements in observing capabilities. Webb will be able to obser ve the first objects that formed after the Big Bang\, the growth of galaxie s\, the formation of stars and planetary systems\, individual exoplanets th rough coronography and transit spectroscopy\, and all objects in the Solar System from Mars on out. It could observe a 1 cm2 bumblebee at t he Earth-Moon distance\, in reflected sunlight and thermal emission. I will show the mission status\, and review the observatory capabilities and plan ned observing program.The Webb is a joint project of NASA with the European and Canadian space agencies. I will also note the possibilities for the ne xt generation of ground-based telescopes with adaptive optics\, including o rbiting laser guidestars and an orbiting starshade for direct observation o f exoplanets.

    Host: Drew Baden

    LAST-MODIFIED:20220120T142620Z LOCATION:Toll Building Room 1412 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210928T160000 DTEND;TZID=America/New_York:20210928T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210928T160000 CREATED:20200116T204737Z DESCRIPTION:Speaker: S. James Gate s\, Jr.\, Brown University and the University of Maryland
     \;
    Title: Perspective on John S. Toll’s “OmniPolym athism” From An Age Of Skepticism
     \;
    A bstract: I first met John S. Toll during the late nineteen eighties during the time he was leading the University Research Associates (URA) while it s ought to build the Superconducting Super Collider. Had it been built\, the ‘Higgs Boson\,’ an elementary particle\, would have been discovered in the USA\, not at the Large Hadron Colliderin Europe. One night in the physics d epartment\, I saw an elderly gentleman and wondered whether he was lost. Li ttle did I know then\, this man was the creator of the modern University of Maryland. I learned this and many more things later.
      \;
    This talk is a presentation about some of these lessons.
     \;
    Read more about the Toll Lectur e: https://umdphysics.umd.edu/about-us/news/department-news/172 4-lius-toll.html
    LAST-MODIFIED:20220120T142431Z LOCATION:1412 Toll SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium: John S. Toll Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211012T160000 DTEND;TZID=America/New_York:20211012T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211012T160000 CREATED:20200116T204737Z DESCRIPTION:
    Sharon Glotzer\, University of Michigan  \;
    Paint Branch Lecture Seri es
    To be held in 1101 A. James C lark Hall \;
     \;
    < span>Order\, disorder and the entropic bond: The Truth About Entropy


    Entropy is typically associated with disorder\; ye t\, the counterintuitive notion that particles with no interactions other t han excluded volume might self-assemble from a fluid phase into an ordered crystal has been known since the mid-20th century. First predicted for rods \, and then spheres\, the thermodynamic ordering of hard particle shapes by nothing more than crowding is now well established. In recent years\, surp rising discoveries of entropically ordered colloidal crystals of extraordin ary structural complexity have been predicted by computer simulation and ob served in the laboratory. Colloidal quasicrystals\, clathrate structures\, and structures with large and complex unit cells typically associated with metal alloys can all self-assemble from disordered phases of identical nano particles due solely to entropy maximization. In this talk\, we show how en tropy alone can produce order and complexity beyond that previously imagine d. \; We introduce the notion of the \;entropic bond\, and show how methods used by the quantum community to predict atomic crystal structures can be used to predict entropic colloidal crystals.



    https://ireap.u md.edu/




    LAST-MODIFIED:20220120T142431Z LOCATION: 8278 Paint Branch Dr\, College Park\, MD 20742 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium/Paint Branch Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211207T160000 DTEND;TZID=America/New_York:20211207T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211207T160000 CREATED:20200116T204737Z DESCRIPTION:Distinguished Scholar-Teacher Lecture

    Professor Peter Shawhan
     \;
    The Simple (and Not-So-Simple) Phy sics of Detecting Gravitational Waves
     \;
    The 2015 det ection of gravitational waves\, from a pair of black holes orbiting each ot her and then merging\, stands out as a triumph of experimental physics.&nbs p\; It was accomplished with the highly sophisticated LIGO detectors which use laser interferometry\, a far cry from the more basic resonant detectors that UMD's Joe Weber first used to hunt for gravitational waves. \; Bo th techniques\, however\, rely on simple physics principles\, and most of t he sophistication is just there to keep the measurement as simple as possib le. \; In this talk aimed at a wide audience\, I will take time to expl ain the basic properties of gravitational waves and how they can be measure d\, and highlight some of the beautifully simple -- but extremely important -- physics at work in the detectors. \;
     \;
    ht tps://umdphysics.umd.edu/about-us/news/department-news/1712-shawhan-dst.htm l
     \;
     \; LAST-MODIFIED:20220120T142431Z LOCATION:1412 Toll SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium/DST Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211026T160000 DTEND;TZID=America/New_York:20211026T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211026T160000 CREATED:20200116T204737Z DESCRIPTION:Speaker\, Charles Kane\, University of Pennsylvania

    T he Emergence of Topological Quantum Matter
     \;

    Abstract: Matter can arrange itself in the most ingenious ways. In addition to the solid\, liquid and gas phases that are familiar in class ical physics\, electronic phases of matter with both useful and exotic prop erties are made possible by quantum mechanics. In the last century\, the th orough understanding of the simplest quantum electronic phase - the electri cal insulator - enabled the development of the semiconductor technology tha t is ubiquitous in today's information age. In the present century\, new "t opological" electronic phases are being discovered that allow the seemingly impossible to occur: indivisible objects\, like an electron or a quantum b it of information\, can be split into two\, allowing mysterious features of quantum mechanics to be harnessed for future technologies. Our understandi ng of topological phases builds on deep ideas in mathematics. We will try t o convey that they are as beautiful as they are fundamental.

    https://umdphysics.umd.edu/about-us/news/department-news/1745-kane-p range.html LAST-MODIFIED:20220120T142431Z LOCATION:1412 Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium - Prange Prize Lecture TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201124T160000 DTEND;TZID=America/New_York:20201124T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201124T160000 CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220120T142431Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium - None scheduled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201020T160000 DTEND;TZID=America/New_York:20201020T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201020T160000 CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220120T142431Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium - None scheduled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201006T160000 DTEND;TZID=America/New_York:20201006T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201006T160000 CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220120T142431Z LOCATION:1412 Toll Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium - None scheduled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211102T160000 DTEND;TZID=America/New_York:20211102T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211102T160000 CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220120T142431Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium - Cancelled TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211019T160000 DTEND;TZID=America/New_York:20211019T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211019T160000 CREATED:20200116T204737Z DESCRIPTION:

    Title: \; \;Structural Color - Origin and Evolution in Nature

    Speaker: Hui Cao\, Department of Appli ed Physics\, Yale University

    Abstract:

    St ructural color originates from physical interaction of light with nanostruc tures. Most studies so far have focused on ordered structures which produce iridescent colors that change with viewing angle. However\, nature has use d extensively quasi-ordered structures to create weakly iridescent colors. An interdisciplinary team\, consisting of optical physicists\, material sci entists\, and biologists at Yale\, has investigated the physical mechanism for coloration of nanostructures with short-range order in bird feather bar bs. Inspired by nature\, a simple technique is developed to fabricate large -scale biomimetic films which display isotropic structural color\, that is amenable to potential applications in coatings\, cosmetics\, and textiles. In order to understand how the structural color evolves in nature\, artific ial selection has been conducted on a lab model butterfly to evolve the str uctural color of wing scales and compared to natural selection. This study reveals the physical mechanism of structural color evolution\, which stands in sharp contrast to pigment color evolution

    Registration is required for this event: http://science.umd.edu/events/pai-2021.html

    LAST-MODIFIED:20220120T142431Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium (IPST Shih-I Pai Lecture) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210126T160000 DTEND;TZID=America/New_York:20210126T170000 RRULE:FREQ=WEEKLY;UNTIL=20220201T045959Z;BYDAY=TU EXDATE;TZID=America/New_York:20220125T160000 EXDATE;TZID=America/New_York:20220118T160000 EXDATE;TZID=America/New_York:20220111T160000 EXDATE;TZID=America/New_York:20220104T160000 EXDATE;TZID=America/New_York:20211228T160000 EXDATE;TZID=America/New_York:20211221T160000 EXDATE;TZID=America/New_York:20211214T160000 EXDATE;TZID=America/New_York:20211130T160000 EXDATE;TZID=America/New_York:20210831T160000 EXDATE;TZID=America/New_York:20210824T160000 EXDATE;TZID=America/New_York:20210817T160000 EXDATE;TZID=America/New_York:20210810T160000 EXDATE;TZID=America/New_York:20210803T160000 EXDATE;TZID=America/New_York:20210727T160000 EXDATE;TZID=America/New_York:20210720T160000 EXDATE;TZID=America/New_York:20210713T160000 EXDATE;TZID=America/New_York:20210706T160000 EXDATE;TZID=America/New_York:20210629T160000 EXDATE;TZID=America/New_York:20210622T160000 EXDATE;TZID=America/New_York:20210615T160000 EXDATE;TZID=America/New_York:20210608T160000 EXDATE;TZID=America/New_York:20210601T160000 EXDATE;TZID=America/New_York:20210525T160000 EXDATE;TZID=America/New_York:20210511T160000 EXDATE;TZID=America/New_York:20210504T160000 EXDATE;TZID=America/New_York:20210316T160000 EXDATE;TZID=America/New_York:20210302T160000 EXDATE;TZID=America/New_York:20210216T160000 EXDATE;TZID=America/New_York:20210209T160000 EXDATE;TZID=America/New_York:20210126T160000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220120T142431Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211109T160000 DTEND;TZID=America/New_York:20211109T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211109T160000 CREATED:20200116T204737Z DESCRIPTION:Speaker: Pierre Sikivie\, University of Florida\n\nTitle: Axi on Dark Matter\n\nAbstract:\nThe axion is a hypothetical particle motivated by the Strong CP Problem\nof elementary particle physics and by the dark m atter problem of cosmology.\nCold dark matter axions are naturally produced during the QCD phase\ntransition in the early universe by a process of vac uum realignment.\nThey may be detected on Earth by converting them to photo ns in an\nelectromagnetic cavity permeated by a strong magnetic field. I'l l\ndescribe various axion detection techniques and report on experimental\n efforts under way. Finally we will consider the question whether axionsmay behave differently from other forms of dark matter on astronomical scales. LAST-MODIFIED:20220120T142431Z LOCATION:Toll Building Room 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211005T160000 DTEND;TZID=America/New_York:20211005T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211005T160000 CREATED:20200116T204737Z DESCRIPTION:Speaker: Marianna Safronova\, University of Delaware\n\nTitle: Quantum Technologies for New-physics Discoveries\n\nAbstract: The extraordi nary advances in quantum control of matter and light have been transformati ve for atomic and molecular precision measurements enabling probes of the m ost basic laws of Nature to gain a fundamental understanding of the physica l Universe. Exceptional versatility\, inventiveness\, and rapid development of precision experiments supported by continuous technological advances an d improved atomic and molecular theory led to rapid development of many ave nues to explore new physics. I will give a broad overview of atomic and mol ecular physics searches for physics beyond the standard model. Several exam ples will be highlighted\, including searches for permanent electron electr ic-dipole moment that probe new TeV-scale physics\, dark matter searches wi th atomic and nuclear clocks\, and new ideas in gravitational wave detectio n with atomic quantum sensors.\n \nHosted by Steve Rolston LAST-MODIFIED:20220120T142431Z LOCATION:Toll Building Rm 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210921T160000 DTEND;TZID=America/New_York:20210921T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210921T160000 CREATED:20200116T204737Z DESCRIPTION:No colloquium on September 21. LAST-MODIFIED:20220120T142431Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210914T160000 DTEND;TZID=America/New_York:20210914T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210914T160000 CREATED:20200116T204737Z DESCRIPTION:


    Javad Shabani\, Center for Quantum Phenomena\, Ph ysics Department\, New York University

    Title: Towards Topological Superconductivity in Epitaxial Superconductor-Semicond uctor Materials Systems

    Abstract: \;A central goal in condensed matter physics is to understand and control the order par ameter characterizing the collective state of electrons in quantum heterost ructures. For example\, new physical behaviors can emerge that are absent i n the isolated constituent materials.  \;With regards to superconductiv ity this has opened a whole new area of investigation in the form of topolo gical superconductivity. \;This type of superconductivity is expected t o host exotic quasi-particle excitations including Majorana bound states wh ich hold promise for fault-tolerant quantum computing. In this talk\, we fi rst discuss the important role of epitaxial superconductor-semiconductor hy brid systems as an enabling materials platform. We present unprecedented va lues of transparency and induced gap that could allow us to reach into prev iously unexplored parameter regimes. In wide Josephson junctions exposed to magnetic field\, we observe a minimum of critical current accompanied with a phase jump in the superconducting phase. We discuss this observation as a signature of a transition between trivial and topological superconductivi ty. These findings in addition to new directions in proximitizing edge mode s reveal a versatile two-dimensional platform to explore mesoscopic and top ological superconductivity.

    Host: Johnpierre Paglione LAST-MODIFIED:20220120T142431Z LOCATION:Toll Building - Room 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210907T160000 DTEND;TZID=America/New_York:20210907T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210907T160000 CREATED:20200116T204737Z DESCRIPTION:Manuel Franco Sevilla\, University of Maryland

    Title:&nb sp\;New physics in B decays? Challenges to Lepton Flavor Universality from LHCb and the B factories

    Abstract: Since the establish ment of the \;Standard Model (SM) \;many decades ago\, the three ty pes of charged leptons (electron\, muon\, and tau) have been seen as doppel gängers of each other in everything but their readings on the scale. That i s\, the SM interactions of the three lepton families with other \;parti cles \;differ only because of their different masses. This resulting (a ccidental) symmetry is known as Lepton Flavor Universality (LFU). Since 201 2\, however\, a series of measurements of decays \;involving \;tree -level \;b \;→ \;cτν \;and loop-level \;b \; → \;sℓℓ \;transitions (the so-called "B anomalies") have repeatedly hinted at the possibility that lepton \;universality may be\, in fact\ , violated. This pattern was reinforced in March 2021 when LHCb \;repor ted the first \;deviation from the SM \;by more than 3σ \;in a single LFU observable\, one which is affected by negligible theoretical unc ertainties. In this talk I will go over \;the current status of LFU mea surements as well as their compatibility with exotic leptoquarks\, and will briefly review the prospects for the upcoming \;LHCb and Belle II data sets to resolve the anomalies one way or another.
     \;
    Refreshm ents will be offered at 3:30 p.m. in the small plaza outside the lecture ro om doors (facing Regents Drive and the Plant Sciences Bldg.) LAST-MODIFIED:20220120T142431Z LOCATION:Toll Building - Room 1410 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210504T160000 DTEND;TZID=America/New_York:20210504T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210518T160000 CREATED:20200116T204737Z DESCRIPTION:RECORDING LINK
    https://umd.hosted.panopto.com/Panopto /Pages/Viewer.aspx?id=4b6f1646-608e-41ef-bc2a-ad1e016ec875

    Join Zoom Meeting
    https://umd.zoom.us/j/99484232905?pwd=SjZ1dFRDVG1ObTY2MDE zYjdMY2o1UT09


    Meeting ID: 994 8423 2905
    Passcode: 942935< br>
    Speaker: Sergey Frolov\, University of Pittsburgh

    Title: How do we discover Majorana particles in nanowires?

    Abstract: Majorana p articles are real solutions of the Dirac equation\, representing their own antiparticles. In the condensed matter context\, Majorana refers to electro nic modes in nanostructures described by peculiar ‘pulled-apart’ wavefuncti ons and by hypothesized non-Abelian exchange. This last property makes them interesting for quantum computing. I will present our efforts to generate and verify Majorana modes in semiconductor nanowires coupled to superconduc tors. In particular\, how can we tell Majorana signatures apart from simila r Andreev states that do not have non-Abelian properties? While we may not have a verified Majorana observation now\, I will talk about ways to get th ere: through careful experiments\, improved nanowires and device fabricatio n and with eyes open for alternative explanations.

    Host: Vladimir Ma nucharyan LAST-MODIFIED:20220120T142431Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210427T160000 DTEND;TZID=America/New_York:20210427T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210427T160000 CREATED:20200116T204737Z DESCRIPTION:RECORDING LINK
    https://umd.hosted.panopto.com/Panopto /Pages/Viewer.aspx?id=b3eed653-1b9d-4aea-ad17-ad170168141d

    Zoom Link :
    https://umd.zoom.us/j/91263501883?pwd=dEMvYk9HWk5XNERCTExWQ2tyT kNNUT09

    Meeting ID: 912 6350 1883
    Passcode: 788984

    Spe aker: Dmitry Pushin\, IQC Waterloo


    Title: \;Applicati ons of structured matter and light waves

    Abstract: \;Since the ir experimental demonstrations a quarter-century ago there has been great p rogress in the generation\, detection\, and applications of \;“structur ed waves” \;of light and quantum particles\, where the wavefront is pat terned to attain nontrivial propagation characteristics such as orbital ang ular momentum (OAM)\, nondiffraction\, and self-healing. The structured OAM light waves have demonstrated a number of applications in microscopy\, enc oding and multiplexing of communications\, and manipulation of matter. In t his talk\, I will cover some recent advances in the preparation and applica tion of spin coupled OAM beams\, for both neutrons and light. In the case o f light\, we are exploring a unique application of retinal imaging and dete ction of age-related macular degeneration. In the case of neutrons\, we loo k at probing emerging quantum materials with interesting topological featur es.


    Host: Charles W Clark LAST-MODIFIED:20220120T142431Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210420T160000 DTEND;TZID=America/New_York:20210420T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210420T160000 CREATED:20200116T204737Z DESCRIPTION:

    ZOOM Recording: https://umd.hosted.panopto.com/Panopt o/Pages/Viewer.aspx?id=a8babc64-a0db-4f20-83ae-ad1001634de7

    Join Zoom Meeting

    https://umd.zoom.us/j/98778035497?pwd=eEFXbDlqNFUx MFFxR0Q1MUx4TUhvZz09

    Meeting ID: 987 7803 5497

    Passcode : 634184

    Host: Dr. Charles Clark

    Speaker: Dr. William Ratcliff< /p>

    Title: “Investigations of the first intrinsic topological insulator: MnBi2Te4”

    Abstract: In this talk\, I discuss our recent results on the first intrinsic antiferromagnetic topological insula tor\, MnBi2Te4. In this Van der Waals material\, we can control the magneti c state through chemical substitution\, as well as through the application of a magnetic field. \; These knobs allow us to effect the topology of the band structure and thus the transport. \; We apply a number of prob es\, including transport\, susceptibility\, neutron scattering\, ARPES\, an d TEM to determine the physics of this exciting material [1\,2].

    < /u>

    "Spin Scattering and noncollinear spin-structure induced i ntrinsic anomalous Hall Effect in antiferromagnetic topological insulator M nnBi2Te4\, Seng Huat Lee et al\, Phys. Rev. Research 1\, 012011 (2019)

    < p>

    "Ferromagnetism in van der Walls compound MnSb1.8Bi.2Te4" Y angyang Chen et al\, Phys. Rev. Matt. 4\, 064411 (2020)

    LAST-MODIFIED:20220120T142431Z LOCATION:Virtual SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210413T160000 DTEND;TZID=America/New_York:20210413T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210413T160000 CREATED:20200116T204737Z DESCRIPTION:Join Zoom Meeting
    https://umd.zoom.us/j/94377670746?pw d=RlViaDUxc01aNTFqREFLQjlzditUQT09

    Meeting ID: 943 7767 0746
    Passcode: 786118

    Speaker: Mimi Hiebert\, UMD

    Title: The Urani um Club: Tracking Down Lost Radioactive Relics from World War II
    Abstrac t: \;
    At the end of World War II\, a top secret scientific intellige nce mission\, code named Alsos\, was commissioned with the goal of assessin g the state of the German nuclear program. \; What they found when they arrived in the small town of Haigerloch in Germany’s Black Forest\, was a deep pit in the floor of an old monastery wine cellar and 664\, five centim eter cubes of uranium buried in a nearby field. \; These were the remai ns of Werner Heisenberg’s final\, failed attempt at building a functioning nuclear reactor.

    To the Alsos Mission members\, the con formation found at Haigerloch\, that the German program had failed at comin g anywhere close to creating a sustained nuclear reaction\, much less an at omic bomb\, was surprising. \; Germany was not only the birthplace of a tomic physics\, but the German program had also held a nearly two year head start over the Manhattan Project. \; Miscalculations\, infighting betw een the scientists and mismanagement from the Nazi government\, all combine d to ensure the failure of Germany’s nuclear ambitions. The contrasts that can be drawn between the German nuclear program and the Manhattan Project p rovide lessons in both science and scientific management.

    The majority of the uranium cubes found at Haigerloch have largely been lost to history. \; One\, however\, made its way to the collection of D r. Tim Koeth\, sparking a years-long research project seeking to investigat e how many cubes still remain\, where they are now\, and what stories they might reveal along the way.


    Host: Tim Koeth LAST-MODIFIED:20220120T142431Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210406T160000 DTEND;TZID=America/New_York:20210406T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210406T160000 CREATED:20200116T204737Z DESCRIPTION:ZOOM RECORDING
    https://umd.hosted.panopto.com/Panopto/Page s/Viewer.aspx?id=7d7c0c33-4626-46a1-8d38-ad02016e15ba



    Join Zoom Meeting
    https://umd.zoom.us /j/99541808638?pwd=VnYrU3d5NmRYelhPZzFxSEhPUFlFZz09

    < b>Meeting ID: 995 4180 8638

    Passcode: 025342

    Title: \;How to enhance physics by making it inclusive

    Speaker: \;Chandralekha Singh\, Department of Physics and Astron omy\, University of Pittsburgh

    Abstract: \;Physics facult y members often only focus on content and pedagogical approaches to improve student engagement and learning in physics courses. However\, students’ mo tivational characteristics can also play an important role in their engagem ent and success in physics. For example\, students’ sense of belonging in a physics class\, their self-efficacy\, and views about whether intelligence in physics is “fixed” or “malleable” can affect engagement and learning. T hese types of concerns can especially impact the learning outcomes of women and racial/ethnic minority students and stereotype threats can exacerbate these issues. In this colloquium\, I will discuss prior research studies th at show how different types of social psychological interventions (e.g.\, s ocial belonging and growth mindset) have improved the motivation and learni ng outcomes of all students\, especially women and underrepresented minorit ies in STEM fields. These interventions include providing data to students about how intelligence is malleable and one can become an expert in a disci pline by working hard in a deliberate manner\, sharing with the students ex amples of testimonials of past students with diverse backgrounds who strugg led initially but then succeeded by working hard and using deliberate pract ice. I will discuss how these ecological interventions were adapted and imp lemented in our physics classes. These types of interventions are short\, r equiring less than one hour of regular class time even though they have the potential to impact student outcomes significantly—especially for women an d other underrepresented students in physics classes. These findings also h ave implications for effectively mentoring students who are doing research in physics. LAST-MODIFIED:20220120T142431Z LOCATION:Zoom Conference SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210330T160000 DTEND;TZID=America/New_York:20210330T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210330T160000 CREATED:20200116T204737Z DESCRIPTION:ZOOM RECORDING
    https://umd.hosted.panopto.com/Panopto /Pages/Viewer.aspx?id=f6bcbb54-df95-4893-b034-acfb01671671

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    https://umd.zoom.us/j/92195226516?pwd=a3NjYTNpUWI5Y1NYdXF vT2ZlK1ZiZz09


    Meeting ID: 921 9522 6516
    Passcode: 065736< br>
    Speaker: Edmund Bertschinger\, MIT

    Title: How Departments Cha nge: A Cautionary Example

    Abstract: Among the major research univers ities in the 1970s and 1980s\, MIT had an unusually large (though still sma ll) percentage of women and African Americans as both faculty and students in its physics department. This talk discusses how this happened\, why it e nded\, and how this information guided later change efforts. The answers go far beyond one physics department to include biologists\, university presi dents\, and two US presidents.

    Host: Sarah Eno LAST-MODIFIED:20220120T142431Z LOCATION:zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210323T160000 DTEND;TZID=America/New_York:20210323T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210323T160000 CREATED:20200116T204737Z DESCRIPTION:

    Meeting Recording Link: https://umd.hosted.panopto.co m/Panopto/Pages/Viewer.aspx?id=f6e2e112-f3d5-4359-8be3-acf40164a61a

    J oin Zoom Meeting

    https://umd.zoom.us/j/92360965134?pwd=WjI3 ZDhCTlRFQTZ4TTFXTFBGMVhQQT09

    Meeting ID: 923 6096 5134

    Passcode: 89593

    Gianpaolo Carosi

    Lawrence Livermore Nationa l Laboratory


    Title: \;“Tuning into the Dark Matter Axi on” \; \; \; \;

    Abstract: \; The nature of dark matter is one of the deepest mysteries in physics and co smology. A preponderance of indirect evidence points to it being compose of new particles beyond the standard model. The Axion\, which arises as a byp roduct of explaining why the neutron doesn’t have a measurable dipole momen t\, is one very well-motivated candidate. The Axion Dark Matter Experiment (ADMX) is the DOE High Energy Physics flagship search for axions in the US and is based  \;at the University of Washington in Seattle. ADMX uses a large microwave cavity immersed in a strong static magnetic field to reson antly convert dark matter axions to detectable photons. Recently ADMX has c ompleted its first set of data runs with unprecedented sensitivity in the c lassical QCD-axion mass range of several µeV and is continuing to take data in a previously unexplored region of parameter space. In this talk I will describe the history of axion dark matter searches\, describe the recent AD MX results and near term search prospects and give a survey of the R&\;D efforts currently underway to explore the entire axion dark matter mass wi ndow.

     \;Hosted by Anson Hook

    LAST-MODIFIED:20220120T142431Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210309T160000 DTEND;TZID=America/New_York:20210309T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210309T160000 CREATED:20200116T204737Z DESCRIPTION:

    ZOOM RECORDING

    https://umd.hosted.panopto.com/P anopto/Pages/Viewer.aspx?id=817925c7-215d-4876-aa36-ace6016efc19

    Zoom Meeting

    https://umd.zoom.us/j/94996221043?pwd=SmtsNWFhS3Z4 RkNlQnBEd3dZOWVaQT09

    Meeting ID: 949 9622 1043

    Passcode: 695798

    Speaker: James Drake< /p>

    Title: Magnetic Reconnection and Particle Acceleration in space and a strophysical systems

    Abstract: \;

    Magn etic reconnection is responsible for the explosive release of \;magneti c energy in space and astrophysical systems. Such impulsive \;energy re lease spans a wide variety of environments throughout the \;universe\, including solar and stellar flares\, flares in pulsar \;nebulae\, jets in active galactic nuclei and other astrophysical systems. What controls th e dynamics of reconnection and the mechanisms responsible for efficient par ticle acceleration are therefore topics \;of great scientific interest\ , especially in light of the goal to \;interpret simultaneous observati ons of gravitational waves and \;electromagnetic signatures in astrophy sical events. Observations reveal that a large fraction of released magneti c energy goes into \;energetic particles\, whose distributions take the form of power laws \;that extend many decades in energy. Theoretical i deas about the \;mechanism that drives these energetic particles during reconnection \;have changed dramatically over the past decade. Early i deas that parallel electric fields were the dominant driver have been displ aced by a new picture in which the growth and merging of large numbers of m agnetic flux ropes both release magnetic energy and efficiently drive energ y gain of particles. New computational and analytic models are for the firs t time reproducing the extended power laws seen in observations. The talk w ill emphasize basic physical concepts that reveal both the physics of magne tic reconnection and the mechanisms for particle energy gain.Host: W illiam (Bill) Dorland LAST-MODIFIED:20220120T142431Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210223T160000 DTEND;TZID=America/New_York:20210223T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210223T160000 CREATED:20200116T204737Z DESCRIPTION:Meeting Recording: https://umd.hosted.panopto.com/Panopt o/Pages/Viewer.aspx?id=75dcd4be-b896-4983-83bb-acd801778030

    Zoom lin k: https://umd.zoom.us/j/92661457651?pwd=RTI5OXZ4azFZRnVyRExubjlzS1l3 Zz09

    Meeting ID: 926 6145 7651
    Passcode: 89593

    Speake r: William Detmold\, MIT

    Title: The secret life of quarks

    Abs tract: Quarks and gluons are the fundamental constituents of most of the vi sible matter in the Universe but they are never detected directly in experi ment. Understanding how protons\, neutrons\, nuclei and their more exotic c ousins emerge from the quantum fluctuations of quarks and gluons is a grand challenge in theoretical physics. At the same time\, quarks and gluons hol d they key to interpreting some of the most sensitive searches for new phys ics beyond the paradigm of the Standard Model of particle physics. I will e xplore how calculations on the worlds largest supercomputers are providing insight into the emergence of the structure of matter and the nature of nuc lei at their deepest level and delivering critical inputs into searches for new physics at the LHC and in laboratory based searches for dark matter.
    Host: Zohreh Davoudi LAST-MODIFIED:20220120T142431Z LOCATION:Zoom Link - https://umd.zoom.us/j/92661457651?pwd=RTI5OXZ4azFZRnVy RExubjlzS1l3Zz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210202T160000 DTEND;TZID=America/New_York:20210202T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20210202T160000 CREATED:20200116T204737Z DESCRIPTION:
    Meeting Recording: https://umd.hosted.panopt o.com/Panopto/Pages/Viewer.aspx?id=18837ac9-aa65-4b86-ab2e-acc4004911eb


    Time: Feb 2\, 2021 03:30 PM Eastern Time (US and Canada) \;

    Join Zoom Meeting
    https://umd.zoom.us/j/97377397525?pwd=ZjBiS1 NCa3dLTlV4MDhRUklyZU1pZz09

    Meeting ID: 973 7739 7525
    Passcode : 89593

    +13017158592\,\,97377397525# US (Washington D.C)
    +1929436 2866\,\,97377397525# US (New York)


    Speaker: Tom Hartman

    T itle: Wormholes and the Information Paradox

    Abstract:
    Black hole evaporation seems to create entropy in a way that violates quantum mechanic s. This is the essence of Hawking's black hole information paradox. I will describe recent progress on this problem\, including a new result for the e ntropy of Hawking radiation that is compatible with unitary quantum mechani cs\, and discuss the consequences for black holes in quantum gravity. The m echanism is a quantum effect in which virtual wormholes modify the leading- order behavior of highly entangled systems. This is part of a wider set of ideas relating geometry to entanglement.

    Host: Ted Jacobson LAST-MODIFIED:20220120T142431Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201208T160000 DTEND;TZID=America/New_York:20201208T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201208T160000 CREATED:20200116T204737Z DESCRIPTION:
    Meeting Recording: \;



    http s://umd.zoom.us/rec/share/EiT7h7VSMzraz1QP_MLx9tJcp1iC3iXwN_7ezTcpji0t2QfZm 6xu0B6B2DNbLm8V.wMlUhpPg56HIEtsq

    Access Passcode: a5a=9w1x


    Zoom Meeting
    https://umd.zoom.us/j/95206514449?pwd =aWFYWjlVMVdtL3BPUU4vbENKYzVhUT09

    Meeting ID: 952 0651 44 49 \;  \;Passcode: 89593 \;

    Microwave spectros copy of the positronium n = 2 fine structure: a disagreement with QEDD. B. Cassidy \;

    Department of Physics and Astronomy \, University College London\, Gower Street\, London\, WC1E 6BT\, UK.
    Since positronium (Ps) atoms are composed only of leptons they are\, for all practical purposes\, pure QED systems\, unaffected by nuclear struc ture effects. Also\, being composed of a particle-­‐antiparticle pair\, Ps atoms are metastable\, and may decay via self-­‐annihilation a s well as through the usual radiative decay channels seen in reg ular atoms. The energy levels of Ps can be calculated to arbitrary precisio n (in principle)\, and precision spectroscopy of Ps can therefore be used t o perform rigorous tests of (bound-­‐ state) QED theory. Moreover\, since t he theoretical description is limited only by the order of the calcu lations performed\, rather than unknown physical constants or incalculabl e terms\, any observed (and confirmed) disagreement with theory could the refore indicate the existence of some sort of “new physics” such as partic les not currently included in the Standard Model [1].

    In this talk I will describe some new measurements of the Ps n = 2 fine structure\, sp ecifically 2 3S1  2 3PJ (J = 0\,1\,2) transitions [2]. The experiments we re performed by using a Surko-­‐type buffer gas positron trap [3] to produc e a dilute Ps gas with a density on the order of 106 cm-­‐3. A 5 ns pulsed dye laser was used to excite atoms to the 2 3S1 level\, and CW microwave radiation was used to drive transitions to the 2 3PJ l evels\, which decay radiatively to the ground state before annihilation [4 ]. The different annihilation decay rates of the ground and excited (S) sta tes allows the fine structure transitions to be monitored via the time spec trum of the Ps annihilation radiation [2].

    We found that the measure d J = 1 and J = 2 lineshapes exhibited significant asymmetries\, whereas a symmetric lineshape was observed for the J = 0 transition. The observed asy mmetries are not consistent with the most obvious quantum interference phen omena arising from the presence of nearby (off-­‐resonant) transiti ons [5]\, and in the absence of a complete lineshape model we are theref ore unable to determine the fine structure intervals for these transitions. Since the J = 0 lineshape did not exhibit any significant asymmetry it was possible to extract a value for the centre frequency: however\, the obtain ed interval was found to disagree with theory by 2.77 MHz\, which amounts t o 4.5 standard deviations. No mechanism for a line shift of this magnitude has so far been identified.

    [1]Current and future perspectives of po sitronium and muonium spectroscopy as dark sectors probe\, Claudia Frugiuel e\, Jesús Pérez-­‐Ríos\, and Clara Peset\, Phys. Rev. D 100\, 015010 (2019) .

    [2]Precision Microwave Spectroscopy of the Positronium n=2 Fine St ructure\, L. Gurung\, T. J. Babij\, S. D. Hogan\, and D. B. Cassidy\, Phys. Rev. Lett. 125\, 073002 (2020).

    [3]Plasma and trap-­‐based techn iques for science with positrons\, J. R. Danielson\, D. H. E. Dubin \,
    R. G. Greaves\, and C. M. Surko\, Rev. Mod. Phys. 87\, 247 (2015).

    [4]Production of 23S1 positronium atoms by single-­‐photon exci tation in an electric field\, A. M. Alonso\, S. D. Hogan\, and D. B. Cassidy\, Phys. Rev. A 95\, 033408 (2017).

    [5]The Effect of Quantum- ­‐Mechanical Interference on Precise Measurements of the n = 2 Triplet P Fi ne Structure of Helium\, A. Marsman\, M. Horbatsch\, and E. A. Hessels\, Jo urnal of Physical and Chemical Reference Data 44\, 031207 (2015).

    Host: Charles Clark LAST-MODIFIED:20220120T142431Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201201T160000 DTEND;TZID=America/New_York:20201201T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201201T160000 CREATED:20200116T204737Z DESCRIPTION:

    Zoom Meeting: \; \;
    https://umd.zoom.u s/j/97904505754?pwd=L2VJYjVVWUN2QVJrOUR0SjVuUFJHdz09

    Meeting ID: 979 0450 5754 Passcode: 89593 \;

    Speaker: Austin Waters and Ris to Miikkulainen\, University of Texas\, Austin

    Abstract: \; GRAD E is a statistical machine learning system developed to support the work of the graduate admissions committee at the University of Texas at Austin Dep artmentof Computer Science (UTCS). In recent years\, the number of applicat ions to the UTCS PhD program has become too large to manage with a traditio nal review process. GRADE uses historical admissions data to predict how li kely the committee is to admit each new applicant. It reports each predicti on as a score similar to those used by human reviewers\, and accompanies ea ch by an explanation of what applicant features most influenced its predict ion. GRADE makes the review process more efficient by enabling reviewers to spend most of their time on applicants near the decision boundary and by f ocusing their attention on parts of each applicant’s file that matter the m ost. An evaluation over two seasons of PhD admissions indicates that the sy stem leads to dramatic time savings\, reducing the total time spent on revi ews by at least 74%. \; Link to the published paper: \;https://doi.org/10.1609/aimag.v35i1. 2504 \;

    Host: Victor Yakovenko \; LAST-MODIFIED:20220120T142431Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201117T153000 DTEND;TZID=America/New_York:20201117T180000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201117T160000 CREATED:20200116T204737Z DESCRIPTION:IPST Shih-I Pai Lecture\n\nAlan Aspuru-Guzik\, University of To ronto\n\nRegister for the Lecture: https://umd.alumniq.com/index.cfm/events :register/home/eventId/1131\n\n\n3:30 - 4:30 p.m.\nVirtual Lecture by Alán Aspuru-Guzik\, “Where Computational Science Meets Experiment:  Self-Driving Laboratories for Materials Discovery”  \n\n4:30 - 5:00 p.m.\nSpeaker Quest ion and Answer Session with Panelist LAST-MODIFIED:20220120T142431Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201110T160000 DTEND;TZID=America/New_York:20201110T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201110T160000 CREATED:20200116T204737Z DESCRIPTION:
    Start Time : \;Nov 10\, 2020 03:47 PM

    Meeting Recording:
    https://umd.zoom.us/rec/share/KlQqN8E_dDqQFL8TQ38Jdkc6uD ACigWSMxyjeJhzp75nSBYLw_gtWo6kbQXCKA_0.YC8DlhhXDMARAESq

    Access Pa sscode: 43x#VjWq

    Speaker
    Professor Ellen Williams
    U niversity of Maryland

    Sc ience meets Politics: The status of clean energy innovation in Maryland&nbs p\;
     \;Zoom Meeting: \;https://umd.zoom.us/< /u>j/99744220412?pwd=bzlIM0JSSjJvOTN2c2Y1OVA3Y1Jkdz09

    Meeting ID: 997 4422 0412 \;  \;Passcode: 89593
    Host: Dr. Steve Rolston LAST-MODIFIED:20220120T142431Z LOCATION:Zoom Conference SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201103T160000 DTEND;TZID=America/New_York:20201103T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201103T160000 CREATED:20200116T204737Z DESCRIPTION:Recording Information:

    Meeting Recording:< br>https://umd.zoom.us/rec/share/hDp7HuTCdoRX7n1V6BDp6a6_3j85uTPTJvbCeivXf- 7QkC2IwZvoi8MNYYQOwrY._2essYQLtmLmw-Hq

    Access Passcode: 6?fa0 8e!


    Quantum Chaos and the Foundations of Statistical Mechanic s

    Speaker: Mark Srednicki\, UC Santa Barbara

    Abstract: Th e question of how isolated many-body systems come to thermal equilibrium ha s been debated since before the advent of quantum mechanics\, which seems o nly to confuse the issue further. I will present a simple picture\, develop ed over the last two decades\, of how thermalization of isolated quantum ma ny-body systems can occur\, with the universal properties of chaotic quantu m dynamics as the underlying mechanism. An array of analytic\, numerical\, and experimental evidence now supports the validity of this picture for a l arge class of systems.


    ZOOM link: \;http s://umd.zoom.us/j/95368896289?pwd=d0pqN3FGWjdCSFJlZDdXSmcxNlh LZz09


    Meeting ID: 953 6889 6289 \;& nbsp\;Passcode: 89593 LAST-MODIFIED:20220120T142431Z LOCATION:Zoom SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201027T160000 DTEND;TZID=America/New_York:20201027T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201027T160000 CREATED:20200116T204737Z DESCRIPTION:
    Meeting Recording:
    https://umd.zoom.us/rec/share/e2dYbaALpH7qitE9kjHEXrK fzIHKpTWOhVz01amgnZCqz3HSUQB_7LdwLYb_zSpB._CiVsDyYsRLSWS8N

    Access Passcode: P2xley4* \; \;
    Speaker: Dr. Jed Pix ley

     \;Zoom Meeting: https://umd.zoom.us/j/91028719339?pw d=MWVqT3Q0Uk0ya0V5VmlaZEp0N2VwUT09

    Meeting ID: 910 2871 9339 Pa sscode: 89593

    Twistronics in solid-state devices and beyond

    Jed H Pixley

    The ability to control and manipu late the strength of correlations in quantum matter is one of the central q uestions in condensed matter physics today. While pressure\, chemical dopin g\, or a magnetic field have served as conventional tuning knobs for a wide class of correlated systems\, the ability to twist van der Waals materials has recently emerged as a novel scheme to engineer strong correlations and tune electronic properties. In the case of twisting two sheets of graphene \, at a particular "magic-angle\,’’ the kinetic energy of electronic degree s of freedom is expected to vanish\, and as a result\, interaction effects should dominate. This has now been demonstrated experimentally following th e recent discovery of superconductivity in close proximity to correlated in sulating phases in magic-angle graphene. These results have now been reprod uced by a number of experimental groups and extended to other two-dimension al van der Waals materials.

    In this talk\, I will discuss our theory that describes the magic-angle phenomena as a universal property of Dirac p oints in an incommensurate potential. As a result\, we will discuss the gen eralization of the magic-angle effect to a wide class of models and distinc t physical settings\, such as ultra-cold atomic gases\, trapped ions\, and metamaterials. It will be shown that the magic-angle in twisted bilayer gra phene is\, in fact\, a single particle quantum phase transition that can be described by adelocalization transition in momentum space with multifracta l wave functions akin to electrons in a magnetic field and the celebrated H ofstadter's butterfly. The effects of correlations will be considered by co nstructing effective Hubbard models with dramatically enhanced interactions due to this novel quantum phase transition.

    LAST-MODIFIED:20220120T142431Z LOCATION:ZOOM Conference SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20201013T160000 DTEND;TZID=America/New_York:20201013T173000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20201013T160000 CREATED:20200116T204737Z DESCRIPTION:
    UMD users should be sure to \; log into Zoom with their UMD account. \;Guests without an @umd acco unt are welcome to participate\, but will be diverted to a waiting room and admitted by a host.

    Jesse Thaler\, MIT

    Hosted by: Ans on Hook

    Zoom Link: https://umd.zoom.us/j/98938098670?pwd=TWdSZ 0kwNlFyU2lWR2Fya251d0EyZz09

    Meeting Id: 989 3809 8670 \; Pas scode: 89593

    Collision Course: Particle Physics meets Machine Lea rning

    Modern machine learning has had an outsized impact on many scientific fields\, and particle physics is no exception. \; What is s pecial about particle physics\, though\, is the vast amount of theoretical and experimental knowledge that we already have about many problems in the field. \; In this colloquium\, I present two cases studies involving qu antum chromodynamics (QCD) at the Large Hadron Collider (LHC)\, highlightin g the fascinating interplay between theoretical principles and machine lear ning strategies. \; First\, by cataloging the space of all possible QCD measurements\, we (re)discovered technology relevant for self-driving cars . Second\, by quantifying the similarity between two LHC collisions\, we un locked a class of nonparametric machine learning techniques based on optima l transport. In addition to providing new quantitative insights into QCD\, these techniques enable new ways to visualize data from the LHC.

    MEETING RECORDING


    https://umd.zoom.us/rec/share/clp5iCCm4QVBB25M4hNaU505T72f9A82pqkHOmHSdjnfQJ0cBhK3bJaaeOtpx-yy .cBtja9SPD2Ok0sMv

    Access Passcode: q=cY394# \; \; LAST-MODIFIED:20220120T142431Z LOCATION:ZOOM SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200929T150000 DTEND;TZID=America/New_York:20200929T160000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com RECURRENCE-ID;TZID=America/New_York:20200929T160000 CREATED:20200116T204737Z DESCRIPTION:
    Gianfranco Pacchioni\, Universita' degli Studi di Milano -Bicocca

    This will begin at 3 p.m.< /i>

    Hosted by Victor Yakovenko

    Zoom Link: \;< a href="https://umd.zoom.us/j/7193062799?pwd=NHdoNitta1RkVEZKTVExZzg5V1hKdz 09">https://umd.zoom.us/j/7193062799?pwd=NHdoNitta1RkVEZKTVExZzg5V1hKdz09

    Meeting Id: 719 306 2799 \;  \;Passcode: 89593

    The Overp roduction of truth: Passion\, competition\, and integrity in modern science  \;


    The way science is done has changed radically in rec ent years. Scientific research and institutions\, which have long been char acterized by passion\, dedication and reliability\, have increasingly less capacity for more ethical pursuits\, and are pressed by hard market laws. F rom the vocation of a few\, science has become the profession of many — pos sibly too many. These trends come with consequences and risks\, such as the rise in fraud\, plagiarism\, and in particular the sheer volume of scienti fic publications\, often of little relevance. We will critically review and assess the present-day policies and behaviors in scientific production and publication. We will touch on the tumultuous growth of scientific journals \, in parallel with the growth of self-declared scientists over the world. We will investigate the loopholes and hoaxes of pretend journals and nonexi stent congresses\, so common today in the scientific arena\, and discuss pr oblems connected to the incorrect use of bibliometric indices\, which have resulted in large part from the above distortions of scientific life. The s olution? A slow approach with more emphasis on quality rather than quantity that will help us to rediscover the essential role of the responsible scie ntist.

    Reference: G. Pacchioni\, The Overproduction of truth. Passion\, competition\, and integrity in modern science\, Oxford University Press\, Oxford 2018.

    Gian franco Pacchioni received his PhD at the Freie Universität Berlin in 1984. He worked at the IBM Almaden Research Center\, and at the Technical Univers ity of Munich. He is Full Professor at the University of Milano Bicocca whe re he has been Vice Rector for Research (2013-2019) and Director of the Dep artment of Materials Science (2003-2009). He has published more than 500 pa pers (h index 85\; WoS) and given nearly 500 invited talks on the electroni c structure of oxide surfaces and interfaces\, 2D oxides\, defects\, suppor ted metal clusters\, and catalysis. He received several awards and is Fello w of the Accademia Nazionale dei Lincei (2014)\, the Academia Europaea (201 2)\, and the European Academy of Sciences (2009). He has authored some popu lar science books\, including “The overproduction of truth”\, Oxford Univer sity Press\, 2018\, where he presents a personal view of the problems of co ntemporary science.


    https ://qclab.mater.unimib.it/ LAST-MODIFIED:20220120T142431Z LOCATION:ZOOM SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200908T160000 DTEND;TZID=America/New_York:20200908T170000 RRULE:FREQ=WEEKLY;UNTIL=20210126T045959Z;BYDAY=TU EXDATE;TZID=America/New_York:20210119T160000 EXDATE;TZID=America/New_York:20210112T160000 EXDATE;TZID=America/New_York:20210105T160000 EXDATE;TZID=America/New_York:20201229T160000 EXDATE;TZID=America/New_York:20201222T160000 EXDATE;TZID=America/New_York:20201215T160000 EXDATE;TZID=America/New_York:20200922T160000 EXDATE;TZID=America/New_York:20200915T160000 EXDATE;TZID=America/New_York:20200908T160000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2@google.com CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220120T142431Z LOCATION:Physical Sciences Complex Lobby SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211116T160000 DTEND;TZID=America/New_York:20211116T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211116T160000 CREATED:20200116T204737Z DESCRIPTION:

    Irving and Renee Milchberg Endowed Lecture


    Speaker: Jim Glanz\, Ph.D.\, New York Times

    Title: The Public Relations Machine in Science: A Self -Inflicted Wound?

    Abstract: \; Scientists have legitimate reason s to worry that reporters will not cover important research\, will not accu rately portray complex findings\, or will sensationalize breakthroughs that require caveats. Unfortunately\, the P.R. apparatus that scientists create d and support has made the situation far worse. The science P.R. machine di sincentivizes the kind of ambitious reporting that receives prominence – an d therefore readers – in major publications\, and drives out talented journ alists who refuse to be herded by embargoes and other restrictions. I will discuss how by trying to promote and protect their work\, scientists have i nstead damaged science journalism and helped to erode public confidence in science itself. \; \;


    LAST-MODIFIED:20220120T142431Z LOCATION:1412 Toll Physics Bldg. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Physics Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211123T160000 DTEND;TZID=America/New_York:20211123T170000 DTSTAMP:20220808T214455Z UID:4qr2q1ugtmb51ess9nagbn98j2_R20210126T210000@google.com RECURRENCE-ID;TZID=America/New_York:20211123T160000 CREATED:20200116T204737Z DESCRIPTION: LAST-MODIFIED:20220120T142431Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:No Physics Colloquium today TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220126T160000Z DTEND:20220126T171500Z DTSTAMP:20220808T214455Z UID:68r7avf7cga99pv8q5u9th9rs2@google.com CREATED:20220120T141014Z DESCRIPTION:Speaker: Meenal Jain Literature Seminar\n\nTitle: TBA LAST-MODIFIED:20220120T141014Z LOCATION:IPST Bldg. #085\, 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220125T180000Z DTEND:20220125T190000Z DTSTAMP:20220808T214455Z UID:4346c88klrsqsuaiacjiosrg3q@google.com CREATED:20220120T140617Z DESCRIPTION: LAST-MODIFIED:20220120T140641Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220126T170000Z DTEND:20220126T180000Z DTSTAMP:20220808T214455Z UID:5vd7s5v4qamd3b058dmf2ikg70@google.com CREATED:20220120T140459Z DESCRIPTION:Speaker: Johnpierre Paglione\, Director\, Maryland Quantum Mate rials Center

    Title: Topological Superconductivity in Nearly Ferromag netic \;UTe2


    Abstract: Top ological superconductivity has attracted great interest in condensed matter physics because of its potential applications in quantum computing. Spin-t riplet superconductors are one promising class that can host the topologica l excitations of interest\, but experimental realizations are few and far b etween. Here we report the discovery and properties of superconductivity in UTe2\, a material closely related to known ferromagnetic superc onductors such as UGe2\, URhGe\, and UCoGe\, but lacking long-ra nge magnetic order. Several experimentally measured properties feature tell tale indications of an unconventional energy gap and a spin-triplet pairing state that is consistent with the presence of strong magnetic fluctuations due to an incipient quantum critical point. Furthermore\, the superconduct ivity in UTe2 \;is remarkably robust to extremely high magne tic fields\, showing re-entrant pairing up to at least 65 Tesla. \; I w ill review basic properties and our detailed investigations of the gap stru cture\, relation to incipient magnetic order and Kondo coherence\, as well as indications of an anomalous normal state fluid that suggest many surpris es await for this exotic material.

    Bio:

    Johnpierre Paglione has see ded a world-class effort on quantum materials research at UMD\, leading the collaborations of several faculty that have brought Maryland to the forefr ont of research on superconductivity\, topological materials and strongly c orrelated systems. Having contributed to several fields of experimental con densed matter research through both single-crystal synthesis and ultra-low temperature transport\, thermodynamic and spectroscopic exploration of nove l phenomena\, Paglione’s research is a blend of materials exploration and e lucidation of quantum phenomena. As Director of the \;Maryland Quan tum Materials Center\, with a membership of over 100 personnel\, a sta te-of-the-art materials synthesis facility and an extensive measurement sui te\, Paglione commits QMC resources to hosting the annual Fundamentals of Q uantum Materials Winter School\, a successful hands-on training program and basis for this work. Paglione is the recipient of a National Science Found ation CAREER Award and an Early Career Award from the Department of Energy\ , is a Materials Synthesis Fellow in the EPiQS program of the Gordon and Be tty Moore Foundation and a Fellow of the Quantum Materials Program of the C anadian Institute for Advanced Research. Dr. Paglione earned his PhD from t he University of Toronto in Canada.

    LAST-MODIFIED:20220120T140459Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220202T160000Z DTEND:20220202T170000Z DTSTAMP:20220808T214455Z UID:1ca4gt83lcght6aomof6b1nq82@google.com CREATED:20220112T013442Z DESCRIPTION:Title: Fault Tolerance and Holography\nSpeaker: Ning Bao (Bro okhaven National Laboratory)\nTime: Wednesday\, February 2\, 2022 - 11:00a m\nLocation: ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/4111099 146 Meeting ID: 411 109 9146\n\nIn this talk I will study the extension of fault tolerance techniques to holographic quantum error correcting codes in the context of the ads/cft correspondence. I will seek to argue that the t hreshold here corresponds to that of the confinement/de confinement phase t ransition here\, analogously to the situation in topological quantum error correcting codes based on Tqft’s.\n\nJoin Zoom Meeting\nhttps://umd.zoom.us /j/4111099146\nMeeting ID: 411 109 9146\nOne tap mobile\n+13017158592\,\,41 11099146# US (Washington DC)\n+13126266799\,\,4111099146# US (Chicago)\nDia l by your location\n +1 301 715 8592 US (Washington DC)\n +1 312 626 6799 US (Chicago)\n +1 929 436 2866 US (New York)\n + 1 253 215 8782 US (Tacoma)\n +1 346 248 7799 US (Houston)\n + 1 669 900 6833 US (San Jose)\nMeeting ID: 411 109 9146\nFind your local num ber: https://umd.zoom.us/u/abk5ky5DyW\nJoin by SIP\n4111099146@zoomcrc.com\ nJoin by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114.1 31.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amste rdam Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Syd ney)\n103.122.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\n64. 211.144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toront o)\n65.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.13 7.24.110 (Japan Osaka)\nMeeting ID: 411 109 9146 LAST-MODIFIED:20220112T013442Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/4111099146 M eeting ID: 411 109 9146 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Ning Bao TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20220207T213000Z DTEND:20220207T223000Z DTSTAMP:20220808T214455Z UID:62056b3lij02jivcvcfs9tsa1d@google.com CREATED:20220107T210514Z DESCRIPTION:Title: Cosmic Explosions and Cosmic Accelerators

    Speaker : Regina Caputo\, NASA Goddard Space Flight Center

    Abstract: The sum mer of 2017 ushered in the era of multimessenger astrophysics and the Fermi Gamma-ray Space Telescope has be en at the forefront. We can now observe the universe not only with light an d cosmic rays\, but also with gravitational waves and neutrinos. When two s tars made of the densest material in the universe smashed together\, Fermi observed a burst of gamma rays. At the same time\, the gravitational wave f rom this explosion was observed with the Las er Interferometer Gravitational-wave Observatory (LIGO)\, setting off a campaign by nearly every telescope in the world to observe the result of t he cataclysm. Within a month of this discovery\, Fermi also observed a dist ant galaxy accelerating particles to extreme energies resulting in more gam ma rays than it had ever produced before. During this time\, the IceCube South Pole N eutrino Observatory detected a high energy neutrino telling us about th e fundamental components of the accelerated cosmic rays. Observing multiple messengers from the same source revolutionized our understanding of the ex treme universe. The next decade will be one of multimessenger discovery.

    Notes: Join the meeting at 4:15 for meet and greet LAST-MODIFIED:20220107T211016Z LOCATION:Online via Zoom\, visit https://bit.ly/2PmJoT6 for access SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211213T200000Z DTEND:20211213T213000Z DTSTAMP:20220808T214455Z UID:27c8qqqqg1ti0qnce3l80hgm5c@google.com CREATED:20210827T185952Z DESCRIPTION:Speaker: Keith Dienes\, University of Arizona/ NSF


    T itle: "UV/IR Mixing\, EFTs\, and Origami: Calculating the Higgs Mass in Str ing Theory"

    Abstract
    In this talk\, we shall present a non-techni cal method of understanding UV/IR mixing from a field-theoretic perspective . We will then discuss how these ideas are ultimately realized in string th eory\, providing a self-contained introduction to relevant string ideas as we proceed. Finally\, we shall present a fully string-theoretic framework f or calculating one-loop Higgs masses directly from first principles in pert urbative closed string theories. Notably\, using our framework\, we find th at a gravitational modular anomaly generically relates the Higgs mass to th e one-loop cosmological constant\, thereby yielding a string-theoretic conn ection between the two fundamental quantities which are known to suffer fro m hierarchy problems in the absence of spacetime supersymmetry. We also dis cuss a number of crucial issues involving the use and interpretation of reg ulators in UV/IR-mixed theories such as string theory\, and the manner in w hich one can extract an EFT description from such theories. Finally\, we an alyze the running of the Higgs mass within such an EFT description\, and un cover the existence of a ``dual IR'' region which emerges at high energies as the consequence of an intriguing scale-inversion duality symmetry. We al so identify a generic stringy effective potential for the Higgs fields in s uch theories. Our results can therefore serve as the launching point for a rigorous investigation of gauge hierarchy problems in string theory.

    Slides LAST-MODIFIED:20211216T183032Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211216T210000Z DTEND:20211216T220000Z DTSTAMP:20220808T214455Z UID:17dot1r7ap86embleskfhg1j83@google.com CREATED:20211214T150500Z DESCRIPTION:Speaker: Dr. Kostyantyn Kechedzhi


    T itle: Many-body Physics with NISQ superconducting processors

    Abstract: Recent demonstration of the first beyond classical quantum computation with a programmable superconducting quantum processor [1] open s the path to discovery of new quantum physics phenomena using these hardwa re systems. Gate model quantum computers used in [1] realize complex multi- qubit evolution in terms of discrete gates\, elementary one and two qubit u nitary operations\, practically realized by a local time-dependent control Hamiltonian. In this talk we overview the recent many-body physics experime nts implemented on these processors. We will specifically focus on the theo ry and experimental data describing quantum circuit kinetics in such system s\, which answers the following question: how does a system initialized in a product state generate highly entangled states and in the case of a non-i ntegrable system approach universal random matrix statistics? We characteri ze circuit kinetics using time-dependent evolution of out-of-time-order cor relators (OTOC) and their ensemble variance. We demonstrate that dynamics o f an ensemble average OTOC can be mapped onto a classical dynamical process akin to a population dynamics in biology. OTOC variance on the other hand is subject to a “sign problem” and therefore evades efficient classical des cription. We use ensemble average OTOC to verify hardware output\, whereas OTOC variance provides a signature of operator entanglement generated in th e system [2].


    [1] Arute et. al. Nature\, Vol 574\, 505 (2019)

    [2] Mi et. al. Science 2021 (10.1126/science.abg5029) arXiv:2101.08870

    Please contact Eri ka Martin (emartin3@umd.edu) for any questions. LAST-MODIFIED:20211214T150500Z LOCATION:ATL4402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211203T183000Z DTEND:20211203T193000Z DTSTAMP:20220808T214455Z UID:0ucbo9depb3rkhj2ogscflo7nn@google.com CREATED:20210816T143902Z DESCRIPTION:**Joint Cornell/ UMD Seminar**

    Speaker: David E. Kaplan\, Johns Hopkins University

    Preceded by virtual lunch at 12:30 pm.

    Title: A Causal Modification of Quantum Mechanics

    Abstrac t: We present a modification of quantum mechanics in which a specific class of state-dependent term is added to the Schroedinger Equation. We show th at this term produces non-trivial effects which amount to the ‘wave functio n talking to itself’. We show that these effects are nevertheless causal ( don’t violate relativity) while having profound experimental consequences. We also show that this modification has a simple embedding in local quantu m field theory. While the physical effects are dramatic\, they are also fi ckle\, in that their strength depends on the cosmological history of the wa ve function of the universe. We will present proposals for laboratory (e.g .\, AMO)\, astrophysical\, and cosmological tests that could be done to dis cover such an effect.?

    Seminar Slides LAST-MODIFIED:20211209T181914Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint Cornell/ UMD Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211214T143000Z DTEND:20211214T153000Z DTSTAMP:20220808T214455Z UID:0pvab412ehh7rd9fvomtqgqdne@google.com CREATED:20211209T142627Z DESCRIPTION:Speaker: Robert Ott\, Heidelberg\n\nTitle: Quantum simulation o f high energy physics\n\nAbstract: Quantum simulation offers the exciting p rospect of investigating quantum field theories with table-top experiments. This allows us to explore phenomena which are hard to access with classica l computation techniques. As an example\, we quantum simulate a one dimensi onal (quantum link) lattice gauge theory both close to and far away from eq uilibrium. Starting from highly excited initial states\, we experimentally follow the dynamics to late times and observe relaxation towards an equilib rium state in agreement with a thermal ensemble.\nI will then describe a sc heme which exploits the spin-changing collisions of ultra-cold atoms to ext end quantum simulations of gauge theories to two dimensions. I will demonst rate how such a quantum simulator would give rise to complex non-equilibriu m evolution as well as charge confinement in a lattice gauge theory.\nAt la st\, I will address the quantum effective action for the far-from-equilibri um evolution of a scalar quantum system\, the possibility of extracting sel f-similar effective interactions from correlation measurements\, and possib le future applications to gauge theory quantum simulations.\n\nSeminar will also be streamed live via zoom: https://umd.zoom.us/j/98955643205?pwd=Rmov U0pjYnZ3ZDQvUSs5c2RhSG1WZz09 LAST-MODIFIED:20211209T142627Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211216T160000Z DTEND:20211216T173000Z DTSTAMP:20220808T214455Z UID:77r70lc0ibhh9k6enku000gr6m@google.com CREATED:20211207T191550Z DESCRIPTION:Title:  A Platform for Cavity Quantum Electrodynamics with R ydberg Atom Arrays

    Speaker: Yu-Ting Chen\, M.I.T.

    Time/Da te:  11:00 am\, Thursday Dec. 16th

    Location: PSC 2136 
    Virtual lo cation:  https: //umd.zoom.us/j/99534083844

    Abstract:
    In cavity quantu m electrodynamics (cavity QED) systems\, the realization of strong coupling between light and atoms plays a critical role in studying quantum optics a nd entanglement.  At the same time\, the Rydberg atom arrays provide a prom ising platform for exploring many-body physics. However\, with the Rydberg- mediated interactions\, the atoms mainly interact with each other locally. Combining the cavity QED and Rydberg arrays systems opens up new research d irections in many-body physics with long-range interactions\, creating a fu lly connected quantum network. Here\, we introduce a new high-finesse cavit y QED setup designed for Rydberg arrays. The setup has a state-of-the-art s ingle-atom cooperativity and will allow more than 50 atoms in the array.  I n addition\, this platform enables the creation of the Rydberg superatom\, an ensemble of atoms acting as a two-level system. Combining the superatoms with the high-finesse cavity\, we expect to increase the single-atom coope rativity by 2 or 3 orders of magnitude. I will present the progress toward realizing strong coupling using this setup. I will also discuss the potenti al applications of studying long-range spin physics.

    Host: Trey Port o LAST-MODIFIED:20211207T191550Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211216T160000Z DTEND:20211216T170000Z DTSTAMP:20220808T214455Z UID:04l4f546ngnjdlbi7b0o6huqql@google.com CREATED:20211206T172635Z DESCRIPTION:Location: ATL4402

    Speaker: Ryan Barnett (Imperial Colleg e London)

    Title: Polarons and Topological Effects in Ultracold Atomi c Gases

    Abstract: Ultracold atomic gases have proven to provide valu able platforms to simulate quantum systems arising in disparate areas of ph ysics. Polarons are well-studied quasiparticles in solid-state systems that describe an electron dressed by lattice distortions. The so-called Frohlic h model is the typical starting point for theoretically describing such sys tems. More recently\, polarons arising in Bose-Einstein condensates have be en the focus of much attention\, both theoretical and experimental. For suc h systems\, the Bogoliubov phonons play the role of the lattice vibrations of a solid. Furthermore\, by using a Feshbach resonance the strong and weak coupling regimes are readily accessed in experiments. In this talk\, I wil l describe a recent framework developed to understand Bose-polarons in ultr acold atomic gases. This framework incorporates the back action of the impu rity on the BEC at the mean field level and forms a natural starting point for incorporating quantum fluctuations. Time permitting\, I also hope to di scuss separate but related work describing topological band systems which c an arise in ultracold atomic gases. In particular\, I will discuss so-calle d local topological markers which can naturally be used to characterise top ological band systems that do not have translational invariance.

    Phys. Rev. Research 2\, 033142 (2020)

    arXiv:2111.07957< u>

    Phys. Rev. B 103\, 155134 (2021)

    For any question s email: em artin3@umd.edu

    LAST-MODIFIED:20211206T172635Z LOCATION:ATL 4402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211210T180000Z DTEND:20211210T224500Z DTSTAMP:20220808T214455Z UID:50t8vhcanmlh15unamdovia2qk@google.com CREATED:20211203T150928Z DESCRIPTION:Speaker Name: Multiple speakers from various institutions
    Sp eaker Institution : UMD - Astronomy\, UMD - Physics\, GSFC\, GMU/NRL

    Title : Minisymposium on Neutron Stars and NICER

    Schedule
    1:00-2 :00 PM Lunch outside conference room (ATL 2400)
    2:00-2:15 PM Setup and i ntroduction
    2:15-2:45 PM Paulo Bedaque (UMd physics): the nuclear physic s of dense matter
    2:45-3:15 PM Megan DeCesar (GMU/NRL): high pulsar mass es from radio timing
    3:15-3:45 PM Zorawar Wadiasingh (GSFC): neutron sta r EOS from gravitational waves and multimessenger observations
    3:45-4:15 PM Break
    4:15-4:45 PM Alex Dittmann (UMd astro): inference of neutron s tar radii using NICER observations
    4:45-5:15 PM Cecilia Chirenti (UMd/GS FC): future constraints from gravitational waves
    5:15-5:45 PM General di scussion


    Notes: Lunch will be provided outside of 2400 ATL begin ning at 1:00 p.m. Presentations will begin at approximately 2:00-2:15. Plea se wear a mask if you are in attendance\, but presenters may speak without a mask if they are at least 6 ft. from the audience.

    Contact Name: J ohn Cullinan
    Contact E-Mail: \;jcu llina@umd.edu LAST-MODIFIED:20211203T150928Z LOCATION:Room: ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Space-Science Institute TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211209T160000Z DTEND:20211209T170000Z DTSTAMP:20220808T214455Z UID:7ukdipgmfpgp48gp5o8iqec3hr@google.com CREATED:20211117T152419Z DESCRIPTION:Speaker: Cole Miller\, UMD\n\nTitle: Learning about dense matte r from astronomical observations\n\nAbstract: In the last decade\, a series of astronomical measurements has provided outstanding new insight into the properties of the dense\, cold matter in the cores of neutron stars. Thes e include precise measurements of the masses of three ~2 Msun neutron stars \, tidal deformability constraints from the gravitational wave event GW1708 17\, and measurements of the radii of two neutron stars using data from NAS A's NICER satellite. I will discuss these measurements\, and will focus in particular on our group's work on NICER pulsars. I will also discuss the implications of our results for the properties of the dense matter in the c ores of neutron stars. LAST-MODIFIED:20211202T181950Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211208T193000Z DTEND:20211208T203000Z DTSTAMP:20220808T214455Z UID:6eoj8ejs2oprrc06k8h0l1kcie@google.com CREATED:20211202T152246Z DESCRIPTION:Speaker Name: Alexis Marret

    Speaker Institution : Sorbon ne/Paris Observatory

    Title : The non-resonant streaming instability: from theory to experiments

    Abstract : on the kinetic energy of the particles collective streaming motion. Of the different streaming instabili ties\, the non-resonant mode has received growing attention as it can ampli fy the magnetic field well beyond its initial intensity\, and generate the necessary turbulence to help confine and accelerate cosmic rays in supernov ae remnants and young stellar jets shocks. In general\, it can develop in a large variety of environments\, ranging from the cold and dense molecular clouds to the hot and diffuse intergalactic medium.

    This work aims a t elucidating the behaviour of the non-resonant cosmic rays streaming insta bility in such environments\, where thermal and collisional effects can sub stantially modify its growth and saturation. To study the instability in ho t environments\, where finite Larmor radius effects are important\, we reso rt to linear kinetic theory and extend the existing analytical results to t he case of decoupled ions and magnetic perturbations. We find that the unst able wavelengths are not entirely suppressed\, but are instead shifted towa rd larger scales with a strongly reduced growth rate.

    The linear the ory results are confirmed and extended to the non-linear evolution by using multi-dimensional hybrid-Particle-In-Cell simulations (kinetic ions and fl uid electrons). The simulations highlight an important reduction of the lev el of magnetic field amplification in the hot regime\, indicating that it m ay be limited in hot astrophysical plasmas such as in superbubbles or the i ntergalactic medium. In colder and denser environments\, such as H II regio ns and molecular clouds\, particle collisions in the background plasma must be taken into account. We investigate numerically their impact by includin g Monte-Carlo Coulomb and neutral collisions in the simulations. We find th at the instability is rapidly suppressed in poorly ionized plasmas. In cont rast\, we find that in fully ionized plasmas\, Coulomb collisions unexpecte dly favour the development of the instability by reducing self-generated pr essure anisotropies that would otherwise oppose its growth.

    Numerica l simulations are currently the only means to investigate the non-linear ev olution of the instability and to obtain quantitative estimates of the satu rated magnetic field intensity. The final part of this work is devoted to a nswer the growing need for an experimental verification of the linear theor y and simulations predictions. We describe some of the requirements on the plasma parameters to generate the instability in an experiment\, and propos e two preliminary setups based on existing high-power laser facilities\, ai ming at observing and characterizing the non-resonant mode for the first ti me in the laboratory.

    Name: Marc Swisdak
    E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20211202T152246Z LOCATION:Contact swisdak@umd.edu for the Zoom address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211210T180000Z DTEND:20211210T190000Z DTSTAMP:20220808T214455Z UID:1qb844thd5e4j1qb4dgn4g30q6@google.com CREATED:20210914T151514Z DESCRIPTION:Speaker: Nandita Abhyankar\, Assistant Research Scientist\, UMD \, IREAP/NIST

    Title: Electron Spin Resonance Spectroscopy for Micro-Structural Analysis of Sub-Nanoliter Volume Samples

    Ab stract: \;https://mse.umd.edu/event/16534/mse-seminar-series-ele ctron-spin-resonance-spectroscopy-for-micro-structural-analysis LAST-MODIFIED:20211202T142943Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211202T160000Z DTEND:20211202T173000Z DTSTAMP:20220808T214455Z UID:3a9mqlppo4ug0e3u3um8qa1mqs@google.com CREATED:20210901T143443Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoom.u s/j/99485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    social hour at 11:20am with the seminar at 11:30am

    Speaker: Ermal Rapaj\, Berke ley

    Title: "Entanglement and correlations in collective multi-angle neutrino flavor evolution"


    Abstract:
    In astrophysical scenari os with large neutrino density\, like supernovae\, compact object binary me rgers\,
    and the early universe\, the presence of neutrino-neutrino inter actions can give rise to collective flavor oscillations
    in the out-of-eq uilibrium collective dynamics of a neutrino cloud. These oscillations are c ritical to determine the neutrino flavor content\,
    which has striking im pacts on core-collapse supernovae or compact binary merger remnants.
    Lar ge neutrino fluxes emitted from the proto-neutron star\, in the case of sup ernovae\,
    or from the hyper-massive neutron star remnant\, in the case o f mergers\,
    not only provide heating and cooling mechanisms on the eject a\,
    but also alter the nucleosynthesis by determining the neutron-to-pro ton ratio.
    Additionally\, the flavor ratio is a key observable for the n ext Galactic supernova event.
    It is a challenging many-body problem that so far has been mainly studied at the mean-field approximation.
    It has been argued in the past that simple models of the neutrino Hamiltonian desi gned to describe forward scattering
    can support substantial flavor evolu tion on very short time scales.
    In this work\, we combine tensor network methods and other recent developments in
    studying flavor evolution for large particle systems and find interesting links between dynamic developme nt of entanglement and correlations
    and collective phenomena. \;&nbs p\; LAST-MODIFIED:20211202T142814Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211206T200000Z DTEND:20211206T213000Z DTSTAMP:20220808T214455Z UID:7353tq3920kfm7m58qclnujll9@google.com CREATED:20210902T171427Z DESCRIPTION:Speaker: Hongwan Liu\, NYU/IAS \n\nTitle: Dark photons and the cosmic radiation background\n\nAbstract: \n\n\n\nThe dark photon is a well- motivated extension of the Standard Model which can mix with the regular ph oton. This mixing is enhanced whenever the dark photon mass matches the pri mordial plasma frequency\, leading to resonant conversions between photons and dark photons. These conversions can produce observable cosmological sig natures\, including distortions to the cosmic radiation background. In this talk\, I will discuss a new analytic formalism for these conversions that can account for the inhomogeneous distribution of matter in our universe\, leading to new and revised limits on the mixing parameter of light dark pho tons derived from the COBE/FIRAS measurement of the cosmic microwave backgr ound spectrum. I will then describe some ongoing work on a dark sector mode l that can explain the longstanding ARCADE radio background excess through resonant conversions of dark photons. LAST-MODIFIED:20211201T211744Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211208T160000Z DTEND:20211208T171500Z DTSTAMP:20220808T214455Z UID:0j6i2vblrg14dd1h7iohsof0lv@google.com CREATED:20210914T160431Z DESCRIPTION:Speaker: Peng Chen\, Cornell University - \;http://chen.chem.cornell.edu/pengchen .html

    Title: Single-Molecule Catalysis: Nanoparticles and Polyme rs

    Abstract: This presentation will describe our efforts in developi ngand applying single-molecule approaches to study (photo)(electro)catalysi s onnanoparticles and in making polymers. In the first part\, I will give s omebackground on single-molecule\, super-resolution fluorescence imaging of catalytic reactions on single nanoparticle\, with some examples\, as well a s presentour recent work of imaging nonfluorescent surface processes at sup er opticalresolution. In the second part\, I will describe our work inusing magnetic tweezers to track single polymer growth in real time underliving polymerization catalysis conditions.

    Key references:

    1)  \; \; \; \; \;X.Mao\, C. Liu\, M. Hesari\, N. Zou\, P. Chen * "Super-resolu tion imaging ofnonfluorescent reactions via competition" Nature Chem . 2019\, 11\, 687-694.

    2) \; \; \;  \; \;R. Ye\, M. Zhao\, X. Mao\, Z. Wang\, D. A. Garzon\,H. Pu\, Z. Zhao \, P. Chen* "N anoscale cooperativeadsorption for materials control" Nature Commun . 2021\, 12\, 4287.

    3) \; \;&n bsp\; \; \;C. Liu\, K. Kubo\, E. Wang\, K.-S. Han\, F. Yang\, G.Che n\, F. A. Escobedo\,* G. W. Coates\,* P. Chen* "Single polymergrowth dynamics" S cience 2017\, 358\, 352-355.

    4) \;  \; \; \; \;S. Baral\, C. Liu\, U. K. Chakraborty\, K. Kubo \, X.Mao\, G. W. Coates\, P. Chen* "Single-chain polymerizationdynamics and conformational mech anics of conjugated polymers" Chem 2021\, 7\, 2175-2189.

     \;

    LAST-MODIFIED:20211201T165019Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211210T170000Z DTEND:20211210T174500Z DTSTAMP:20220808T214455Z UID:7cq7nspso24rfn53of1995512q@google.com CREATED:20211130T232239Z DESCRIPTION:Title: Shadow process tomography of quantum channels\nSpeaker: Jonathan Kunjummen (QuICS)\nTime: Friday\, December 10\, 2021 - 12:00pm\ nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/9948411920 7\n\nQuantum process tomography is a critical capability for building quant um computers\, enabling quantum networks\, and understanding quantum sensor s. Like quantum state tomography\, the process tomography of an arbitrary q uantum channel requires a number of measurements that scale exponentially i n the number of quantum bits affected. However\, the recent field of shadow tomography\, applied to quantum states\, has demonstrated the ability to e xtract key information about a state with only polynomially many measuremen ts. In this talk\, I will explain how we apply the concepts of shadow state tomography to the challenge of characterizing quantum processes. We make u se of the Choi isomorphism to directly apply rigorous bounds from shadow st ate tomography to shadow process tomography\, and we find additional bounds on the number of measurements that are unique to process tomography. Our r esults\, which include algorithms for implementing shadow process tomograph y\, enable new techniques including evaluation of channel concatenation and the application of channels to shadows of quantum states. Reference: arXi v:2110.03629\n\nPizza and drinks served after the talk. Note: This will be the last Friday Quantum Seminar of the semester. LAST-MODIFIED:20211130T232239Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Jonathan Kunjummen TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211208T203000Z DTEND:20211208T220000Z DTSTAMP:20220808T214455Z UID:0i6g7b6jgv45i2pdfvkul3sjbt@google.com CREATED:20211130T222957Z DESCRIPTION:
    Abstract:
    Nonlinear superconducting traveling wave devic es are a promising platform for broadband manipulation of single photon lev el microwave signals. For example\, Josephson traveling wave parametric amp lifiers (JTWPAs) are widely used for qubit readout in the cQED community\; however\, despite multiple independent implementations\, their quantum effi ciency remains ~20% below that of an ideal two-mode parametric amplifier. T his raises the question: does broadband amplification come at the cost of r educed quantum efficiency? I discuss\, and describe experimental progress t owards realizing\, our finding that although standard JTWPAs face this trad e-off\, it can be circumvented in a new type of amplifier we call a "Floque t mode amplifier"\, which can achieve near ideal quantum efficiency over a large instantaneous bandwidth. Next I will summarize our proposed traveling wave scheme for broadband microwave isolation using parametric mode conver sion in conjunction with adiabatic phase matching in a pair of coupled nonl inear transmission lines\, for which numerical simulations show more than 2 0 dB isolation over an octave band (4-8 GHz) in a 2000 unit cell device.

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    LAST-MODIFIED:20211130T222957Z LOCATION:WebEx: https://lpscp.webex.com/lpscp/j.php?MTID=m28143635cb92b5e06 c99f06274680f73 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar: Approaching the quantum limits for amplification and i solation with nonlinear metamaterials\, Prof. Kevin O'Brien\, MIT TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211217T160000Z DTEND:20211217T170000Z DTSTAMP:20220808T214455Z UID:7k82hd3o4lfdksl872b5a96rjj@google.com CREATED:20211130T161100Z DESCRIPTION:Location: ATL4402

    Speaker: Andy Lucas (University of Col orado Boulder)

    Title: Fingerprints of quantum criticality in locally resolved transport

    Abstract: New experimental methods such as nitro gen vacancy center magnetometry allow for the imaging of local transport ph enomena well below the micron length scale. I will describe how these meth ods might be used to experimentally reveal quantum critical dynamics which is invisible in conventional bulk transport measurements. Using a holograp hic system as a toy model\, I will describe what happens as current is push ed through a geometric constriction in both hydrodynamic and quantum critic al transport regimes\, both in charge neutral and non-zero density limits. Remarkably\, our model does seem to quantitatively capture locally imaged transport in charge neutral graphene at high temperatures\, albeit in a la rgely ohmic transport regime with only weak “quantum critical” corrections.

    For any questions email: emartin3 @umd.edu LAST-MODIFIED:20211130T161414Z LOCATION:ATL4402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211201T203000Z DTEND:20211201T213000Z DTSTAMP:20220808T214455Z UID:6uatghhgj1dk1dr8i7eorm24h7@google.com CREATED:20211129T140603Z DESCRIPTION:Speaker Name: Jason TenBarge
    Speaker Institution : PPPL
    < br>Title : Particle Energization in Perpendicular and Oblique Shocks and Re lated Instabilities

    Abstract : Collisionless shocks play an importan t role in space and astrophysical plasmas by irreversibly converting the en ergy of the incoming supersonic plasma flows into other forms. We leverage the pristine phase space representation made possible by direct discretizat ion of the Vlasov-Maxwell system within the Gkeyll framework to directly di agnose the exchange of energy between fields and particles in perpendicular and oblique shocks. We identify the phase space signatures of shock drift acceleration and adiabatic heating. Additionally\, we examine the electron cyclotron drift instability (ECDI)\, which is often observed in the foot an d ramp of heliospheric shocks and plays an important role in heating electr ons and ions\, as well as supplying anomalous resistivity. Motivated by the non-Maxwellian particle distributions observed in heliospheric shocks\, we present preliminary results concerning the modification of the ECDI initia lized with a kappa electron distribution compared to traditional prediction s derived under Maxwellian assumptions.

    Host Name: Marc Swisdak
    H ost E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20211129T140603Z LOCATION:Contact swisdak@umd.edu for Zoom address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211201T203000Z DTEND:20211201T213000Z DTSTAMP:20220808T214455Z UID:29mrd446n7f684nekn6tv30g24@google.com CREATED:20211129T133459Z DESCRIPTION:Title : Particle Energization in Perpendicular and Oblique Shoc ks and Related Instabilities

    Speaker Name: Jason TenBarge

    Speaker Institution : PPPL

    Notes: Contact swisdak@umd.edu for Zoom address.

    Abstract : Collisionl ess shocks play an important role in space and astrophysical plasmas by irr eversibly converting the energy of the incoming supersonic plasma flows int o other forms. We leverage the pristine phase space representation made pos sible by direct discretization of the Vlasov-Maxwell system within the Gkey ll framework to directly diagnose the exchange of energy between fields and particles in perpendicular and oblique shocks. We identify the phase space signatures of shock drift acceleration and adiabatic heating. Additionally \, we examine the electron cyclotron drift instability (ECDI)\, which is of ten observed in the foot and ramp of heliospheric shocks and plays an impor tant role in heating electrons and ions\, as well as supplying anomalous re sistivity. Motivated by the non-Maxwellian particle distributions observed in heliospheric shocks\, we present preliminary results concerning the modi fication of the ECDI initialized with a kappa electron distribution compare d to traditional predictions derived under Maxwellian assumptions. LAST-MODIFIED:20211129T133533Z LOCATION:online SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Plasma Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211202T190000Z DTEND:20211202T200000Z DTSTAMP:20220808T214455Z UID:2das8cmhl99aaa0q9e51e7jqba@google.com CREATED:20211126T202222Z DESCRIPTION:Title: Divide-and-conquer method for approximating output prob abilities of constant-depth\, geometrically-local quantum circuits\nSpeaker : Nolan Coble (QuICS)\nTime: Thursday\, December 2\, 2021 - 2:00pm\nLocat ion: Virtual Via Zoom: https://umd.zoom.us/j/97341197318\n\nMany schemes f or obtaining a computational advantage with near-term quantum hardware are motivated by mathematical results proving the computational hardness of sam pling from near-term quantum circuits. Near-term quantum circuits are often modeled as geometrically-local\, shallow-depth (GLSD) quantum circuits. Th at is\, circuits consisting of two qubit gates that can act only on neighbo ring qubits\, and that have polylogarithmic depth in the number of qubits. In this talk\, we consider the task of estimating output probabilities of G LSD circuits to inverse polynomial error. In particular\, we will demonstra te how the output state of a GLSD circuit can be approximated via a linear combination of product states\, each of which are produced via new GLSD cir cuits on approximately half the original number of qubits. We will show how this idea can be used to develop a classical divide-and-conquer algorithm for calculating the output probabilities of a 3D geometrically-local circui t. This talk is based on joint work with Matthew Coudron.\n\nReference: N. Coble\, M. Coudron. “Quasi-polynomial time approximation of output probabi lities of geometrically-local\, shallow quantum circuits.” arXiv:2012.0546 0 LAST-MODIFIED:20211126T202222Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/97341197318 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Nolan Coble TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211201T183000Z DTEND:20211201T193000Z DTSTAMP:20220808T214455Z UID:2e7bvrmavqebh7eo706jlp7vta@google.com CREATED:20211007T170435Z DESCRIPTION:Seminar will be conducted via zoom.

    Preceded by a virtua l lunch at 12:30pm

    Speaker: Scott Dodelson\, Carnegie Mellon Univers ity

    Title: Cosmic Structure with and beyond the Dark Energy Survey
    Abstract: There is now a well-defined fiducial model of the universe – “Lambda-CDM” – that accounts for almost all observational data. In partic ular\, we now have a compelling story of how the structure in the universe formed\, how “we got here.” The model itself though is theoretically precar ious\, depending on 2 or 3 pieces that have not been observed on Earth and\ , indeed\, may not exist. I report on attempts to stress-test this model wi th the largest optical survey of its kind\, the Dark Energy Survey\, presen ting results from the first 3 years of data. Then\, I speculate on one new idea for probing structures on the largest scales\, a probe that could lead to even tighter tests and/or new models that are more compelling.

    F or zoom link please email mknouse@umd.edu< /a> LAST-MODIFIED:20211123T181633Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Online Joint JHU/UMD Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211130T180000Z DTEND:20211130T190000Z DTSTAMP:20220808T214455Z UID:17l8u2m8oeq6105rdbgukr8bio@google.com CREATED:20211123T180000Z DESCRIPTION:Title: Verification with Minimal Overhead\, and Public Verifica tion of Quantum Computation\nSpeaker: Dominik Leichtle (Sorbonne University )\nTime: Tuesday\, November 30\, 2021 - 1:00pm\nLocation: ATL 3100A and Vir tual Via Zoom: https://umd.zoom.us/j/98741240626?pwd=QjhQNkI4WSt5S3Z0Rll2RH pJYjl4UT09 Meeting ID: 987 4124 0626 Passcode: 035986\n\nWith the developme nt of delegated quantum computation\, clients will want to ensure confident iality of their data and algorithms\, and the integrity of their computatio ns. In this talk\, I present recent work on two directions of research rela ted to blind and verified quantum computing.\nWhile protocols for blind and verifiable quantum computation exist\, they suffer from high overheads and from over-sensitivity: When running on noisy devices\, imperfections trigg er the same detection mechanisms as malicious attacks\, resulting in perpet ually aborted computations. We introduce the first blind and verifiable pro tocol for delegating BQP computations to a powerful server with repetitions as the only overhead. It is composable and statistically secure with expon entially low bounds and can tolerate a constant amount of global noise.\nEx isting protocols for verified quantum computing fall short of resolving con flicts between client and server from a third party’s perspective. In case the client rejects the outcome of a delegated computation on the basis of f ailed verification\, a third party will generally not be able to tell wheth er the abort of the protocol has been triggered by deviations by the client or by the server. We propose a new cryptographic protocol that provides th e same security guarantees as other blind verification protocols\, while ad ditionally resolving this conflict.\n\nhttps://umd.zoom.us/j/98741240626?pw d=QjhQNkI4WSt5S3Z0Rll2RHpJYjl4UT09\nMeeting ID: 987 4124 0626\nPasscode: 03 5986\n\nOne tap mobile\n+19294362866\,\,98741240626# US (New York)\n+130171 58592\,\,98741240626# US (Washington DC)\nDial by your location\n +1 929 436 2866 US (New York)\n +1 301 715 8592 US (Washington DC)\n +1 312 626 6799 US (Chicago)\n +1 669 900 6833 US (San Jose)\n +1 253 215 8782 US (Tacoma)\n +1 346 248 7799 US (Houston)\n Meeting ID: 987 4124 0626\nFind your local number: https://umd.zoom.us/u/ad sUSOKNiq\nJoin by SIP\n98741240626@zoomcrc.com\nJoin by H.323\n162.255.37.1 1 (US West)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114 .115.7 (India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244.1 40.110 (Germany)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Austra lia Melbourne)\n149.137.40.110 (Singapore)\n64.211.144.160 (Brazil)\n149.13 7.68.253 (Mexico)\n69.174.57.160 (Canada Toronto)\n65.39.152.160 (Canada Va ncouver)\n207.226.132.110 (Japan Tokyo)\n149.137.24.110 (Japan Osaka)\nMeet ing ID: 987 4124 0626\nPasscode: 035986\nEvents\nSeminars\nUpcoming Seminar s\nPast Seminars\nSpecial Events LAST-MODIFIED:20211123T180000Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/98741240626? pwd=QjhQNkI4WSt5S3Z0Rll2RHpJYjl4UT09 Meeting ID: 987 4124 0626 Passcode: 03 5986 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Dominik Leichtle TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211201T160000Z DTEND:20211201T171500Z DTSTAMP:20220808T214455Z UID:581uk9eok9dashf4rfg9cq28it@google.com CREATED:20210914T160029Z DESCRIPTION:Speaker: Sergei Tretiak\, LANL - \;https://www.lanl.g ov/search-capabilities/profiles/sergei-tretiak.shtml

    Title:  \;The Rise of Neural Networks for Materials and Chemical Dynamics

    Ab stract: Machine learning (ML) is quickly becoming a premier toolfor modelin g chemical processes and materials. Generally\, ML provides asurrogate mode l trained on the dataset of some reference data. This modelestablishes a re lationship between structure and underlying chemicalproperties\, guiding ch emical discovery. Designing high-quality training datasets is crucial to ov erall model accuracy. To address this this problem\, I willdescribe the act ive learning strategy\, in which new data are automaticallycollected for at omic configurations that produce large ML uncertainties. Thelocality approx imation underpinning favorable computational scaling of the MLmodels\, is a nother severe limitation that fails to capture long-range effectsthat may a rise from charge transfer\, polarization\, electrostatic or dispersioninter actions. I will also discuss how ML models can overcome nonlocality (via in troductionof interaction layers\, self-consistent cycles\, or charge equili bration schemes)and exemplify their performance for chemical problems with nonlocalities. Allthese advances are exemplified by applications to molecul es and materials.Exciting new method development and explosive growth of us er-friendly MLframeworks\, designed for chemistry\, demonstrate that the fi eld is evolvingtowards physics-based models augmented by data science.  \;

    References:

    1. J. S. Smith\, B. Nebgen\, N. Mathew\, J. C hen\, N. Lubbers\, L. Burakovsky\, S. Tretiak\, H. Ah Nam\, T. Germann\ , S. Fensin\, K. Barros\, “Automated discovery of a robust interatomic p otential for aluminum” Nature Comm. 12\, 1257 (20 21).
    2. A. E. Sifain\, L. Lystrom\, R. Messerly\, J. S. Smith\, B . Nebgen\, K. Barros\, S. Tretiak\, N. Lubbers\, and B. J. Gifford\, “Predicting Phosphorescence and Inferring Wavefunction Localization wi th Machine Learning\,” Chem. Sci.\, 12\, 10207 – 10217 (2021).
    3. R. Zubatyuk\, B. Nebgen\, J. S. Smith\, S. Treti ak and O. Isayev\, “Teaching neural network to attach and detach ele ctrons from molecules” Nature Comm. 12\, 4870 (2021).
    4. M. Kulichenko\, J. S. Smith\, B. Nebgen\, N. Fedik\, A. I. Boldyr ev\, N. Lubbers\, K. Barros and S. Tretiak\, “The rise of neural networks for materials and chemical dynamics\,” J. Phys. Chem. Lett. (Perspectives\, journal cover page) 12\, 6227 – 6244 (2021 ).

     \;

    Zoom location: \;https://umd.zoom.us /j/96861546458?pwd=ZzhtdmF6K1oxZGgxWWQ2R1RhNkJ2QT09

    Meeting ID : 968 6154 6458
    Passcode: 120121

    LAST-MODIFIED:20211123T123300Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211201T160000Z DTEND:20211201T171500Z DTSTAMP:20220808T214455Z UID:5mlrb1vn15loq09nllptkanc1j@google.com CREATED:20211122T232123Z DESCRIPTION:Title: Simulating conformal field theories\nSpeaker: Tobias Os borne (Leibniz Universität Hannover)\nTime: Wednesday\, December 1\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/9893676372?pwd= VVNOd2xNZ3FCblk4aFdTMjkzTllvQT09 (ID: 9893676372\, passcode: abc123)\n\nWha t does it mean to simulate a quantum field theory? This is a challenging qu estion because a majority of the quantum field theories relevant to fundame ntal physics lack a fully rigourous mathematical definition. Thus it is imp ossible in general to compare the predictions of discretised theories with their continuum counterparts. I will discuss these challenges and advocate the use of the recently introduced operator algebraic renormalization (OAR) as a means to provide both classical and quantum simulations of quantum fi eld theories\, in particular\, conformal theories. The OAR naturally provid es a direct mechanism to compare predictions from a cutoff lattice with a t arget continuum theory. LAST-MODIFIED:20211122T232124Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/9893676372?pwd=VVNOd2xNZ3F Cblk4aFdTMjkzTllvQT09 (ID: 9893676372\, passcode: abc123) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Tobias Osborne TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211130T210000Z DTEND:20211130T220000Z DTSTAMP:20220808T214455Z UID:0833uvu1kav9ck0d09mue7i13n@google.com CREATED:20211116T170030Z DESCRIPTION:Speaker: Ebony McGee\, Professor of Diversity and STEM Educatio n\, Peabody College of Education and Human Development\, Vanderbilt Univers ity

    Title: Dean's Voices of Inclusive Excellence Lecture Series - "B lack\, Brown\, Bruised: How Racialized STEM Education Stifles Innovation

     \;ABOUT THE TALK:

    Drawing on narratives from hundreds of Black\, Latinx\, and Indigenous individuals\, the speaker examines the exp eriences of underrepresented racially minoritized students and faculty memb ers who have succeeded in STEM. Based on this extensive research\, McGee ad vocates for structural and institutional changes to address racial discrimi nation\, stereotyping\, and hostile environments in an effort to make the f ield more inclusive. The lecture is based on \;McGee's bo ok\, of the same name\, which was published in 2020.

    ABOUT THE SPEAKER:
    Ebony McGee is a professor of diversity and STEM education at Vanderbilt University's Peabody College. She investigates what it means to be racially marginalized while minoritized in the context of learning a nd achieving in STEM higher education and in the STEM professions. She stud ies\, in particular\, the racialized experiences and racial stereotypes tha t adversely affect the education and career trajectories of underrepresente d groups of color. This involves exploring the social\, material\, and heal th costs of academic achievement and problematizing traditional forms of su ccess in higher education\, with an unapologetic focus on Black folk in the se places and spaces. Her NSF CAREER grant investigates how marginalization undercuts success in STEM through psychological stress\, interrupted STEM career trajectories\, impostor phenomenon\, and other debilitating race-rel ated trauma for Black\, Indigenous\, and Latinx doctoral students.

    Ed ucation is McGee's second career. She left a career in electrical engineeri ng to earn a Ph.D. in mathematics education from the University of Illinois at Chicago\, followed by a Spencer Postdoctoral Fellowship at the Universi ty of Chicago and a NSF Postdoctoral Fellowship at Northwestern University. She \;co-founded the \; Explorations in Diversifying Engineering Faculty Initiative \;and&n bsp\;the \;Institu te in Critical Quantitative and Mixed Methodologies Training for Underrepre sented Scholars \;(ICQCM)\, which aims to be a go-to resource for t he development of quantitative and mixed-methods skill sets that challenge simplistic quantifications of race and marginalization.

    This event is hosted and sponsored by the \;CMNS Diversity &\ ; Inclusion Advisory Council.

    If you have a question about this event\, please contact Abby Robinson at \;abbyr@umd.edu \;or 301-405-5845.

    NOTE: Recepti on held at 3:30pm


    LAST-MODIFIED:20211122T202143Z LOCATION:Bioscience Research Bldg.\, Room 1101\, 1st floor Atrium SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMNS Dean’s Voices of Inclusive Excellence Lecture Series TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211203T180000Z DTEND:20211203T190000Z DTSTAMP:20220808T214455Z UID:5s2nhmg5tplvs0f8kt0abp97u3@google.com CREATED:20210914T151430Z DESCRIPTION:Speaker: Natalia Gudino\, Ph.D.\, Staff Scientist\, Neurologica l Disorders and Stroke\, NIH


    Title: TBA


    Abstract: TBA


    Dr. Natalia Gudino received an Elec trical Engineering degree with honors from the National University of Rosar io\, Argentina in 2003. She pursued her graduate training at Case Western R eserve University (CWRU). First\, as a Fulbright Scholar\, she developed a steerable catheter controlled by the MRI system at Dr. Mark Griswold’s lab.

    After earning her M.Sc. (2008) in Biomedical Engine ering\, she started her Ph.D. research working on the development of on-coi l RF amplification to implement parallel transmission (pTx) in MRI. In a jo int collaboration with Dr. Robert Lederman and Dr. Robert Balaban (NHLBI)\, she expl ored the impact of this technology on improving RF safety in an interventio nal MRI setup. After receiving her Ph.D. in 2013\, she joined\, Dr. Jeff Du yn’s lab at LFMI\, \;NINDS\, to develop new on-coil RF amplifiers that can be ut ilized in ultra-high field MRI (≥7T)\, and a novel electronic interface tha t allows control of the new technology by a broad range of commercial syste ms.

    She became a Staff Scientist in the MRI Engineering Core in 2018. Dr. Gudino is an active member of the International Society of Magnetic Re sonance in Medicine and a recipient of the 2017 outstanding teacher award f or lecturing RF engineering. As a Staff Scientist her research mainly focus es on new technologies for RF transmission and signal reception to improve brain imaging at ultra-high field.


    FOR RESEARCHERS

    LAST-MODIFIED:20211122T143430Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211201T173000Z DTEND:20211201T200000Z DTSTAMP:20220808T214455Z UID:6aeg48oj4l76oqqii0rkbrmaeo@google.com CREATED:20211119T151659Z DESCRIPTION:Speaker Name: Scott Dodelson

    Speaker Institution : Carne gie Mellon University

    Title : "Cosmic Structure With and Beyond the Dark Energy Survey"

    Abstract : There is now a well-defined fiducial model of the universe – “Lambda-CDM” – that accounts for almost all observa tional data. In particular\, we now have a compelling story of how the stru cture in the universe formed\, how “we got here.” The model itself though i s theoretically precarious\, depending on 2 or 3 pieces that have not been observed on Earth and\, indeed\, may not exist. I report on attempts to str ess-test this model with the largest optical survey of its kind\, the Dark Energy Survey\, presenting results from the first 3 years of data. Then\, I speculate on one new idea for probing structures on the largest scales\, a probe that could lead to even tighter tests and/or new models that are mor e compelling.

    Notes: Virtual lunch at 12:30 PM\, virtual talk at 1:3 0 PM

    Zoom information:
    https://zoom.us/j/96801941719?pwd=< wbr>Wm16MnplYzJYVTZ4K1BocE80Yndxdz09 \;(Meeting ID: 968 0194 1 719\, with Passcode: 1866)

    Name: Sally Megonigal
    E-Mail: \;smegonig@umd.edu LAST-MODIFIED:20211119T151659Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211129T210000Z DTEND:20211129T220000Z DTSTAMP:20220808T214455Z UID:3v5b5jkkoa7flvrdkf3m17imgs@google.com CREATED:20211019T132226Z DESCRIPTION:

    Title: \;A song of ice and fire: Cryo-EM interrog ation of the HSP90 molecular chaperone machinery

    Speaker< /b>: \;Yanxin Liu\, University of Maryland

    Hosted by: \;Jeffery Klauda &\; Arpita Upadhyaya

    < p>Abstract: \;Heat Shock Protein 90 (Hsp90) is a ubiquitous mole cular chaperone that facilitates the folding and maturation of hundreds of “client” proteins\, highly enriched for signaling and regulatory processes. Despite the functional importance\, how Hsp90 mediates client protein matu ration and how this process is regulated by co-chaperones are largely unkno wn. In this presentation\, I will share three stories that address these qu estions. First\, we established the human succinate dehydrogenase B (SdhB) from respiratory complex II as the first mitochondrial Hsp90 (Trap1) client protein amenable to detailed biochemical investigation. The cryo-EM struct ure of the Trap1:SdhB complex elucidated the interplay between Hsp90 and pa rtially unfolded SdhB\, demonstrating a highly conserved client interaction mechanism. Second\, we made an unexpected discovery that Trap1 exists in m ultiple tetrameric states in addition to the canonical dimeric state. With the help of SdhB\, we obtained one of the tetrameric Trap1 structures at hi gh resolution using cryo-EM. Third\, we determined atomic resolution struct ures for cytosolic Hsp90 in complex with the ATPase-accelerating co-chapero ne Aha1 in both yeast and human system. The structures revealed that Aha1 f unctions as a conformational and chemical activator that catalyzes the Hsp9 0 cycle by breaking the barriers between 6 distinct and sequentially stabil ized states.

    Zoom Link:
    https://umd.zoom.us/j/ 97881020532?pwd=L1ArV203ZlBmU1daMUtwd3VzUlppUT09
    < b>Meeting ID: 978 8102 0532
    Passcode: 504141

    BIPH website: https:// ipst.umd.edu/graduate-programs/biophysics/events

    LAST-MODIFIED:20211119T144130Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211118T213000Z DTEND:20211118T223000Z DTSTAMP:20220808T214455Z UID:6i9et5bob8r30jsg4q3083lldi@google.com CREATED:20211011T190300Z DESCRIPTION:Speaker: Guillermo Franco Abellan\, University of Montpellier\n \nTitle: The H0 Olympics: a fair ranking of proposed models\n\n\nAbstract: Despite the remarkable success of the ΛCDM model\, a growing experimental discrepancy (at the level of 4-5σ) has emerged in the determination of the Hubble constant using different probes. While a vast array of ΛCDM extensio ns have been proposed to explain this discrepancy\, understanding the (rela tive) success of these models in resolving the tension has proven difficult -- this is a direct consequence of the fact that each model has been subje cted to differing\, and typically incomplete\, compilations of data. In thi s talk\, I discuss a systematic comparison of sixteen different models whic h have been proposed to resolve the Hubble tension\, and explain how to qua ntify the relative success of each using a series of metrics and a vast arr ay of data combinations. I will finish by describing in more detail one of these proposed models\, a 2-body dark matter decay\, and show how\, despite not resolving the Hubble tension\, it provides a natural explanation for t he milder 2-3σ anomaly in the structure growth parameter (the S8 tension) a nd has also other interesting implications for model-building and the Xenon -1T excess. LAST-MODIFIED:20211118T165154Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Special EPT Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211203T170000Z DTEND:20211203T174500Z DTSTAMP:20220808T214455Z UID:1st53u07r6fdq3p4o0o5hhcm9p@google.com CREATED:20211118T164240Z DESCRIPTION:Title: Quantum Routing with Fast Measurements and Classical Fe edback\nSpeaker: Dhruv Devulapalli (QuICS)\nTime: Friday\, December 3\, 202 1 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j /99484119207\n\nTheoretical models of quantum computation usually assume th at 2-qubit gates can be performed between arbitrary pairs of qubits. Howeve r\, in practice\, scalable quantum architectures have qubit connectivity co nstraints\, which can introduce polynomial depth overheads. Compiling quant um algorithms to work on scalable architectures therefore requires optimizi ng arrangements of gates and qubits to minimize these overheads. In this ta lk\, I will discuss the problem of implementing arbitrary permutations of q ubits under interaction constraints in quantum systems that allow for fast local operations and classical communication (LOCC). I will show examples o f speedups over SWAP-based methods by using fast measurement and classical feedback to perform quantum teleportation. Further\, I will describe an exa mple of an interaction graph for which fast LOCC gives a logarithmic speedu p in the worst-case routing time over SWAP-based routing. I will also discu ss limits on the speedup afforded by quantum teleportation.\n\nPizza and dr inks served after the talk. LAST-MODIFIED:20211118T164240Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Dhruv Devulapalli TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211129T213000Z DTEND:20211129T223000Z DTSTAMP:20220808T214455Z UID:3drpefcn4kvjboslujbb1p1o85@google.com CREATED:20211110T185852Z DESCRIPTION:Title: Studies of Jovian Radio Emission and the Search for Extr asolar Planets/Space Weather\n\nAuthor: Tracy Clarke\, Naval Research Labor atory\n\nAbstract: The discovery of planetary radio emission from Jupiter 6 6 years ago marked the beginning of a new way to explore our solar system. This low frequency emission is powered by the interaction of the Jovian mag netosphere with the Solar wind and Galilean moon Io. All magnetized planets in the solar system have been detected through low frequency emission from their magnetospheres. Study of this emission allows not only the identific ation of the presence of planetary magnetic fields but also provies an esti mate of the planetary field strength. I will present recent studies of Jovi an decametric emission from the Long Wavelength Array. Planetary magnetic f ields may play a critical role in determining the habitability of a planet by shielding the surface from cosmic rays and the stellar wind. The search for exoplanet radio emission and space weather has come to the forefront wi th the development of new sensitive low frequency instruments and calibrati on techniques. I will highlight a few of the recent exciting results in thi s field.\n\nNotes: Join the meeting at 4:15 for meet and greet LAST-MODIFIED:20211117T184910Z LOCATION:Online via Zoom\, visit https://bit.ly/2PmJoT6 for access SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211130T170000Z DTEND:20211130T183000Z DTSTAMP:20220808T214455Z UID:5q0bjevg1ml5ic9u6c0it6g800@google.com CREATED:20211116T212804Z DESCRIPTION:

    Title: \;< a>Taking the Leap and the (RF) path less traveled by

    Speaker: \;< /span>Melissa Midzor

    Aff iliation: National Institute of Standards and Technology\, Boulder\, Colora do


    Abstract: \;An obsession with magnets at a young age led Dr. Midzor to pursue a life i n physics and RF measurement techniques. \; Her career has spanned deve loping a new RF microscopy method for nanotechnology\, overcoming challenge s in electronic warfare protection against adversaries’ radars and Improvis ed Explosive Devices (IEDs)\, and improving compatibility between Federal a nd Commercial wireless systems. \; Melissa will be discussing highlight s from these projects\, and how her approach of taking career leaps\, plann ing\, and pursing her passions led to unique science and career opportuniti es. \;


    About the speaker: Since 2 018\, Melissa Midzor has worked at the National Institute of Standards and Technology (NIST) in Boulder\, Colorado. \;She is Program Manager for t he National Advanced Spectrum and Communications Test Network (NASCTN)\, a multi-agency organization chartered in 2015 to organize a national network of Federal\, academic\, and commercial partners that provides testing\, mod eling and analysis necessary to develop and deploy spectrum-sharing technol ogies and inform future spectrum policy and regulations. A native Coloradan \, Melissa received a B.A. in physics and sociology from the University of Colorado\, Boulder\, and a Ph.D. in nanotechnology from the California Inst itute of Technology supervised by Michael Roukes. Following a stint in McKi nsey &\; Company\, Melissa joined the U.S. Navy Naval Air Systems Comman d (NAVAIR)\, where she served 16 years in roles including \;Division Di rector of Electronic Warfare Integrated Laboratories at \; Naval Air Station Point Mugu\, \;and \;&n bsp\;Assistant to the Secretary of Defense Electronic Warfare and Counterme asures Office at \;the Pentagon. \;

    Attendance at JQI Career Seminars is limi ted to students\, \;postdoctoral associates \;an d junior members of staff. Lunch will be provided to participants af terward and the speaker will be available for informal discussions. \;< /span>This seminar is co-sponsored by the University of Marylan d Women in Physics\, \;htt ps://wip.umd.edu/ \; \;







    LAST-MODIFIED:20211117T164154Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Quantum Institute Career Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211118T143000Z DTEND:20211118T153000Z DTSTAMP:20220808T214455Z UID:2klrk7hktdhaliat5k69m84f1h@google.com CREATED:20211116T182225Z DESCRIPTION:





    Speaker: Saeed Kha n\, Princeton
    Title: \;Physical reservoir computing using fini tely-sampled quantum systems

    Abstract: \;The paradi gm of reservoir computing exploits the nonlinear dynamics of a physical res ervoir to perform complex time-series processing tasks such as speech recog nition and forecasting. Unlike other machine-learning approaches\, reservoi r computing relaxes the need for optimization of intra-network parameters\, and is thus particularly attractive for near-term hardware-efficient quant um implementations. However\, the complete description of practical quantum reservoir computers requires accounting for their placement in a quantum m easurement chain\, and its conditional evolution under measurement. Consequ ently\, training and inference has to be performed using finite samples fro m obtained measurement records. Here we describe a framework for reservoir computing with nonlinear quantum reservoirs under continuous heterodyne mea surement. Using an efficient truncated-cumulants representation of the comp lete measurement chain enables us to sample stochastic measurement trajecto ries from reservoirs of several coupled nonlinear bosonic modes under stron g excitation. This description also offers a rigorous mathematical basis to directly compare the computational performance of a given physical reservo ir operated across classical and quantum regimes\, considering a variety of practical performance metrics such as fidelity\, sample-efficiency\, and t ime-to-solution. Even for a reservoir as small as a single node where entan glement cannot play a role\, we show that operation deeper in the quantum r egime offers a modest but statistically significant advantage in sample-eff iciency for learning Gaussian quantum states that have the same mean but di stinct variances. Further\, comparing the same metrics we show that certain other state learning tasks are better performed by reservoirs in the class ical regime. Our results also identify the vicinity of classical bifurcatio n points as presenting optimal conditions for nonlinear processing by an os cillator-based quantum reservoir. The considered models are directly realiz able in modern circuit QED experiments\, while the framework is applicable to more general quantum nonlinear reservoirs.

    arXiv:2110.13849
     \;
     \;
    L ocation: PSC 2136

    Host: Kanu Sinha/Alicia Kollár LAST-MODIFIED:20211116T182225Z LOCATION:PSC2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211117T160000Z DTEND:20211117T171500Z DTSTAMP:20220808T214455Z UID:5272pbj957396kjeo3vosfi9bl@google.com CREATED:20211115T155147Z DESCRIPTION:Title: A review and recent progress in quantum error - mitigat ion\nSpeaker: Kristan Temme (IBM)\nTime: Wednesday\, November 17\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/6803241833\n\nNe ar-term applications of early quantum devices\, such as quantum simulations \, rely on accurate estimates of expectation values to become relevant. Dec oherence and gate errors lead to wrong estimates. This problem was\, at lea st in theory\, remedied with the advent of quantum error correction. Howeve r\, the overhead that is needed to implement a fully fault-tolerant gate se t with current codes and current devices seems prohibitively large. In tur n\, steady progress is made in improving the quality of the quantum hardwar e. This leads to the question: what computational tasks could be accompli shed with only limited\, or no error correction? In this talk we first revi ew two simple techniques for quantum error mitigation that increase the qua lity of short-depth quantum simulations. The first method\, extrapolation to the zero noise limit\, subsequently cancels powers of the noise perturb ations by an application of Richardson’s deferred approach to the limit. Th e second method cancels errors by resampling randomized circuits according to a quasi-probability distribution. The two schemes are presented and we w ill discuss their application in recent experiments. Furthermore we will di scuss recent progress on applying error mitigation techniques to logical qu bits that don't support a universal gate set and show how to implement enco ded Clifford+T circuits. Here the Clifford gates are protected from noise b y error correction while errors introduced by noisy encoded T-gates are mit igated using the quasi-probability method. As a result\, Clifford+T circuit s with a number of T-gates inversely proportional to the physical noise rat e can be implemented on small error-corrected devices without magic state d istillation. LAST-MODIFIED:20211115T155147Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/6803241833 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Kristan Temme TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211115T210000Z DTEND:20211115T220000Z DTSTAMP:20220808T214455Z UID:38ufvt6cpbbck1ouho5oerfo97@google.com CREATED:20210826T201204Z DESCRIPTION:

    Title: \;Predicting RNA structure and R NA-ligand docking fromlimited data

    Speaker< /strong>: \;Shi-Jie Chen\, Universityof Missouri-Colum bia

    Hostedby: \;Theodore Kwaku Dayie

    < p>Abstract: \;Ribonucleicacid (RNA) molecules play spe ctacularly versatile roles in living cells.Emerging biomedical advances suc h as precision medicine and synthetic biologypoint to RNA as the central re gulator and information carrier. \; \;We are interested in predicti ng RNA structure\,stability\, and kinetics from the nucleotide sequence\, a nd the design ofmolecules for therapeutic applications. \; \;For ex ample\,given the limited availability of crystal/NMR structures\, how to bu ild thenative fold from the sequence? For a given RNA target\, how to predi ct RNA-smallmolecule interaction and identify small molecules as potential drugs? Usingphysical and chemical principles\, we recently developed IsRNA for RNA 3Dstructure prediction and RLDock for RNA-small molecule interactio ns. I willdescribe these novel approaches and the proof of principles in RN A 3D structureprediction and in predicting RNA-small molecule docking.  \; \;

    Zoom Link:
    https://umd.zoom.us/j/978 81020532?pwd=L1ArV203ZlBmU1daMUtwd3VzUlppUT09
    M eeting ID: 978 8102 0532
    Passcode: 504141

    BIPH website: http s://ipst.umd.edu/graduate-programs/biophysics/events

    LAST-MODIFIED:20211115T152449Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211213T210000Z DTEND:20211213T220000Z DTSTAMP:20220808T214455Z UID:1g7i6dio99dph1nnofog3ld1p2@google.com CREATED:20210826T201410Z DESCRIPTION:

    Title: \;TBA

    Speaker: \;Huang Chiao Huang\, University of Maryland

    Hosted by: \;Jeffery Klauda &\; Arpita Upadhyaya

    Abstract: TBA

    BIPH website: https://ipst.umd.edu/graduat e-programs/biophysics/events


    LAST-MODIFIED:20211115T152337Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar (In-person) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211206T210000Z DTEND:20211206T220000Z DTSTAMP:20220808T214455Z UID:39lp5gc84f9tjcalhp6ilshsq7@google.com CREATED:20210830T155217Z DESCRIPTION:

    Title: \;Super-resolution imaging of ch romatin organization in health and disease

    Speaker:& nbsp\;Melike Lakadamyali\, University of Pennsylvania

    Hosted by: \;Arpita Upadhyaya

    Abstract : Human DNA is 2 meters in length and must be packaged into the small space of a cell’s nucleus. New technologies\, including super-resolution microsc opy\, are revealing how the genome is folded and packaged inside intact nuc lei. I will present our work on using super-resolution microscopy to visual ize and quantify chromatin nano-structure in single cells. I will further t alk about how the chromatin nano-structure can be remodeled via chemo-mecha nical cues. Finally\, I will show that degenerative chemo-mechanical cues d uring disease can lead to aberrant chromatin nano-structure\, potentially i mpacting cell phenotype. \;

    Zoom Link:
    https://um d.zoom.us/j/97881020532?pwd=L1ArV203ZlBmU1daMUtwd3VzUlppUT 09
    Meeting ID: 978 8102 0532
    Passcode: 504141

    BIPH website: \;https://ipst.umd.edu/graduate-programs/biophysics/e vents

    LAST-MODIFIED:20211115T152257Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar (Virtual) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211122T210000Z DTEND:20211122T220000Z DTSTAMP:20220808T214455Z UID:0sq5qhlrufqehs7d4pthgvidmk@google.com CREATED:20211015T170256Z DESCRIPTION:

    Title: \;Elucidating structure-property relationships of embryonic tendon to inform adult healing strategies

    Speaker: \;Catherine Kuo\, Universit y of Maryland

    Hosted by: \;Jeffery Klauda &\; Arpita Upadhyaya

    Abstract: \;Tend ons play critical roles in skeletal movement and stability\, yet when injur ed are incapable of restoring native functional properties through healing. Our research program aims to advance tendon regenerative medicine strategi es by identifying critical physicochemical regulators of embryonic tendon m echanobiology. In particular\, characterizations of structure-property rela tionships of embryonic tendons have identified key regulators of tendon for mation that may serve as therapeutic targets for adult tendon regeneration. We are also studying the mechanobiology of embryonic tendon development wi th the goal of developing in utero interventions to prevent and treat conge nital musculoskeletal birth deformities.

    Biography:&nb sp\;Catherine K. Kuo is an Associate Professor of Bioengineering a t the University of Maryland\, College Park. She also holds an appointment in the Department of Orthopaedics in the School of Medicine at the Universi ty of Maryland\, Baltimore. She has received multiple honors and awards inc luding the Orthopaedic Research Society (ORS)-GoLife Innovation in Research Award\, Emerging Investigator Award by \;Stem Cell Research and The rapy\, March of Dimes Basil O’Connor Starter Scholar Research Award\, a nd NSF CAREER Award. Her research has been continuously funded by the NIH\, DoD\, NSF\, the March of Dimes Foundation\, and industry. Dr. Kuo is an el ected fellow of American Institute for Medical and Biological Engineering ( AIMBE\, Class of 2019) and was elected to the Council for the Tissue Engine ering and Regenerative Medicine Society of Americas (TERMIS-AM) in 2020. Dr . Kuo will assume the role of Editor-in-Chief of the \;Journal of Ti ssue Engineering and Regenerative Medicine \;(Wiley publication) on January 1\, 2022. She also serves on the ORS Publications Advisory Board f or the \;Journal of Orthopaedic Research\, and on multiple edito rial boards of major journals in the fields of tissue engineering and regen erative medicine\, biomaterials\, orthopaedics\, and biomedical engineering . She received her B.S.E. in materials science and engineering and Ph.D. in biomaterials and macromolecular science and engineering from the Universit y of Michigan and did her postdoctoral studies at the NIH in the Cartilage Biology and Orthopaedics Branch.

    BIPH website: https://ipst.umd.edu/gr aduate-programs/biophysics/events

    LAST-MODIFIED:20211115T151922Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar (In-Person) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211115T210000Z DTEND:20211115T223000Z DTSTAMP:20220808T214455Z UID:2tidi71qu5kbgeerrcrvtae397@google.com CREATED:20211111T142613Z DESCRIPTION:Speaker 1: Arthur Carlton Jones

    Title: Determining UTe2 \;surface impedance through microwave resonance measur ements \;

    Abstract: The complex surface impedance of a supercondu ctor provides many insights into its properties\, such as the pairing mecha nism\, super- and normal-fluid responses\, and possibly it’s topological pr operties. We explore the surface impedance of a UTe2 \;singl e crystal as a function of temperature using resonant cavity measurements f or a variety of microwave-frequency modes. By determining the resonant freq uency and quality factor over a range of temperatures\, we reconstruct the surface impedance of the sample. We match the behavior of the resistance an d reactance in the normal state to their expected behavior\, determined by the normal state resistivity.  \;Since UTe2 \;is anisotr opic\, we take a linear combination of the losses corresponding to each cry stallographic direction to do this fitting. Through this method\, the aniso tropic nature of UTe2 \;allows us to determine the combinati on of crystallographic directions excited in each resonant mode. We present the results of the anisotropic surface impedance temperature dependence in the superconducting and normal states\, as well as additional quantities w hich can be determined from the surface impedance including complex conduct ivity\, penetration depth\, and quasiparticle scattering time. We relate th e results to topics of current interest in this unique material.


    Adv isor: \; Steven Anlage \;





    Speaker 2: Raymond Mencia

    Title: Blochnium: A \; \;flux-insensit ive qubit with flux-tunable interactions

    Abstract:
    We introduce a flux-like qubit\, nicknamed 'blochnium'\, whose 0-1 transition frequency i s nearly insensitive to the external flux bias \;and is dual to transmo n. Blochnium is created by shunting a small Josephson junction with a \ ;hyperinductance\, that is -- a maximal per-unit-length inductance that has minimal stray capacitance and is probably the highest impedance electromag netic structure available today (Z \; >\; 200 kOhms). To achieve such inductances\, we release the entire circuit from the high dielectric subst rate and suspend it almost entirely in vacuum. The qubit’s spectrum reveals a 0-1 flux dispersion on the order of a hundred MHz which becomes exponent ially suppressed when decreasing the ratio EL/EC providing protection again st 1/f flux noise. However\, the higher transitions remain flux-sensitive a llowing for multi-qubit operations. We report on recent coherence propertie s of blochnium with varying device design and etching techniques.

    Ad visor: Vladimir Manucharyan \;


    Location: Phys Toll Rm#1201Seminar also on ZOOM: \;  \;https://umd.zoom.us/j/97540478019 LAST-MODIFIED:20211112T211540Z LOCATION:John Physics Rm 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Arthur Carlton Jones/Raymond Mencia Mencia TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211115T200000Z DTEND:20211115T213000Z DTSTAMP:20220808T214455Z UID:4ld7inifcs8balcpnvhb4p9n3i@google.com CREATED:20211112T181436Z DESCRIPTION:Seminar will be conducted via zoom.

    Speaker: Chen Sun\, Tel Aviv University

    Title: Novel Astrophysical Probes of Axion Dark Matter

    Abstract: In this talk\, I will describe a few recent d evelopments in constraining axion dark matter. In particular\, I will discu ss using disk galaxy rotation data to constrain the soliton component in ea ch SPARC galaxy. By combining with the simulation results\, this can be fur ther translated to a constraint on the cosmological density of ultralight d ark matter\, in the mass range of m <\;~ 10^{-20} eV. I will show that it covers a slightly different mass range independent from and complementary to Lyman alpha constraints. In the second half of the talk\, I will briefly discuss a novel approach to constrain axion-photon coupling by observing t he echo signals in directions opposite to existing supernova remnants (SNR) in the radio band. Based on a recent work\, we point out that the strength of the "echo" signal from axion stimulated decay depends on the history of photon source. We identify SNR as promising candidates -- even though they are dim today -- and show that they could lead to the strongest bound of p hoton-axion coupling for axions around 10^{-6} eV. We also make future proj ections for undetected SNR and young supernova explosions.

    For zoom link please email mknouse@umd.edu LAST-MODIFIED:20211112T181642Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211119T170000Z DTEND:20211119T174500Z DTSTAMP:20220808T214455Z UID:1i8ee7qtb6olb5n0iakcdpss30@google.com CREATED:20211112T163742Z DESCRIPTION:Title: FQS Industry talk- Leidos\nSpeaker: Allyson O'Brien (Le idos)\nTime: Friday\, November 19\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207\n\nIn this special Frid ay Quantum Seminar\, Dr. Allyson O'Brien\, a Quantum Technology Scientist a t Leidos\, will share stories from her career path and a broader perspectiv e on the field.\n\nPizza and drinks served after the talk. LAST-MODIFIED:20211112T163742Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Allyson O'Brien TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211112T183000Z DTEND:20211112T193000Z DTSTAMP:20220808T214455Z UID:3vbj2tkpv9j7t06k9mhv1l4n6o@google.com CREATED:20210809T204512Z DESCRIPTION:**Joint Cornell/ UMD Seminar**

    Speaker: Josh Rude rman\, NYU

    Preceded by lunch at 12:30pm.

    Title: Dark Sector Prospects Away from Equilibrium

    Abstract: Different cosmologies for dark matter\, or dark radiation\, lead to diver se observational prospects. Standard Model particles were in thermal equil ibrium at early times. A simple and predictive ansatz is that the dark sec tor was also in thermal equilibrium. In this talk I will consider the oppo site regime\, where dark matter or dark radiation is produced through non-e quilibrium processes. I will describe how oscillations between photons and dark photons can be tested by 21cm cosmology and radio observations. I wi ll also show that dark matter may have been produced through an explosive p eriod of exponential growth\, in analogy to the spread of contagions.
    For info\, contact mknouse@umd.edu LAST-MODIFIED:20211112T142212Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint Cornell/ UMD Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211118T163000Z DTEND:20211118T173000Z DTSTAMP:20220808T214455Z UID:757fk7urp96c5h7csuenrj8es6@google.com CREATED:20210825T151245Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoom.u s/j/99485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min so cial hour at 11am with the seminar at 11:30am

    Speaker: Anna Watts\, University of Amsterdam

    Title: A NICER view of neutron stars


    Abstract: NICER\, the Neutron Star Interior Composition Explorer\, is an X-ray telescope that was installed on the International Space Station i n 2017. Its mission is to study the nature of the densest matter in the Uni verse\, found in the cores of neutron stars. NICER uses Pulse Profile Mode ling\, a technique that exploits relativistic effects on X-rays emitted fro m the hot magnetic polar caps of millisecond pulsars. The technique also lets us map the hot emitting regions\, which form as magnetospheric particl es slam into the stellar surface. I will present NICER's latest results - including a measurement of the radius of the highest mass pulsar known - an d discuss the implications for our understanding of ultradense matter\, pul sar emission\, and stellar magnetic fields. I will also look ahead to the next generation of X-ray telescopes that will exploit the Pulse Profile Mod elling technique. LAST-MODIFIED:20211112T142129Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211117T203000Z DTEND:20211117T213000Z DTSTAMP:20220808T214455Z UID:1nltmb8jva8r1uo4onvmu8c5le@google.com CREATED:20211111T152103Z DESCRIPTION:Title : Quantum Acoustics with Superconducting Qubits

    Sp eaker Name: Dr. Andrew N Cleland\, Pritzker School of Molecular Engineering \, University of Chicago

    Abstract : Superconducting qubi ts provide an excellent system for building quantum computing systems\, due to their good individual qubit metrics\, the availability of a high fideli ty two-qubit entangling gate\, and their easy lithographic scaling to large qubit numbers. In addition\, these qubits provide unique opportunities as testbed systems for quantum communication as well as developing hybrid quan tum systems. One compelling opportunity is in quantum acoustics\, where ind ividual phonons can be generated and detected. I will describe our recent p rogress in coupling superconducting qubits to surface acoustic waves at the single phonon level. In one experiment we have demonstrated the quantum co ntrol of a single microwave-frequency mechanical mode in a surface acoustic wave (SAW) resonator. In a second experiment\, we have launched and receiv ed itinerant phonons in an acoustic Fabry-Perot resonator\, and generated a phonon-mediated entanglement between two qubits. While likely my presentat ion won’t have time to cover this. we have further successfully leveraged c oncepts from quantum optics and demonstrated a quantum eraser.






    Contact: Kim Pinckney-Lewis
     \;kimpl@lps.umd.edu


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    LAST-MODIFIED:20211111T152150Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20211122T160000 DTEND;TZID=America/New_York:20211122T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211214;BYDAY=MO EXDATE;TZID=America/New_York:20211129T160000 EXDATE;TZID=America/New_York:20211206T160000 EXDATE;TZID=America/New_York:20211213T160000 DTSTAMP:20220808T214455Z UID:jkjo24susmror8foduuc6t6h2e@google.com CREATED:20210924T114034Z DESCRIPTION:Speaker 1: Heshan Yu\n\nTitle: TBD\n\n\n\nNote: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20211111T142040Z LOCATION:Toll Physics Rm 1201 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Heshan Yu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211206T213000Z DTEND:20211206T223000Z DTSTAMP:20220808T214455Z UID:287ud2ns489o9b34baojsci696@google.com CREATED:20211110T185647Z DESCRIPTION:Title: High-energy neutrinos from AGN jets\n\nSpeaker: Foteini Oikonomou\, Norwegian University of Science and Technology\n\nAbstract: The recent discovery of high-energy astrophysical neutrinos has opened a new w indow to the Universe. Identifying the sources of these neutrinos is the ma in focus of the emerging field of neutrino astronomy. Combining neutrino da ta and electromagnetic measurements in a multi-messenger approach may lead us to the sources of the neutrinos and help to solve the long-standing big question of the origin of high-energy cosmic rays. A leading candidate sour ce population is active galactic nuclei (AGN)\, which host accreting superm assive black holes and relativistic jets. In this talk\, I will review the current status of the field and what we know about the possible role of jet ted AGN as sources of high-energy neutrinos.\n\nNotes: Join the meeting at 4:15 for meet and greet LAST-MODIFIED:20211110T185647Z LOCATION:Online via Zoom\, visit https://bit.ly/2PmJoT6 for access SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211117T193000Z DTEND:20211117T203000Z DTSTAMP:20220808T214455Z UID:12t3647b58i319glksqmau6mm2@google.com CREATED:20211109T175832Z DESCRIPTION:Speaker Name: Alexis Marret

    Speaker Institution : Sorbon ne/Paris Observatory

    Title : The non-resonant streaming instability: from theory to experiments

    Abstract : Cosmic rays can power the exp onential growth of a seed magnetic field by exciting instabilities that fee d on the kinetic energy of the particles collective streaming motion. Of th e different streaming instabilities\, the non-resonant mode has received gr owing attention as it can amplify the magnetic field well beyond its initia l intensity\, and generate the necessary turbulence to help confine and acc elerate cosmic rays in supernovae remnants and young stellar jets shocks. I n general\, it can develop in a large variety of environments\, ranging fro m the cold and dense molecular clouds to the hot and diffuse intergalactic medium.

    This work aims at elucidating the behaviour of the non-reson ant cosmic rays streaming instability in such environments\, where thermal and collisional effects can substantially modify its growth and saturation. To study the instability in hot environments\, where finite Larmor radius effects are important\, we resort to linear kinetic theory and extend the e xisting analytical results to the case of decoupled ions and magnetic pertu rbations. We find that the unstable wavelengths are not entirely suppressed \, but are instead shifted toward larger scales with a strongly reduced gro wth rate.

    The linear theory results are confirmed and extended to th e non-linear evolution by using multi-dimensional hybrid-Particle-In-Cell s imulations (kinetic ions and fluid electrons). The simulations highlight an important reduction of the level of magnetic field amplification in the ho t regime\, indicating that it may be limited in hot astrophysical plasmas s uch as in superbubbles or the intergalactic medium. In colder and denser en vironments\, such as H II regions and molecular clouds\, particle collision s in the background plasma must be taken into account. We investigate numer ically their impact by including Monte-Carlo Coulomb and neutral collisions in the simulations. We find that the instability is rapidly suppressed in poorly ionized plasmas. In contrast\, we find that in fully ionized plasmas \, Coulomb collisions unexpectedly favour the development of the instabilit y by reducing self-generated pressure anisotropies that would otherwise opp ose its growth.

    Numerical simulations are currently the only means t o investigate the non-linear evolution of the instability and to obtain qua ntitative estimates of the saturated magnetic field intensity. The final pa rt of this work is devoted to answer the growing need for an experimental v erification of the linear theory and simulations predictions. We describe s ome of the requirements on the plasma parameters to generate the instabilit y in an experiment\, and propose two preliminary setups based on existing h igh-power laser facilities\, aiming at observing and characterizing the non -resonant mode for the first time in the laboratory.

    Host Name: Marc Swisdak
    Host E-Mail: \;swisdak@umd .edu LAST-MODIFIED:20211109T175832Z LOCATION:Virtual: Contact swisdak@umd.edu for Zoom link SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211118T150000Z DTEND:20211118T160000Z DTSTAMP:20220808T214455Z UID:73cn3svrvcnk7rh2thjp6edton@google.com CREATED:20211109T153442Z DESCRIPTION:Title: Distinguishing between quantum and classical Markovian dephasing dissipation\nSpeaker: Alireza Seif (University of Chicago)\nTime: Thursday\, November 18\, 2021 - 10:00am\nLocation: ATL 3100A and Virtual V ia Zoom: https://umd.zoom.us/j/2639797355\n\nUnderstanding whether dissipat ion in an open quantum system is truly quantum is a question of both fundam ental and practical interest. We consider a general model of n qubits subje ct to correlated Markovian dephasing\, and present a sufficient condition f or when bath-induced dissipation can generate system entanglement and hence must be considered quantum. Surprisingly\, we find that the presence or ab sence of time-reversal symmetry (TRS) plays a crucial role: broken TRS is r equired for dissipative entanglement generation. Further\, simply having no n-zero bath susceptibilities is not enough for the dissipation to be quantu m. Our work also present an explicit experimental protocol for identifying truly quantum dephasing dissipation\, and lays the groundwork for studying more complex dissipative systems and finding optimal noise mitigating strat egies. LAST-MODIFIED:20211109T153442Z LOCATION:ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j/2639797355 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS Special Seminar: Alireza Seif TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211119T180000Z DTEND:20211119T190000Z DTSTAMP:20220808T214455Z UID:54msdmgmclikchf7464gh88go5@google.com CREATED:20210914T151241Z DESCRIPTION:Speaker: Abraham Anapolsky\, Senior Manager\, Toyota Research I nstitute

    Title: Getting from Here to There: Why Scale Bridging is Im portant

    Abstract: Scale bridging problems define many of our important materials engineering problems\, in energy systems\, alloys\, bio medical devices\, and cancer research. As engineers and scientists we have effective analytical methods for describing materials at length scales of m eters down to 10 microns\, and from atoms to the unit cell\, but in the so- called meso scale\, we observe emergent behavior with limited understanding . Our lack of understanding of phenomena on this scale makes it challenging to fulfill the promise of quantum mechanics as a design paradigm for mater ials engineering. The goal of this seminar is to stimulate discussion on a useful pedagogy for mastering scale bridging\, some examples from the Energ y and Materials group at the Toyota Research Institute will be discussed as a proxy for such a pedagogy.

    Bio:

    Abraham Anapolsky is a Senior Ma nager in the Energy and Materials Division at the Toyota Research Institute . Dr. Anapolsky received his B.S. in physics from San Francisco State Unive rsity\, and an M.S. and Ph.D. from the University of California. Dr. Anapol sky has three decades of experience in energy materials ranging from photov oltaics to batteries\, shape memory alloys\, magnetic materials and high en tropy alloys\; and numerous patents and publications in these areas.

    LAST-MODIFIED:20211109T153340Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211117T160000Z DTEND:20211117T171500Z DTSTAMP:20220808T214455Z UID:48vsar1h9d88qpg1tnbe3lik93@google.com CREATED:20210914T155724Z DESCRIPTION:Speaker: Martin Cordiner\, NASA - \;https://science/gsfc.nasa.gove/se d/bio/martin.cordiner

    Title: Revealing the Chemistry of Comets a t Radio/Sub-mm Wavelengths

    Abstract: Comets are astrochemical fossil s of our Solar System\, containing frozen remnants
    from the epoch of pla net formation. As they heat up during brief passages through
    the inner S olar System\, remote and in situ measurements of their sublimated
    atmosp heres (comae)\, reveal the composition of the protosolar accretion disk at< br>the epoch of planet formation\, 4.5 billion years ago. Observations of t he newly
    discovered class of interstellar objects allows us\, for the fi rst time\, to directly
    measure (and test theories for) the chemistry of planet formation around other
    stars in the Galaxy. Thus\, comets bring t o our celestial doorstep a unique and
    powerful opportunity to better und erstand our astrochemical origins\, as well as to
    test our knowledge of low-temperature\, solid-state and gas-phase chemistry. In
    this seminar\, I will review ground-based spectroscopic observations of comets at
    radi o and sub-mm wavelengths\, and present some highlights of my recent
    rese arch in this area\, focusing on the composition of interstellar object 2I/B orisov
    and the chemically peculiar comet R2/PanSTARRS. LAST-MODIFIED:20211109T151127Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211122T200000Z DTEND:20211122T213000Z DTSTAMP:20220808T214455Z UID:3o2u8eu40kaj1is3q66agg1sdj@google.com CREATED:20211108T163338Z DESCRIPTION:Speaker: Christophe Grojean\, DESY\n\nTitle: “The BSM orders of CPV”\n\nAbstract: As SMEFT is a framework of growing importance to analyze high-energy data\, understanding its parameter space is crucial. The latte r is commonly split in CP-even and CP-odd parts\, but this classification i s obscured by the fact that CP-violation is actually a collective effect th at is best captured by considering flavor-invariant combinations of La- gra ngian parameters. I’ll present the 699 flavour invariants that describe CP violation effects in leading order in the SM effective field theory\, showi ng in particular that the breaking of CP is accidentally small in the SM. LAST-MODIFIED:20211108T163338Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211110T203000Z DTEND:20211110T213000Z DTSTAMP:20220808T214455Z UID:6d1jo3uj9jedqcmaolmjp33vk8@google.com CREATED:20211105T133127Z DESCRIPTION:Speaker Name: Prof. David A. Bader

    Speaker Institution : New Jersey Institute of Technology

    Title : The International Race t o Exascale Supercomputing

    Abstract : Supercomputing has become an es sential tool for computational science and engineering and such real-world problems as weather prediction\, jet design\, molecular dynamics\, and medi cal imaging. Such systems also provide unique capabilities for nation-scale intelligence and surveillance. The first terascale and petascale supercomp uters were built by Intel and IBM\, respectively\, at US Department of Ener gy Labs. Today's fastest supercomputer\, Fugaku\, is located at Japan's RIK EN Center for Computational Science. Several nations now are in a race to b uild the world's first exascale supercomputer that will perform an astoundi ng 10^18 floating point operations per second. Will the United States maint ain its high-performance computing leadership\, or are we slipping in our n ational strategy and investments? Where are our competitors such as China\, Russia\, Iran\, and Europe in their plans to launch an exascale supercompu ter. Will China beat the United States and dominate the field of HPC? In th is talk\, Bader will give an overview of the international race to exascale supercomputing by the leading countries and regions\, and provide some ins ights into competing strategies.


    Notes: Join from the meeting li nk

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    Meeting number (access code): 2630 537 3638

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    Host Name: Kim Pinckney-Lewis
    Hos t E-Mail: \;kimpl@lps.umd.edu LAST-MODIFIED:20211105T133127Z LOCATION:Virtual Meeting: https://lpscp.webex.com/lpscp/j.php?MTID=mbd641a 88554d302b60572c92f9abbd29 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Colloquium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211111T160000Z DTEND:20211111T173000Z DTSTAMP:20220808T214455Z UID:2uqgoalqtg3tpc970daatsjf6q@google.com CREATED:20210901T143150Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoom.u s/j/99485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min so cial hour at 11am with the seminar at 11:30am

    Speaker: Kostas Orgino s\, William &\; Mary

    Title: Non-pertrubative studies of parton di stribution functions


    Abstract: Parton distribution functions (PD Fs) encode the non-perturbative structure of hadrons and their knowledge is essential for our ability to predict experimentally measured cross section s. They play an important role in discovering new physics at high energy co llider experiments as well as in our understanding of the internal structur e of hadrons. However\, up until recently\, PDFs could only be determined f rom experimental data while first principles theoretical computations were limited to a few of their Melin moments. Novel ideas that came along have o pened new avenues for ab initio parton distribution function computations. In this talk\, I am presenting some of the lattice QCD methods employed in PDF studies and review recent numerical results from the W&\;M/JLab coll arbration (HadStruc). \; LAST-MODIFIED:20211105T131604Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211112T170000Z DTEND:20211112T174500Z DTSTAMP:20220808T214455Z UID:2qebpqhmnef3m65149hauflv8a@google.com CREATED:20211104T173859Z DESCRIPTION:Title: Anomalous subdiffusion in quantum chains\nSpeaker: Bra yden Ware (QuICS)\nTime: Friday\, November 12\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207\n\nIn typ ical quantum systems with conservation laws\, the approach to equilibrium a t finite temperature is governed by classical hydrodynamics in which charge and energy diffuse. In this talk\, I will discuss some one dimensional qua ntum systems with anomalous hydrodynamic behavior — that is\, systems where diffusion of charge is replaced by subdiffusion or superdiffusion. These s ystems evade the conventional description by being close to integrable poin ts with enhanced symmetries — nonetheless\, recent experiments on similar s ystems have shown that the behavior can be probed with cold atom experiment s.\n\nPizza and drinks served after the talk. LAST-MODIFIED:20211104T173859Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Brayden Ware TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211104T150000Z DTEND:20211104T163000Z DTSTAMP:20220808T214455Z UID:2r4mc1fggbqpnk2eae646kpse4@google.com CREATED:20210831T190248Z DESCRIPTION:Seminar will be conducted via zoom: \;https://umd.zoom.u s/j/99485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min so cial hour at 11am with the seminar at 11:30am

    Speaker: Zohongbo Kang \, UCLA

    Title: Quantum 3D imaging of hadrons

    Abstract:
    The transverse momentum dependent (TMD) parton distribution functions (PDFs) a nd fragmentation functions (FFs) have received great attention from both th eoretical and experimental communities in recent years. These TMD PDFs and FFs\, or in short called TMDs\, provide new information on hadron structure : the three-dimensional (3D) imaging of hadrons in both longitudinal and tr ansverse momentum space\, which is also one of the scientific pillars for t he future Electron Ion Collider. In this talk\, I will review the recent pr ogress in the study of the TMDs. That includes the study in the traditional processes such as semi-inclusive deep inelastic scattering\, Drell-Yan pro duction\, and e+e- collisions\, as well as some recent excitement in utiliz ing jets for 3D imaging. Our toolbox includes new developments such as jet charge for flavor separation\, polarized jet fragmentation functions\, etc.  \; LAST-MODIFIED:20211104T151258Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211111T190000Z DTEND:20211111T200000Z DTSTAMP:20220808T214455Z UID:4eb90bl3babi61t8s7of9ohmf1@google.com CREATED:20211103T180902Z DESCRIPTION:Title: Noncommutative Nullstellensatz and Perfect Games\nPrima ry tabs\nSpeaker: Adam Bene Watts (University of Waterloo)\nTime: Thursda y\, November 11\, 2021 - 2:00pm\nLocation: Virtual Via Zoom: https://uwate rloo.zoom.us/j/94137757747?pwd=S3ZvS2s2OFQwUEJwOGY1cVBlMDNOUT09\n\nThe foun dations of classical Algebraic Geometry and Real Algebraic Geometry are the Nullstellensatz and Positivstellensatz. Over the last two decades the bas ic analogous theorems for matrix and operator theory (noncommutative variab les) have emerged. In this talk I'll discuss commuting operator strategies for nonlocal games\, recall NC Nullstellensatz which are helpful\, and the n apply them to a very broad collection of nonlocal games.\nThe main result s of this procedure will be two characterizations\, based on Nullstellensat z\, which apply to games with perfect commuting operator strategies. The fi rst applies to all games and reduces the question of whether or not a game has a perfect commuting operator strategy to a question involving left idea ls and sums of squares. The second characterization is based on a new Nulls tellensatz. It applies to a class of games we call torically determined gam es\, special cases of which are XOR and linear system games. For these game s we show the question of whether or not a game has a perfect commuting ope rator strategy reduces to instances of the subgroup membership problem. Tim e permitting\, I'll also discuss how to recover some standard characterizat ions of perfect commuting operator strategies\, such as the synchronous and linear systems games characterizations\, from the Nullstellensatz formalis m.\n\nThis talk is based on joint work with John William Helton and Igor Kl ep. arXiv link to appear soon. LAST-MODIFIED:20211103T180902Z LOCATION:Virtual Via Zoom: https://uwaterloo.zoom.us/j/94137757747?pwd=S3Zv S2s2OFQwUEJwOGY1cVBlMDNOUT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Adam Bene Watts TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211110T160000Z DTEND:20211110T171500Z DTSTAMP:20220808T214455Z UID:7kdrbhr87tvhimruc8421hode8@google.com CREATED:20211103T175829Z DESCRIPTION:Title: Grand unification of quantum algorithms\nSpeaker: Isaa c Chuang (MIT)\nTime: Wednesday\, November 10\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/93033383715?pwd=NlBmKzF2cGdHa205UW ptQXIxU3JvZz09\n\nModern quantum algorithms originate historically from thr ee disparate origins: simulation\, search\, and factoring. Today\, we can now understand and appreciate all of these as being instances of a single f ramework\, and remarkably\, the essence is how the rotations of a single qu antum bit can be transformed non-linearly by a simple sequence of operation s. On the face of it\, this is physically non-intuitive\, because quantum mechanics is linear. The key is to think not about eigenvalues and closed systems\, but instead\, about singular values and subsystem dynamics.\n\nJo in Zoom Meeting\nhttps://umd.zoom.us/j/93033383715?pwd=NlBmKzF2cGdHa205UWpt QXIxU3JvZz09\nMeeting ID: 930 3338 3715\nPasscode: 849837\nOne tap mobile\n +13017158592\,\,93033383715#\,\,\,\,*849837# US (Washington DC)\n+192943628 66\,\,93033383715#\,\,\,\,*849837# US (New York)\nDial by your location\n +1 301 715 8592 US (Washington DC)\n +1 929 436 2866 US (New Y ork)\n +1 312 626 6799 US (Chicago)\n +1 253 215 8782 US (Tac oma)\n +1 346 248 7799 US (Houston)\n +1 669 900 6833 US (San Jose)\nMeeting ID: 930 3338 3715\nPasscode: 849837\nFind your local number : https://umd.zoom.us/u/arJfzed0B\nJoin by SIP\n93033383715@zoomcrc.com\nJo in by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114.131. 7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amsterda m Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sydney )\n103.122.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\n64.211 .144.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toronto)\ n65.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.137.2 4.110 (Japan Osaka)\nMeeting ID: 930 3338 3715\nPasscode: 849837 LAST-MODIFIED:20211103T175829Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/93033383715?pwd=NlBmKzF2cG dHa205UWptQXIxU3JvZz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Isaac Chuang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211118T190000Z DTEND:20211118T200000Z DTSTAMP:20220808T214455Z UID:2rr0sa3o5l1q2raroho0ftgasu@google.com CREATED:20211103T173906Z DESCRIPTION:Title: Quantum Physical Unclonable Functions and Their Compreh ensive Cryptanalysis\nSpeaker: Mina Doosti (University of Edinburgh)\nTime : Thursday\, November 18\, 2021 - 2:00pm\nLocation: Virtual Via Zoom: htt ps://umd.zoom.us/j/97616215362\n\nA Physical Unclonable Function (PUF) is a device with unique behaviour that is hard to clone due to the imperfection s and natural randomness during the manufacturing procedure\, hence providi ng a secure fingerprint. A variety of PUF structures and PUF-based applicat ions have been explored theoretically as well as being implemented in pract ical settings. Recently\, the inherent unclonability of quantum states has been exploited to derive the quantum analogue of PUF as well as new proposa ls for the implementation of PUF. Nevertheless\, the proper mathematical mo del and security framework for their study was missing from the literature. In this talk\, I will present our work on the first comprehensive study of quantum Physical Unclonable Functions (qPUFs) with quantum cryptographic t ools. First\, I introduce the formal definition and framework of qPUF captu ring the quantum analogue of all the requirements of classical PUFs. Then\, I introduce a new quantum attack technique based on the universal quantum emulator algorithm of Marvin and Lloyd that we have used to explore the vul nerabilities of quantum and certain classical PUFs leading to general no-go results on the unforgeability of qPUFs. On the other hand\, we prove that a large family of qPUFs (called unitary PUFs) can provide quantum selective unforgeability which is the desired level of security for most PUF-based a pplications. Moreover\, I elaborate on the connection between qPUFs as hard ware assumptions\, and computational assumptions such as quantum pseudorand omness in order to establish the link between these two relatively new fiel ds of research. LAST-MODIFIED:20211103T173906Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/97616215362 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Mina Doosti TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211104T200000Z DTEND:20211104T213000Z DTSTAMP:20220808T214455Z UID:76ev7inn2m79ml41pqbl7ggtf9@google.com CREATED:20211103T173430Z DESCRIPTION:Title : "A Ghost Hunt: Search for Dark Matter via Ground-based Experiments"

    Speaker Name: Prof. Shin-Shan Yu
    Speaker Institution : University of Maryland

    Name: Sally Megonigal
    E-Mail: \;smegonig@umd.edu LAST-MODIFIED:20211103T173430Z LOCATION:PSC Room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211112T180000Z DTEND:20211112T190000Z DTSTAMP:20220808T214455Z UID:3kl9ngbbitpio91fuevgous6h2@google.com CREATED:20210914T150950Z DESCRIPTION:Speaker: Turon Birol\, Assistant Professor\, Chemical Engineeri ng &\; Materials Science\, University of Minnesota

    Title: Turon B irol\, Assistant Professor\, Chemical Engineering &\; Materials Science \, University of Minnesota

    Abstract: First principles computational methods provide a reliable means to both reproduce and predict the properti es of crystalline materials. These approaches can also be used to perform t hought experiments to elucidate the microscopic mechanisms of macroscopic p henomena\, build structure-property relationships\, and design new material s with desired properties. In this talk\, Dr. Birol is going to present res ults from his recent work on a wide range of emergent phenomena including c harge density wave transitions\, metallic "ferroelectricity\," and transpar ent correlated metals. He will also discuss the capabilities and shortcomin gs of three theoretical tools we use most often: Density Functional Theory (DFT)\, which is the workhorse of first principles calculations of crystall ine materials\; Dynamical Mean Field Theory (DMFT)\, which has recently eme rged as a means to perform correlated materials design\; and group and repr esentation theories\, which provide a systematic way to approach the symmet ry related properties of materials.

    Bio:

    Turan Birol received his BS and PhD in Physics from the Middle East Technical University and Cornell University respectively. Prior to joining the University of Minnesota depa rtment of Chemical Engineering and Materials Science as an assistant profes sor in 2016\, he was a postdoctoral associate in Rutgers University condens ed matter theory group. He has recently received the National Science Found ation CAREER award\, the Office of Naval Research young investigator award\ , and the University of Minnesota McKnight Land-Grant Professorship. Birol' s research interests lie on the intersection of materials science\, condens ed matter physics\, and physical chemistry\; and his research program aims to elucidate the connection and couplings between the crystal structure and electronic properties of quantum materials. \;

    LAST-MODIFIED:20211103T151109Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211110T160000Z DTEND:20211110T171500Z DTSTAMP:20220808T214455Z UID:4c4mcnme60cqmf885u5kb1vcs1@google.com CREATED:20210914T155520Z DESCRIPTION:Speaker: Sara Mason\, University of Iowa - \;https://masongroup.lab.uiowa.edu/

    Title: Metal Release from Complex Oxides Studied through Compositional Tuni ng\, Theory\, and Experiment

    Abstract: \;Nanoscale complex metal oxides have transformed how technology is used worldwide. The most widespr ead examples are the electroactive components of Li-ion batteries found in portable electronic devices. As the number of portable devices is projected to increase\, so too will the inadvertent release of complex metal oxide n anomaterials into the environment. This is a pressing problem because the e nvironmental and biological impact of complex metal oxide nanomaterials are most times unknown\, since they are subject to transform rapidly with chan ges in pH and concentration. This brings us to a looming problem that needs to be solved on a global scale. There is a fundamental knowledge gap in de veloping sustainable nanotechnology because there is not yet a systematic m ethod to predict how the properties of a complex metal oxide will change wi th changes in chemical environment. We have developed an approach which com bines DFT-computed total energies and tabulated data to compute the energy cation release of complex metal oxides. We focus on the materials found in a Li-ion battery cathode\, namely LiCoO2 \;(LCO) and composi tionally tuned variants that go on to include nickel and manganese. We find that adjusting surface terminations\, compositions and pH will change the dissolution properties of this family of materials\, and ultimately lead to increased favorability of metal release. We generate a new set of material s where we have replaced Ni\, Co\, and Mn with metals that will keep the sa me functionality while reducing biological impact. We then predict the ther modynamics of metal release to give insight on tailorable properties that c an be used to formulate sustainable design principles for future generation s of functional complex metal oxide materials.

    Zoom link: \;http://go.umd.edu/pchem_semin ars LAST-MODIFIED:20211103T145847Z LOCATION:In person\, IPST Bldg. #085\, 1116 Conference Room and Zoom link b elow. SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211110T210000Z DTEND:20211110T223000Z DTSTAMP:20220808T214455Z UID:63a35j9ouimi3diqbci1j6sl99@google.com CREATED:20211103T140122Z DESCRIPTION:Title : "Improving LIGO Searches using Data Quality Information "

    Speaker Name: Max Trevor
    Speaker Institution : University of Ma ryland

    Name: Sally Megonigal
    E-Mail: \;smegonig@umd.edu LAST-MODIFIED:20211103T140122Z LOCATION:PSC Room 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211115T213000Z DTEND:20211115T223000Z DTSTAMP:20220808T214455Z UID:4o5o1r60po41kbjb0hro59qihb@google.com CREATED:20211102T073612Z DESCRIPTION:Title: Cosmic Rays at Heliospheric Extremes: Recent Measurement s by Voyager and Parker Solar Probe\n\nSpeaker: Jamie S. Rankin\, Princeton University\n\nAbstract: In 2012\, during the centennial year of the discov ery of cosmic rays\, Voyager 1 crossed the heliopause and began making the very first in-situ observations of the surrounding interstellar medium. Joi ned by Voyager 2 in 2018\, these twin spacecraft continue to provide critic al measurements of cosmic rays in a surprising\, previously-unexplored plas ma regime. Meanwhile\, in 2018\, Parker Solar Probe made history by explori ng another new regime\, venturing closer to the Sun than any spacecraft bef ore it. This talk will highlight the new insights\, discoveries\, and open questions that have arisen from in-situ measurements of low-energy cosmic r ays (few to hundreds of MeV) at these two extremes and how they relate to t he current understanding of our own global astrosphere.\n\nNotes: Join the meeting at 4:15 for meet and greet LAST-MODIFIED:20211102T073643Z LOCATION:Location: Online via Zoom\, visit https://bit.ly/2PmJoT6 for acces s SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211103T193000Z DTEND:20211103T203000Z DTSTAMP:20220808T214455Z UID:5ghbqtua0l5v62jaqt5qvn0phq@google.com CREATED:20211101T182915Z DESCRIPTION:Title : Quantum reference frames for indefinite metrics: fallin g through masses in superposition

    Speaker Name: Prof. Časlav Brukner
    Speaker Institution : University of Vienna

    Abstract : The curren t theories of quantum physics and general relativity alone do not allow us to study situations where the gravitational source is a quantum. In particu lar\, it is still unclear what the gravitational field sourced by mass conf iguration in a spatial superposition looks like and how other objects move in its vicinity. In my talk\, I will propose a strategy that allows us to a ddress this question using quantum reference frames (QRF). In particular\, I will show that in a typical situation it is possible to change to a QRF i n which the mass configuration is definite\, and apply standard quantum mec hanics on a fixed spacetime background to determine the evolution of test p articles in the presence of this fixed gravitational source. By applying th e inverse QRF transformation to the time-evolved state\, we find the trajec tory of the test particles in the original frame where the mass configurati on is in superposition. Our results may pave a fruitful path to establishin g conceptual grounds for a future theory of quantum gravity.

    Host Na me: Kim Nakia Pinckney-Lewis
    Host E-Mail: \;kimpl@lps.umd.edu LAST-MODIFIED:20211101T182915Z LOCATION:Laboratory for Physical Sciences via WebEx\; contact host SEQUENCE:0 STATUS:CONFIRMED SUMMARY:LPS Colloquia / Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211108T200000Z DTEND:20211108T213000Z DTSTAMP:20220808T214455Z UID:5qp4b35rvj2ot2gee7on9a8k9v@google.com CREATED:20210811T152022Z DESCRIPTION:Speaker: Itay Bloch\, Tel Aviv University\n\nTitle: The NASDUCK collaboration: using quantum magnetometers to look for ultralight dark mat ter\n\n\nAbstract: When DM bosons have an ultra-light mass\, they can act a s a classical\, coherent field. In many cases\, and specifically in some AL P models\, this field has magnetic properties\, and it can therefore be mea sured by quantum magnetometers. The Noble and Alkali Spin Detectors for Ult ralight Coherent darK matter (NASDUCK) collaboration\, was formed last year in order to measure such DM. Recently\, the collaboration released its fir st results from the "NASDUCK-Floquet" experiment\, which looks for DM rough ly in the femto to pico eV mass range. The new experiment places the most s tringent terrestrial constraints to date on ultra-light axion-like particle s coupled to neutrons. The constraints are comparable to those from stellar cooling\, providing a complementary probe. In my talk I will discuss the t heory behind the NASDUCK-Floquet experiment. I will also discuss future pro spects of the NASDUCK collaboration\, and some of our planned experiments. LAST-MODIFIED:20211101T165919Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211101T190000Z DTEND:20211101T203000Z DTSTAMP:20220808T214455Z UID:00rrqfjjnesd757tn32jnjd2a0@google.com CREATED:20210913T140450Z DESCRIPTION:Seminar will be conducted via zoom.

    Speaker: Haipeng An\ , Tsinghua University

    Title: Gravitational waves from first-order ph ase transition during inflation

    Abstract: During the inflation era\, the properties (such as mass and interactions) of the fields coupled to th e inflaton field may change substantially. As a result\, drastic phenomena\ , such as first order phase transitions\, may happen. In this talk\, I will present simple models that first-order phase transition can happen and fin ish during inflation. I will discuss the properties of the gravitational wa ve (GW) signals produced by first-order phase transitions during inflation. I will show that there is a unique oscillatory feature in the GW spectrum. I will also show that we may be able to observe directly such a signal thr ough future terrestrial or spatial GW detectors.

    For zoom link pleas e email mknouse@umd.edu LAST-MODIFIED:20211029T135303Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211104T190000Z DTEND:20211104T200000Z DTSTAMP:20220808T214455Z UID:377dc4tco6gi1goc8v9u1up4uq@google.com CREATED:20211025T175224Z DESCRIPTION:Title : "A Ghost Hunt: Search for Dark Matter via Ground-based Experiments"

    Speaker Name: Prof. Shin-Shan Yu
    Speaker Institution : National Central University (Taiwan)

    Abstract : I will present tw o complementary thrusts towards a search for dark matter. I shall start wit h a search via the mono-h(bb) channel using the 2016 data collected by the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). The mono-h(bb) signal is characterized by a Higgs boson\, decaying to a bot tom quark-antiquark pair\, recoiling against large missing transverse momen tum.
    Novel analysis techniques are exploited and the results are interpr eted in terms of limits on parameters of various mono-h models. I will then introduce a newly established experiment -- the Taiwan Axion Search Experi ment with Haloscope (TASEH)\, aiming to look for axions with a mass of abou t 20 μeV\; I will show the current status of TASEH and present its outlook.


    Name: Sally Megonigal
    E-Mail: \;smegonig@umd.edu LAST-MODIFIED:20211029T131548Z LOCATION:PSC Room 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211105T160000Z DTEND:20211105T164500Z DTSTAMP:20220808T214455Z UID:6eo6cur0tccr2s9acf9cksfspq@google.com CREATED:20211028T225028Z DESCRIPTION:Title: The Most Coherent Superconducting Qubit?\nSpeaker: Aar on Somoroff (JQI)\nTime: Friday\, November 5\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207\n\nTo real ize a digital quantum processor based on superconducting qubits\, gate erro r rates must be further reduced by raising coherence times and increasing a nharmonicity. I report our group's progress in improving coherence and cont rol of fluxonium superconducting qubits by optimizing the circuit's spectru m and enhancing fabrication methods. I demonstrate a device with coherence time T2 exceeding 1 millisecond and an average single-qubit gate fidelity g reater than 99.99% [1]. To our knowledge\, these are the highest coherence times and gate fidelities observed in a solid-state qubit to date. The coh erence time is still limited by dielectric loss and can be improved by furt her mitigating material losses. The high gate fidelity is readily achievabl e due to the strong anharmonicity inherent to fluxonium's spectrum. Finally \, I will present our recent work on scaling up from the single-qubit level to demonstrating two-qubit gates with capacitively coupled fluxonium circu its [2]. \n\nReferences: [1] A. Somoroff et al. arXiv:2103.08578 (2021) [2] Q. Ficheux et al. Phys. Rev. X 11\, 021026 (2021)\n\nPizza and drinks serv ed after the talk. LAST-MODIFIED:20211028T225028Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Aaron Somoroff TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211102T170000Z DTEND:20211102T181500Z DTSTAMP:20220808T214455Z UID:1gf2lkjsdim1aehrb94u7612il@google.com CREATED:20210913T183640Z DESCRIPTION:Speaker: Armita Nourmohammad\, University of Washington

    Title: \;Adaptive Immunity in Light of Host-Pathogen Coevolution

    Abstract: \;The adaptive immune system consists of highly diverse B an d T cells whose unique surfacereceptors enables them to mount specific resp onses against a multitude of pathogens. Adaptive immunity incorporates all aspects of life\, from molecular signaling to cellular evolution. The resul t is an information processing molecular organization with many interacting components\, which can reliably sense and adaptively respond to diverse an d evolving pathogens. With the growing amount of molecular data\, we can no w quantify the sequence diversity generated in immune repertoires. However\ , we still lack an understanding of how such diversity translates to immune function. In this talk\, I will introduce a principled statistical framewo rk to integrate interpretable biophysical models of immune receptor generat ion with flexible and powerful deep learning approaches to characterize seq uence determinants of immune receptor function. Apart from these data-drive n approaches\, I will establish a theoretical framework to characterize the organization and encoding of information in the adaptive immune system to counter the out of equilibrium evolutionary drive that a host experiences f rom pathogens. These approaches will shed light on how the diversity of imm une repertoires shape functional responses to ever- changing pathogenic env ironments.

    When: \;1:15pm (An informal pre-seminar cha t with the speaker\, to which all are invited\, will be held at 1:00pm).

    Where: \;https://go. umd.edu/statphys_zoom

    LAST-MODIFIED:20211028T193534Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Virtual Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211103T150000Z DTEND:20211103T161500Z DTSTAMP:20220808T214455Z UID:59cht3ol9chdvtpss4j5tdt4ju@google.com CREATED:20211028T160419Z DESCRIPTION:Title: Turbocharging quantum computing through active and pass ive error suppression\nSpeaker: Joseph Emerson (University of Waterloo)\nT ime: Wednesday\, November 3\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/99857134424\n\nIn this talk I will give an overview of various strategies we have developed for suppressing the inevitable erro rs occurring during quantum computations. These tools work at the gate leve l and thus can be effective even through a cloud API exposing only elementa ry gates to the end-user. I will demonstrate the effectiveness of these too ls with experimental results across multiple hardware architectures. LAST-MODIFIED:20211028T160419Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/99857134424 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Joseph Emerson TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211028T183000Z DTEND:20211028T200000Z DTSTAMP:20220808T214455Z UID:2mk1oil2h62e7k1aul7uvtvfor@google.com CREATED:20211027T173902Z DESCRIPTION:Speaker: Peizhi Du\, Stony Brook University\n\nTitle: New backg rounds and new ideas for sub-GeV dark matter direct detection\n\nAbstract: Probing sub-GeV dark matter requires designing low threshold detectors and understanding backgrounds. In this talk I will address these two issues. Fi rst\, we point out several unexplored low-energy backgrounds in sub-GeV dar k matter searches\, which arise from high-energy particles of cosmic or rad ioactive origin that interact with detector materials. In this talk\, I wil l focus on Cherenkov radiation and luminescence from electron-hole pair rec ombination. We demonstrate that these processes provide plausible explanati ons of the observed events at SENSEI and SuperCDMS HVeV. Second\, we propos e a new idea of probing light dark matter using doped semiconductors. Dopan ts in semiconductors form energy levels that are tens of meV below the cond uction band or above the valence band. These materials can be new detector targets for dark matter scattering with a threshold of tens of meV\, which can probe dark matter masses down to tens of keV.\n\nWill also be streamed via zoom\, for link please email mknouse@umd.edu LAST-MODIFIED:20211027T174526Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar *Special Seminar* TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211105T170000Z DTEND:20211105T180000Z DTSTAMP:20220808T214455Z UID:1ji3n1bvfhr0a7cohbeo8sdcns@google.com CREATED:20210914T150859Z DESCRIPTION:Speaker: Tim Atherton\, Associate Professor\, Physics &\; As tronomy\, Tufts University

    Title: TBA

    Abstract: \; https://as.tufts.edu/physics/people/faculty/atherton LAST-MODIFIED:20211026T165342Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211028T150000Z DTEND:20211028T163000Z DTSTAMP:20220808T214455Z UID:1u93n3uv051fbcc60lscrqk8io@google.com CREATED:20211026T151315Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/99 485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min social h our at 11am with the seminar at 11:30am

    Speaker: Christina Aidala\, University of Michigan


    Title: Studying Hadronization at LHCb


    Abstract: A key question in quantum chromodynamics (QCD) is how to relate the quark and gluon degrees of freedom of QCD to the hadrons we can observe in nature. A great deal of effort over more than half a century ha s been dedicated to understanding and describing hadron structure\, in part icular proton structure\, in terms of partonic constituents. Much less att ention has been focused thus far on the inherently dynamical process of had ron formation from colored degrees of freedom. The LHCb experiment at CERN \, with its outstanding hadron identification capabilities\, offers unprece dented opportunities to study hadronization in a high-energy hadronic colli sion environment. Current results and future prospects will be discussed. LAST-MODIFIED:20211026T151315Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211109T160000Z DTEND:20211109T170000Z DTSTAMP:20220808T214455Z UID:613cm7n8drq714pf531c3uacq9@google.com CREATED:20211025T165505Z DESCRIPTION:Speaker: Kyle Kawagoe (University of Chicago)
    Loca tion: Zoom
    Title: A Bulk-Boundary Correspondence for 2D Fermi onic Symmetry Protected Topological Phases
    Abstract: A universal property of symmetry protected topological (SPT) phases is that they have l ow energy boundary modes that are protected under the symmetry. This fact i nspires an important problem in the theory of SPT phases: How does one iden tify a bulk SPT phase given a low energy theory of its boundary? This quest ion is particularly challenging in the case of interacting SPT phases where band theory approaches are inapplicable. In this talk\, we present a gener al method for solving this problem in the case of (2+1) D interacting fermi onic systems with internal (non-spatial) symmetries.
    Host: Yu-An Chen

    Email emartin3@umd.edu for Zoom details LAST-MODIFIED:20211025T165505Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Informal Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211027T150000Z DTEND:20211027T161500Z DTSTAMP:20220808T214455Z UID:1qcu8fju3hdvttumit34fvhh9g@google.com CREATED:20211024T011337Z DESCRIPTION:Title: Training Variational Quantum Algorithms Is NP-Hard\nSpe aker: Martin Kliesch (University of Düsseldorf)\nTime: Wednesday\, Octobe r 27\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/9 6652547990\n\nVariational quantum algorithms are proposed to solve relevant computational problems on near term quantum devices. Popular versions are variational quantum eigensolvers and quantum approximate optimization algor ithms that solve ground state problems from quantum chemistry and binary op timization problems\, respectively. They are based on the idea of using a c lassical computer to train a parametrized quantum circuit. We show that the corresponding classical optimization problems are NP-hard. Moreover\, the hardness is robust in the sense that\, for every polynomial time algorithm\ , there are instances for which the relative error resulting from the class ical optimization problem can be arbitrarily large assuming that P≠NP. Even for classically tractable systems composed of only logarithmically many qu bits or free fermions\, we show the optimization to be NP-hard. This elucid ates that the classical optimization is intrinsically hard and does not mer ely inherit the hardness from the ground state problem. Our analysis shows that the training landscape can have many far from optimal persistent local minima. This means that gradient and higher order descent algorithms will generally converge to far from optimal solutions LAST-MODIFIED:20211024T011337Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/96652547990 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Martin Kliesch TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211026T140000Z DTEND:20211026T153000Z DTSTAMP:20220808T214455Z UID:53hn74qavs6mgkggdtni9m0575@google.com CREATED:20211022T161515Z DESCRIPTION:Speaker Name: Prof. Shin-Shan Yu
    Speaker Institution : Natio nal Central University (Taiwan)

    Title : "A Ghost Hunt: Search for Da rk Matter via Ground-based Experiments" \;

    Abstract : I will pre sent two complementary thrusts towards a search for dark matter. I shall st art with a search via the mono-h(bb) channel using the 2016 data collected by the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). The mono-h(bb) signal is characterized by a Higgs boson\, decaying t o a bottom quark-antiquark pair\, recoiling against large missing transvers e momentum. Novel analysis techniques are exploited and the results are
    interpreted in terms of limits on parameters of various mono-h models. I wi ll then introduce a newly established experiment -- the Taiwan Axion Search Experiment with Haloscope (TASEH)\, aiming to
    look for axions with a ma ss of about 20 μeV\; I will show the current status of TASEH and present it s outlook.

    Host Name: Sally Megonigal
    Host E-Mail: \;smegonig@umd.edu LAST-MODIFIED:20211022T161515Z LOCATION:PSC RM 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211029T160000Z DTEND:20211029T164500Z DTSTAMP:20220808T214455Z UID:28218itf916kicmglh8q4a7c1l@google.com CREATED:20211021T163534Z DESCRIPTION:Title:  Large-N solvable models of measurement-induced critical ity
    Speaker:  Subhayan Sahu (University of Maryland\, Physics)
    Time:  Friday\, October 29\, 2021 - 12:00pm
    Location:  ATL 2324 and Virtual Vi a Zoom: https:/ /umd.zoom.us/j/99484119207

    Competition between unitary dynamics that scrambles quantum information non-locally and local measurements that probe and collapse the quantum state can result in a measurement-induced en tanglement phase transition. Here we introduce analytically tractable model s of measurement-induced criticality in large-N Brownian hybrid circuit mod el composed of qubits [1]. The system is initially entangled with an equal sized reference\, and the subsequent hybrid system dynamics either partiall y preserves or totally destroys this entanglement depending on the measurem ent rate. Our approach can access a variety of entropic observables\, which are represented as a path integral coupling four replicas with twisted bou ndary conditions. Saddle-point analysis reveals a second-order phase transi tion corresponding to replica permutation symmetry breaking below a critica l measurement rate. The transition is mean-field-like and we characterize t he critical properties near the transition in terms of a simple Ising field theory in 0+1 dimensions. We also extend these solvable models to study th e effects of power-law long-range couplings on measurement-induced phases. In one dimension\, the long-range coupling is irrelevant for α>\;3/2\, wi th α being the power-law exponent. For α<\;3/2 the long-range coupling be comes relevant\, leading to a nontrivial dynamical exponent at the measurem ent-induced phase transition. More interestingly\, for α<\;1 the entangle ment pattern receives a sub-volume correction for both area-law and volume- law phases. The volume-law phase with such a sub-volume correction realizes a novel quantum error correcting code whose code distance scales as L^(2−2 α) [2].

    References: [1] Phys. Rev. B 104\, 094304 (2021)\, ArXiv:210 4.07688.\, [2] ArXiv:2109.00013.

    Pizza and drinks served after the t alk. LAST-MODIFIED:20211021T163534Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Subhayan Sahu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211027T193000Z DTEND:20211027T203000Z DTSTAMP:20220808T214455Z UID:3ve16trf88gesdkb30kf3p92l4@google.com CREATED:20211020T171922Z DESCRIPTION:Title : Applications of soliton theory to the study of 3D magne tic fields with nested flux surfaces

    Speaker Name: Wrick Sengupta
    Speaker Institution : Princeton University

    Abstract : The theory of solitons has been successfully applied in the past to understand various n onlinear plasma behavior. For example\, the time-dependent derivative nonli near Schrodinger equation (DNLS) describes solitons in weakly nonlinear\, l ong-wavelength\, one-dimensional\, compressible Hall-MHD. The steady-state MHD equilibrium with the isodynamic constraint (magnetic field strength is constant on the flux-surface) is described by the nonlinear Schrodinger equ ation (NLS). A connection with soliton theory can shed light on how singula r currents and island formation may be avoided in MHD. In this work\, we sh ow that the appearance of NLS-like soliton equations and their hierarchy of conserved quantities are ubiquitous in MHD equilibrium with flux surfaces. In particular\, we study three different classes of MHD equilibrium with:< br>i) a circular cross-section near an arbitrary closed 3D magnetic axis\,< br>ii) exact quasisymmetry near a planar flux-surface\,
    iii) quasisymmet ry close to isodynamic.
    In case i)\, we employ near-axis expansions and Hasimoto transformation to show that the rotational transform and its deriv atives are closely related to the NLS hierarchy of invariants.
    In case i i)\, we use near-surface expansion techniques to obtain a class of quasisym metric vacuum magnetic fields near a planar flux surface\, which is describ ed by a reflectionless potential.
    Finally\, in case iii)\, we study pert urbations of exact isodynamic MHD equilibrium that satisfy the quasisymmetr y constraint. Since exact isodynamic fields satisfy NLS\, we seek integrabl e deformations of NLS that allow quasisymmetry to be satisfied globally.
    This work was supported by the U.S.Department of Energy Grant No. DE-FG02- 86ER53223\, the Simons Foundation/SFARI (560651\, AB) and DoE Contract No D EAC02-09CH11466

    Host Name: Marc Swisdak
    Host E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20211020T171922Z LOCATION:Email swisdak@umd.edu for Zoom address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211027T150000Z DTEND:20211027T161500Z DTSTAMP:20220808T214455Z UID:0q9m1b946bos3m058mopne0f74@google.com CREATED:20210914T155024Z DESCRIPTION:Speaker: Jay Amicangelo\, Penn State Behrend - \;https://behrend.psu.e du/person/jay-charles-amicangelo

    Title: Characterization of Hydr ogenated Radicals Using Matrix Isolation Infrared Spectroscopy

    Abstr act: \;The matrix isolation spectroscopy technique is an experimental t echnique that wasdeveloped for the stabilization and spectral characterizat ion of transient species\,such as radicals\, molecular ions\, coordinativel y unsaturated species\, and weakintermolecular complexes. In this technique \, a transient species is generated\,trapped in a low temperature solid mat rix of inert material\, and thenspectroscopically interrogated. Generally\, the solid matrix is kept at temperaturesbelow 20 K\, which reduces the pos sibility of unimolecular decomposition\, andisolation in the solid matrix e nvironment reduces the occurrence of bimolecularreactions involving the tra nsient species. Solid matrix materials are typically raregases (Ne\, Ar\, K r\, Xe)\, but molecular gases such as N2 and H2 can also be used. Inthis ta lk\, I will describe two projects involving the reaction of hydrogen atoms withtwo different aromatic ring systems to produce mono-hydrogenated aromat icradicals (H· + R → RH·) and the characterization of the infrared spectra of theradicals using matrix isolation infrared spectroscopy. LAST-MODIFIED:20211020T143924Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211026T170000Z DTEND:20211026T180000Z DTSTAMP:20220808T214455Z UID:146cft1j1b2p09dfte62subirf@google.com CREATED:20210913T182234Z DESCRIPTION:Speaker: Professor Jan Sengers\, UMD

    Title: Mass and Thermodiffusion in Multicomponent Fluid Mixtures

    Abstr act: Mass diffusion and thermo-diffusion coefficients of multicomponent fluid mixtures depend on the representation used to specify the compositio n\, i.e.\, whether mass fractions\, mole fractions\, or volume fractions ar e used. Different authors have used different approaches which makes compar ison between experimental diffusion coefficients of multicomponent fluids d ifficult. This presentation will show how one can redefine mass and thermo- diffusion coefficients of multicomponent fluid mixtures so that they become independent of the frame of reference.

    This contribution to non-equ ilibrium thermodynamics is in memory of José María Ortiz de Zárate Leira. 1 \,2 1. J.M. Ortiz de Zárate\, Eur. Phys. J. E 42: 43 (2019).
    2. J.M. Ort iz de Zárate and J.V. Sengers\, Phys. Chem. Chem. Phys. 22\, 175976 (2020).


    LAST-MODIFIED:20211020T142318Z LOCATION:IPST Bldg. #085 1116 Conference Room SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211013T190000Z DTEND:20211013T203000Z DTSTAMP:20220808T214455Z UID:2tlm0a782ql8tl8af7d3lmgpsi@google.com CREATED:20211011T201635Z DESCRIPTION:Speaker: Alejandro Corichi\, Center for Mathematical Sciences\, National University of Mexico (UNAM)

    Title: Canonical analysis of g auge theories in regions with boundaries.

    Abstract: In this talk\, I shall outline a recent proposal for an extension of the Dirac algorithm fo r theories defined in regions with boundaries. While in many physical syste ms the strategy put forward by Regge-Teitelboim works well\, there are case s in which it is incomplete. Our proposal aims to fill this gap and have a generic method. We shall illustrate the formalism by considering a couple o f examples\, namely the Maxwell-Pontryagin theory in 4D\, and certain isola ted horizons in vacuum GR.

    Recording of Seminar can be viewed here: https://umd.z oom.us/rec/play/8TwY5SqdOmQ9Y9oPpHLgA_hWekDxE4kYd2y2Y0a8UusMQXs5fpaB-Mgsqd_ M4C8HG-T6KXppXEoMwkMI.AVvhXx6tVTTwTDl8

    Seminar is in person\, bu t will also be streamed via zoom: https://umd.zoom.us/j/99307158788 LAST-MODIFIED:20211018T133534Z LOCATION:PSC 3150 and Online SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211022T160000Z DTEND:20211022T164500Z DTSTAMP:20220808T214455Z UID:3so0u77hf92k156v12ullen7jo@google.com CREATED:20211016T004535Z DESCRIPTION:Speaker: Naren Manjunath (University of Maryland\, Physics)\nT ime: Friday\, October 22\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207\n\nThe integer quantum Hall st ates\, the quantum spin Hall insulator\, and the (2+1)D p-wave topological superconductor each have an important place in condensed matter physics due to their quantized symmetry-protected topological invariants. These system s have a unique ground state on any closed manifold in (2+1) dimensions\, a nd are examples of 'invertible' topological phases of fermions. Here I will describe a general theory which fully encodes the universal properties of such invertible phases\, and classifies them based on their symmetries. Thi s approach is 'categorical': it does not require solvable microscopic model s\, and is applicable to systems with arbitrarily strong interactions. Some new applications of the theory include an interacting version of the 'tenf old way' classification of topological insulators and superconductors\, and also the prediction of an interesting invertible phase which by our naïve intuition should not exist (but apparently does). \n\nReference: https://ar xiv.org/abs/2109.11039\n\nPizza and drinks served after the talk. LAST-MODIFIED:20211016T004535Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Naren Manjunath TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211020T150000Z DTEND:20211020T161500Z DTSTAMP:20220808T214455Z UID:4svjkp9h9hg5itk32kp8kig9tc@google.com CREATED:20211013T135016Z DESCRIPTION:Title: Nonequilibrium phases of matter on NISQ hardware
    Spe aker: Matteo Ippoliti (Stanford University)
    Time: Wednesday\, October 20\, 2021 - 11:00am
    Location: (In-person) ATL 3100A and Virtual Via Zoom : https://umd.zoom.us/j/2821742741?pwd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz 09

    Recent progress on noisy\, intermediate scale quantum (NISQ) devices opens exciting opportunities for many-body physics. NISQ platforms are indeed not just computers\, but also interesting laboratory systems in their own right\, offering access to large Hilbert spaces with exceptional capabilities for control and measurement. I will argue that nonequilibrium phases in periodically-driven (Floquet) systems are a particularly good fit for such capabilities in the near term. Focusing on the paradigmatic examp le of the "discrete time crystal" (DTC)\, I will review the idea of eigenst ate order\, wherein many-body localization allows the definition of phase s tructure away from thermal equilibrium. I will then discuss how an eigensta te-ordered DTC can be studied on NISQ hardware [1]\, and present recent exp erimental work in which these ideas are implemented on Google Quantum AI's superconducting qubit processor [2]\, giving a scalable blueprint for NISQ- era studies of nonequilibirum phases of matter.

    [1] MI\, K. Kechedzh i\, R. Moessner\, S. Sondhi\, V. Khemani\, PRX Quantum 2\, 030346 (2021)
    [2] X. Mi\, MI\, C. Quintana\, A. Greene et al. (Google Quantum AI and col laborators)\, arXiv:2107.13571 (2021) LAST-MODIFIED:20211015T235552Z LOCATION:(In-person) ATL 3100A and Virtual Via Zoom: https://umd.zoom.us/j /2821742741?pwd=SWJSRm1DTGFoYUtVMllVSEo5bzdmdz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Matteo Ippoliti TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211022T170000Z DTEND:20211022T180000Z DTSTAMP:20220808T214455Z UID:5cd9g50e9n6cmksapb3thiq9ja@google.com CREATED:20210914T150141Z DESCRIPTION:Speaker: Joseph Heremans\, Professor\, Materials Science &\; Engineering\, Ohio State University

    Title: Thermal and Thermoelectr ic of Topologically Non-Trivial Crystals

    Abstract: \; First\, an overview will be given of the Hereman group activities. They're focused on the fundamental research on thermal transport properties of electrons\, ph onons and magnons\, and on the use of these properties in all-solid-state t hermal energy conversion. Recent focus is on properties that are affected b y topological properties of the Fermi surface in goniopolar materials (Natu re Materials\, \;ht tps://doi.org/10.1038/s41563-019-0309-4) and in Weyl semimetals (Nature Materials\, https://doi.org/10.1038/s41563-021-00983-8). \;

    Second\, a more in-depth view will be given of a new mechanism for heat transport i n Weyl semimetals (WSMs). These are solids with a bulk band structure consi sting of pairs of chirally distinct linear Dirac bands that intersect at th e Weyl points. Thermal transport in WSMs in the extreme quantum limit of ma gnetic fields show the thermal version of the chiral anomaly. This is an ad ditional thermal conductivity that results from the generation of energy by carriers of one chirality and the annihilation of the energy by carriers o f the other. The effect is shown experimentally on single-crystal Bi1- xSbx \;alloys (x=11 and 15 at.%). It dominates the the rmal conductivity at 9 T\, where it increases the electronic thermal conduc tivity by 300%. The thermal chiral anomaly is related to the electrical one \, which is due to the creation and generation of electron numbers\, by the Wiedemann-Franz law with a Lorenz ratio of p2/3 (kB/e)2 \;where p2/3 is now a topological in variant\, unlike in the classical free electron case. This very large effec t extends to over 200 K and could be useful in designing heat switches usef ul\, for example\, in adiabatic demagnetization refrigeration.

    Bio:

    Heremans is an Ohio Eminent Scholar and Professor in the Mechanical an d Aerospace Engineering Department at the Ohio State University\, with appo intments in the Materials Science and Engineering Department and the Depart ment of Physics. He is a member of the National Academy of Engineering\, an d a fellow of AAAS and the American Physical Society. He joined OSU after a 21-year career at the General Motors and later Delphi Research Laboratorie s. \; His research interests focus on experimental measurements of tran sport properties\, energy conservation and recovery. \; In the last dec ade\, he worked on the transport of heat\, charge\, and spin in solids.

    LAST-MODIFIED:20211014T142227Z LOCATION:CHE 2110 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211020T150000Z DTEND:20211020T161500Z DTSTAMP:20220808T214455Z UID:5nqchu2eaervnhalpku3oong8o@google.com CREATED:20210914T154756Z DESCRIPTION: LAST-MODIFIED:20211014T134440Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - SEMINAR CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211022T173000Z DTEND:20211022T183000Z DTSTAMP:20220808T214455Z UID:5tfg5cgj258pm0s813n2l4oct8@google.com CREATED:20210816T143337Z DESCRIPTION:**Joint Cornell/ UMD Seminar**

    Speaker: Gian Giud ice\, CERN \;

    Preceded by zoom lunch at 12:30pm.


    Titl e: Self-Organised Localisation

    Abstract: We describe a new phenomeno n in quantum cosmology: self-organised localisation. When the fundamental p arameters of a theory are functions of a scalar field subject to large fluc tuations during inflation\, quantum phase transitions can act as dynamical attractors. As a result\, the theory parameters are probabilistically local ised around the critical value and the Universe finds itself at the edge of a phase transition. We illustrate how self-organised localisation could ac count for the observed near-criticality of the Higgs self-coupling\, the na turalness of the Higgs mass\, or the smallness of the cosmological constant .
    Seminar will be conducted via zoom\, for zoom link please email mknouse@umd.edu LAST-MODIFIED:20211014T130233Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Joint Cornell/ UMD Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211018T190000Z DTEND:20211018T203000Z DTSTAMP:20220808T214455Z UID:4ek2jl9neuqggqgqkjcs6ahjot@google.com CREATED:20210823T122357Z DESCRIPTION:Speaker: Julian Munoz\, CfA\n\nTitle: 21-cm cosmology in 2021\ n\nAbstract: I will describe how to use the 21-cm line of hydrogen to learn about cosmology and particle physics. I will begin with an overview of the 21-cm signal during cosmic dawn and reionization\, and give an update of t he 2021 status of both theory and data. Then I will show three applications of 21-cm data for new physics. First\, how to use the depth of the signal to learn about anomalous cooling or heating due to dark-matter interactions \, and what the recent HERA measurements tell us about these scenarios. Sec ond\, I will show that the timing of this signal can be used to study DM at small scales and determine whether DM is cold\, warm\, or self interacting . Finally\, I will show how 21-cm provides us with a new standard ruler dur ing cosmic dawn\, at z=15-20\, which will bridge the gap in measurements of the expansion rate H(z) of our universe between the CMB and the local univ erse\, and shed light on potential resolutions to the H0 tension. LAST-MODIFIED:20211014T130123Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211021T150000Z DTEND:20211021T163000Z DTSTAMP:20220808T214455Z UID:7i1sfjf117oip91adrli4sakq3@google.com CREATED:20210831T190001Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/99 485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min social h our at 11am with the seminar at 11:30am

    Speaker: Richard Furnstahl\, Ohio State


    Title: “Short-range-correlation physics in atomic nu clei”
     \;
    Abstract:
    Short-range correlations (SR Cs) in atomic nuclei are usually identified as components of the nuclear wa ve function with momenta well above the Fermi momentum. There has long been an apparent need for SRCs to account for measured cross sections\, but the situation has been murky until recent knock-out experiments succeeded in c leanly isolating this physics. An SRC phenomenology has been developed that accounts for the observations\, but it seems to be at odds with successful descriptions of nuclear structure\, such as the shell model. The applicati on of the renormalization group (RG) can make sense of this conflict. RG me thods are used to analyze critical phenomena in condensed matter and evolve the strong coupling and parton distributions in high-energy quantum chromo dynamics. Applied to nuclei\, the RG shows how SRC physics is manifested di fferently at varying resolution scales. I will illustrate how the RG can br idge low- and high-resolution treatments of the same experiment\, enabling simpler calculations and shedding light on the implications of SRC physics and on long-standing discrepancies between theory and experiment. \; LAST-MODIFIED:20211013T203826Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211020T193000Z DTEND:20211020T203000Z DTSTAMP:20220808T214455Z UID:2310lfmdfcsnns80jl5g3rbn2n@google.com CREATED:20211013T144826Z DESCRIPTION:Title : Normal Forms and Near-Axis Expansions for Beltrami Magn etic Fields

    Speaker Name: Nathan Duignan
    Speaker Institution : Un iversity of Colorado

    Abstract : The structure of magnetic fields nea r the axis of a toroidal confinement device is known from the classical wor ks of Solov'ev and Shafranov\, and Lortz and Nuhrenberg in the 1970s. In th ese classic studies\, as well as more recent work\, it is conventional to a ssume the existence of magnetic surfaces\, as would be guaranteed by the ma gnetostatics equation $J \\times B = \\nabla p$\, or to assume non-resonanc e of the axis. In this seminar\, we revisit this calculation\, without maki ng the assumption of local surfaces or of non-resonance. Utilising the Hami ltonian nature of magnetic fields\, we demonstrate how to construct normal form coordinates near the axis. The normal form coordinates are analogous t o magnetic coordinates\, such as Boozer and Hamada coordinates\, however\, they can be defined regardless of the existence of magnetic surfaces. Moreo ver\, we will see how they can be used to construct approximate magnetic su rfaces near or at resonance. Vacuum and Beltrami (force-free) magnetic fiel ds will be treated\, although the techniques hold more generally.

    Ho st: Marc Swisdak
    Host E-Mail: \;swi sdak@umd.edu LAST-MODIFIED:20211013T144826Z LOCATION:Contact Marc Swisdak (swisdak@umd.edu) for Zoom address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211104T180000Z DTEND:20211104T190000Z DTSTAMP:20220808T214455Z UID:7f9e4j3icna9sq6chrf44oj688@google.com CREATED:20211013T005418Z DESCRIPTION:Title: Google's quantum experiment: a mathematical perspective \nSpeaker: Gail Letzter (NSA and UMD\, College Park)\nTime: Thursday\, No vember 4\, 2021 - 2:00pm\nLocation: Virtual Via Zoom: https://umd.zoom.us/ j/93192622019\n\nIn 2019\, Google announced that they had achieved quantum supremacy: they performed a task on their newly constructed quantum device that could not be accomplished using classical computers in a reasonable am ount of time. In this talk\, we present the mathematics and statistics inv olved in the set-up and analysis of the experiment\, sampling from random q uantum circuits. We start with the theory of random matrices and explain h ow to produce a sequence of (pseudo) random unitary matrices using quantum circuits. We then discuss how the Google team compares quantum and classic al approaches using cross entropy and the Porter-Thomas distribution. Alon g the way\, we present other problems with potential quantum advantage and some of the latest results related to noisy near-term quantum computers. LAST-MODIFIED:20211013T005418Z LOCATION:Virtual Via Zoom: https://umd.zoom.us/j/93192622019 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Gail Letzter TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211025T200000Z DTEND:20211025T210000Z DTSTAMP:20220808T214455Z UID:2lmt820fsbhe7pn5j39inh12j7@google.com CREATED:20210826T200951Z DESCRIPTION:

    Title: In Search of Hidden Conformational S tates of RNA

    Speaker: \;Aaron Frank\, Uni versity of Michigan

    Hosted by: \;Theodore Kwaku Dayie

    Abstract: RNAs are notoriously flexible biomo lecules\, requiring an ensemble-representation of their structure. Construc ting such \;dynamical ensembles\, which comprise the se t of conformations an RNA can adopt\, along with their associated populatio ns\, is challenging because biophysical measurements only \;indi rectly \;report on the properties of the underlying conformati onal (Boltzmann) distribution. In this talk\, I will describe how we use st atistical mechanics to model the dynamical ensembles of RNA using local sol vent accessibility data. My talk will culminate with a description of how w e used experimentally-derived solvent accessibility information to construc t a pair of atomistic ensembles of the aptamer domain of the S-adenosylmeth ionine (SAM) class-I riboswitch. The differences we observed in the resulti ng -SAM and +SAM ensembles are consistent with a SAM-dependent reshaping of the aptamer's dynamical landscape. Interestingly\, within our -SAM ensembl e\, we observed a \;transient conformational state  \;that may be a \;folding intermediate \;and which harbors a \;hidden binding pocket \;that we \;< em>predict \;can selectively recognize small-molecule ligan ds.


    Zoom Link:
    https://umd.zoom.us/j/9788102 0532?pwd=L1ArV203ZlBmU1daMUtwd3VzUlppUT09
    Meeting I D: 978 8102 0532
    Passcode: 504141

    BIPH website: https://ipst .umd.edu/graduate-programs/biophysics/events

    LAST-MODIFIED:20211012T181659Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211018T200000Z DTEND:20211018T210000Z DTSTAMP:20220808T214455Z UID:0fdnmtv5qvv7d5rn2dshevr60v@google.com CREATED:20210830T160736Z DESCRIPTION:

    Title: \;Metabolic imaging using the ph asor approach to FLIM and tracking phenotypic change of mitochondria in can cer cells with Mitometer

    Speaker: \;Michelle Digman\, University of California\, Irvine

    Hosted by: \;Arpita Upadhyaya

    Abstract: The hallmark of metabolic alteration of increase glycolysis\, i.e. Warburg effect\, in c ancer cells together with atypical extracellular matrix structure may be re sponsible for tumor cell aggressiveness and drug resistance. While it is it known that tumor cells stiffen the ECM as the tumor progression occurs\, a direct relationship between ECM stiffness and altered metabolism has not b een explicitly measured. Here we apply the phasor approach technique in flu orescence lifetime imaging microscopy (FLIM) as a novel method to measure m etabolic alteration as a function of ECM mechanics. We imaged and compared triple-negative breast cancer (TNBC) cells to non-cancerous cells on variou s ECM stiffness. Our results show that TNBC exhibit a decreased fraction of bound NADH\, (indicative of glycolysis\,) with increasing substrate stiffn ess. All other cell lines showed little to no change in fraction bound NADH on the varying collagen densities. Dysregulation of mitochondrial motion m ay contribute to the fueling of bioenergy demands in metastatic cancer. To measure mitochondria motion and analyze their fusion and fission events\, w e developed a new algorithm called “mitometer” that is unbiased\, and allow s for automated segmentation and tracking of mitochondria in live cell 2D a nd 3D time-lapse images. Mitometer shows that mitochondria of triple-negati ve breast cancer cells are faster\, more directional\, and more elongated t han those in their receptor-positive counterparts. Furthermore\, Mitometer shows that mitochondrial motility and morphology in breast cancer\, but not in normal breast epithelia\, correlate with fractions of the reduced form of NADH\, in its bound form\, and features such as speed and displacement\, compared to the negative relationships with features such as directionalit y and branching in both TNBC and ER/PR+ mitochondria\, but not in normal br east epithelial mitochondria. Together\, the automated segmentation and tra cking algorithms and the innate user interface make Mitometer a broadly acc essible tool.


    Zoom Link:
    https://umd.zoom.us/j/97881020532?pwd=L1ArV203ZlBmU1daMUtwd3 VzUlppUT09
    Meeting ID: 978 8102 0532
    Passcode: 504141

    BIPH website: \;https://ipst.umd.edu/graduate-programs/bio physics/events

    LAST-MODIFIED:20211012T181639Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211022T150000Z DTEND:20211022T160000Z DTSTAMP:20220808T214455Z UID:65sfbutt81k68otie73vl7e72t@google.com CREATED:20211011T181635Z DESCRIPTION:TITLE:
    Hydrodynamic Quantum Analogs

    SPEAKER: Dr. Pedr o J. Sáenz
    Department of Mathematics
    University of North Carolina at Chapel Hill
     \;
    ABSTRACT
    Millimetric liquid droplets can walk across the surface of a vibrating fluid bath\, self-propelled through a re sonant interaction with their own guiding wave fields. By virtue of the cou pling with their wave fields\, these walking droplets\, or `walkers’\, exte nd the range of classical mechanics to include certain features previously thought to be exclusive to the microscopic\, quantum realm. In this talk\, we will introduce a series of new Hydrodynamic Quantum Analogs involving wa lkers interacting with submerged topographical features at the bottom of th e fluid bath. Special attention will be given to discussing Hydrodynamic Sp in Lattices (HSLs)\, a new analog system that allow us to investigate wave- mediated interactions of effective spin degrees of freedom in inertial and rotating frames. A walker may be trapped by a submerged circular well\, lea ding to clockwise or counterclockwise angular motion centered on the well. When a collection of such wells is arranged in a 1D or 2D lattice geometry\ , a thin fluid layer between wells enables wave-mediated interactions betwe en neighboring droplets. Through experiments and mathematical modeling\, we demonstrate the spontaneous emergence of coherent walker rotation dynamics for different types of lattices. For sufficiently strong pair-coupling\, w ave interactions between neighboring droplets may induce local spin flips l eading to ferromagnetic or antiferromagnetic order. Transitions between the se two forms of magnetic order can be induced through variations in non-equ ilibrium driving\, lattice geometry and Coriolis forces mimicking an extern al magnetic field. Theoretical predictions based on a generalized Kuramoto model derived from first principles rationalize our experimental observatio ns\, thus establishing HSLs as a generic paradigm for active phase oscillat or dynamics.
    BIO
    Pedro is an Assistant Professor and the director of the Physical Mathematics Laboratory (www.p ml.unc.edu) in the Department of Mathematics at UNC. From 2015 to 2019\ , he was an Instructor in Applied Mathematics at MIT. Pedro received his Ph .D. from the University of Edinburgh in 2014\, and was a post-doctoral fell ow at UMD and Imperial College London in 2015. His research blends experime nts\, numerical simulations and theory to address fundamental problems that find motivation in physics and engineering.
     \;
     \;
    Host:  \;Jungho Kim \; \;
    kimjh@um d.edu LAST-MODIFIED:20211011T182038Z LOCATION:DeWalt Seminar Room\, 2164 Glenn L. Martin Hall\, 4298 Campus Dr SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Mechanical Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211101T203000Z DTEND:20211101T213000Z DTSTAMP:20220808T214455Z UID:7mrgakr7u3skjgrg78jd5ibnr7@google.com CREATED:20211009T143206Z DESCRIPTION:Title: Cosmic rays coming of age\n\nSpeaker: Philipp Mertsch\, Institute for Theoretical Particle Physics and Cosmology (TTK)\, RWTH Aache n University\, Aachen\, Germany\n\nAbstract: Cosmic rays (CRs) are messenge rs of the violent universe and interpretations of CR measurements can be us ed to infer the properties of such environments as far as overall energetic s\, structure and dynamics are concerned. In addition\, CRs have a dynamica l effect in a variety of environments\, shaping not only the medium that th ey themselves travel in\, but also affecting other constituents\, e.g. magn etic fields\, radiation and the thermal gas. We will review the status of G alactic CRs as of mid/late 2021\, both from the observational and the theor etical side. We will summarise the new data from space-borne experiments on CR electrons and positrons\, proton and helium as well as heavier nuclei a nd their isotopes. We will cover a couple of novel aspects in the modeling of acceleration of CRs at non-relativistic shocks and in their feedback on Galactic scales.\n\nNotes: Join the meeting at 4:15 for meet and greet LAST-MODIFIED:20211009T143207Z LOCATION:Online via Zoom\, visit https://bit.ly/2PmJoT6 for access SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211013T163000Z DTEND:20211013T190000Z DTSTAMP:20220808T214455Z UID:1uqf30bk40fgi08v2jkqvcq89r@google.com CREATED:20211008T140359Z DESCRIPTION:Title : "Looking forward to new physics at the LHC"

    Spea ker Name: Felix Kling
    Speaker Institution : SLAC

    Abstract : Physi cs searches and measurements at high-energy collider experiments traditiona lly focus on the high-pT region. However\, if particles are light and weakl y-coupled\, this focus may be completely misguided: light particles are typ ically highly collimated around the beam line\, allowing sensitive searches with small detectors\, and even extremely weakly-coupled particles may be produced in large numbers there. In the upcoming run of the LHC\, the FASER experiment will use the opportunity and extend the LHC's physic potential by searching for long-lived particles and studying neutrino interactions at TeV energies. A continuation of this forward physics program for the HL-LH C era\, in the form of a 'forward physics facility' with larger scale exper iments\, is currently under discussion. In this talk\, I will present the p hysics potential of these experiments for new physics searches\, neutrino p hysics\, QCD and astro-article physics aiming to stimulate a fruitful discu ssion with my audience.

    Lunch at 12:30\; talk at 1:30

    Name: S ally Megonigal
    E-Mail: \;smegonig@ umd.edu LAST-MODIFIED:20211008T140359Z LOCATION:https://zoom.us/j/96801941719?pwd=Wm16MnplYzJYVTZ4K1BocE80Yndxdz09 (Meeting ID: 968 0194 1719\, with Passcode: 1866 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Elementary Particles (Talk begins at 1:30pm) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211015T160000Z DTEND:20211015T164500Z DTSTAMP:20220808T214455Z UID:3js7snjlmaimthhkh1fgpggvb9@google.com CREATED:20211007T230703Z DESCRIPTION:Title: Experimental simulation of para-particle dynamics\nSpea ker: Cinthia Huerta (JQI/Los Alamos National Laboratory)\nTime: Friday\, O ctober 15\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https ://umd.zoom.us/j/99484119207\n\nQuantum mechanics allows for a consistent f ormulation of particles that are neither bosons nor fermions. In this talk\ , I’ll present a particular example of those particles\, the so-called para -particles\, which arise as a generalization of the usual bosons and fermio ns. Even though these particles are unlikely to be present in nature\, a qu antum system involving a spin-½ degree of freedom coupled to two bosonic mo des yields a Hamiltonian that describes para-bosons and para-fermions. Duri ng the talk\, I’ll present the analog simulation of para-particle oscillato rs with a single trapped ion by tailoring the native couplings of two ortho gonal motional modes in the trap\, as well as its digital implementation on a trapped-ion quantum computer. Our results reproduce the well-defined dy namics for para-bosons and para-fermions of even order\, demonstrates the f ull controllability of para-particle oscillators using a trapped-ion experi ment\, and represent an opportunity for the verification of previously prop osed and future para-particle applications.\n\nPizza and drinks served afte r the talk. LAST-MODIFIED:20211007T230703Z LOCATION:ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Cinthia Huerta TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211011T190000Z DTEND:20211011T203000Z DTSTAMP:20220808T214455Z UID:1gavfnrmb1o0jj1s3ltpm2oujf@google.com CREATED:20210809T204616Z DESCRIPTION:Speaker: Pouya Asadi\, MIT\n\nTitle: Darkness Beyond Unitarity\ n\nAbstract: There has been substantial effort on searching for thermal Dar k Matter (DM) in the conventional mass window of GeV to tens of TeV without any positive results. This null result has motivated efforts to develop ne w dynamics in the dark sector that allow us go beyond the usual thermal DM mass window. In this talk\, I introduce two such simple mechanisms. First I will point out a potentially dramatic effect on the DM abundance in a clas s of confining dark sectors during its deconfinement phase transition. I wi ll then switch to an even simpler setup where entropy dump into SM (from de cay of another thermal relic) can open up a substantial parameter space for DM mass. I will discuss the viable mass range for DM in each setup and how it is affected by details of dark sector dynamics. I will also discuss way s we can probe such setups in future. LAST-MODIFIED:20211007T175114Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211014T150000Z DTEND:20211014T163000Z DTSTAMP:20220808T214455Z UID:1jp3rd1hosk85qi3qp4e559t6t@google.com CREATED:20210830T185733Z DESCRIPTION:Speaker: Niklas Mueller\, UMD\n\nTitle: Thermalization of Gauge Theories from their Entanglement Spectrum\n\n\nAbstract: Using dual theori es embedded into a larger unphysical Hilbert space along entanglement cuts\ , we study the Entanglement Structure of Z2Z lattice gauge theory in (2+1)( 2+1) spacetime dimensions. We find that Li and Haldane's conjecture holds f or gauge theories\, and show consistency of the Entanglement Hamiltonian wi th the Bisognano-Wichmann theorem. Studying non-equilibrium dynamics after a quench\, we provide a complete description of thermalization in Z2Z gauge theory which proceeds in a characteristic sequence: Maximization of the Sc hmidt rank and spreading of level repulsion at early times\, self-similar e volution with scaling coefficients α=0.8±0.1α=0.8±0.1 and β=0.05±0.03β=0.05 ±0.03 at intermediate times\, and finally thermal saturation of the von Neu mann entropy. LAST-MODIFIED:20211007T131840Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20211012T170000Z DTEND:20211012T181500Z DTSTAMP:20220808T214455Z UID:1mi2b8jo2o05gimijlg0spbjrs@google.com CREATED:20211005T135321Z DESCRIPTION:Speaker: Johnathan Weare\, New York University - \;https://cims.nyu.edu/~weare/

    Titl e: A Fresh Look at Learning Long-Timescale Phenomena From Trajectory Data
    Abstract: \;Events that occur on very long timescales are often t he most interesting features of complicated dynamical systems. Even when we are able to reach the required timescales with a sufficiently accurate com puter simulation\, the resulting high dimensional data is difficult to mine for useful information about the event of interest. Markov state modeling (MSM) in particular has proven a powerful tool for turning trajectory data into useful understanding of long-timescale processes. Taking a new perspec tive on trajectory data analysis methods I will describe a family of method s that generalize MSMs with the aim of computing predictions of specific lo ng timescale phenomena using only relatively short trajectory data (e.g. mu ch shorter than the return time of the event). This new perspective points in exciting new directions for both rare event analysis algorithms as well mathematical analysis. In particular\, I will explain the remarkable error properties in approximations of specific rare event forecasts achievable us ing a data set of short trajectories alone.

    Below is the ZOOM seminar link.

    ZOOM: \;https:/ /go.umd.edu/statphys_zoom.

    LAST-MODIFIED:20211006T161451Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211013T173000Z DTEND:20211013T183000Z DTSTAMP:20220808T214455Z UID:14qdonjqsh8k5cpe1m9e6r9ndt@google.com CREATED:20210823T132507Z DESCRIPTION:Speaker: Felix Kling\, \;DESY

    Preceded by 12:30pm vi rtual lunch.

    Title: Looking forward to new physics at the LHC

    Abstract: Physics searches and measurements at high-energy collider experi ments traditionally focus on the high-pT region. However\, if particles are light and weakly-coupled\, this focus may be completely misguided: light p articles are typically highly collimated around the beam line\, allowing se nsitive searches with small detectors\, and even extremely weakly-coupled p articles may be produced in large numbers there. In the upcoming run of the LHC\, the FASER experiment will use the opportunity and extend the LHC's p hysic potential by searching for long-lived particles and studying neutrino interactions at TeV energies. A continuation of this forward physics progr am for the HL-LHC era\, in the form of a 'forward physics facility' with la rger scale experiments\, is currently under discussion. In this talk\, I wi ll present the physics potential of these experiments for new physics searc hes\, neutrino physics\, QCD and astro-article physics aiming to stimulate a fruitful discussion with my audience.

    For zoom link please email < a href="mailto:mknouse@umd.edu">mknouse@umd.edu LAST-MODIFIED:20211006T133904Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint JHU/ UMD Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211108T210000Z DTEND:20211108T220000Z DTSTAMP:20220808T214455Z UID:3n3k02no1ndc0blu4sorq2dqop@google.com CREATED:20211005T202014Z DESCRIPTION:

    Title: \;CRYO-EM OF MEMBRANE PROTEINS:& nbsp\;WHAT HAVE WE LEARNED IN THE LAST DECADE AND WHAT ARE THE CURRENT CHAL LENGES?

    Speaker: \;Doreen Matthies\, NIH/NICHD

    Hosted by: \;Sergei Sukha rev

    Abstract: \;In the last decade the field of Structural Biology has made great advances in using electron microscopy to solve stru ctures of protein complexes including membrane proteins to high resolution. Best practices of how to use Single Particle Cryo-EM and more importantly how to optimize a membrane protein sample such as an ion channel or a trans porter will be discussed. Most membrane protein structures are currently re solved in a detergent micelle\, but cryo-EM also makes it possible to look at membrane protein complexes in a lipid bilayer\, such as lipid nanodiscs\ , liposomes\, or even inside cells now. A brief introduction to each of the se techniques will be discussed with examples of the conformational landsca pe of magnesium channel CorA\, voltage-gated potassium channel Kv1.2-2.1\, a human excitatory amino acid transporter and more.

    BIPH website: https://ipst.umd.edu/graduate-programs/biophysics/ events

    LAST-MODIFIED:20211005T202053Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211015T193000Z DTEND:20211015T203000Z DTSTAMP:20220808T214455Z UID:78edv8vhcvh1boi08besec3bhb@google.com CREATED:20211005T170547Z DESCRIPTION:Speaker: Professor Pratyush Tiwary\, UMD\n\nTitle: From Atoms t o Mechanisms: Artificial Intelligence Augmented Chemistry for Molecular Sim ulations and Beyond\n\nAbstract: The ability to rapidly learn from high-dim ensional data to make reliable predictions about the future is crucial in m any contexts. This could be a fly avoiding predators\, or the retina proces sing terabytes of data guiding complex human actions. Modern day artificial intelligence (AI) aims to mimic this fidelity and has been successful in m any domains of life. It is tempting to ask if AI could also be used to unde rstand and predict the emergent mechanisms of complex molecules with millio ns of atoms. In this colloquium I will show that certain flavors of AI can indeed help us understand generic molecular and chemical dynamics and also predict it even in situations with arbitrary long memories. However this re quires close integration of AI with old and new ideas in statistical mechan ics. I will talk about such methods developed by my group using different f lavors of generative AI such as information bottleneck\, recurrent neural n etworks and denoising probabilistic models. I will demonstrate the methods on different problems\, where we predict mechanisms at timescales much long er than milliseconds while keeping all-atom/femtosecond resolution. These i nclude ligand dissociation from flexible protein/RNA and crystal nucleation with competing polymorphs. I will conclude with an outlook for future chal lenges and opportunities. LAST-MODIFIED:20211005T173459Z LOCATION:CHEM 1402 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Phys/ANE/ChemPhys Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211012T173000Z DTEND:20211012T193000Z DTSTAMP:20220808T214455Z UID:30m4peu3r4el6sgo8sbdjtnj3i@google.com CREATED:20210928T160909Z DESCRIPTION:Title: Quantum routing for architecture-respecting circuit tra nsformations\nSpeaker: Eddie Schoute (QuICS)\nTime: Tuesday\, October 12\ , 2021 - 1:30pm\nLocation: ATL 3100A (faculty only) and Virtual via Zoom: https://umd.zoom.us/j/98433503998?pwd=eUQzKy9lS3BtSHJhR0JuLzlPZE0zUT09\n\nT he connectivity between qubits is one of the many design aspects that go in to building a quantum computer. Better connectivity makes it easier to perf orm arbitrary interacting operations in quantum algorithms\, but it may als o come with additional noise and may be costly to manufacture. Therefore\, many proposals for scalable quantum computer architectures sacrifice connec tivity to obtain better modularity and suppress noise. This poses a challen ge to running quantum algorithms because simulating missing connectivity ca n come with significant overhead.\n\nA natural stepping stone is permuting qubits on the architecture\, a task we call quantum routing. We first give a rigorous analysis for the special case of classical routing using SWAP ga tes. Then we present a time-independent Hamiltonian protocol that reverses a chain of qubits asymptotically 3 times faster than classical routing. Usi ng this protocol\, we exhibit the first separation between classical and qu antum routing time. This leads us to lower bound unitary quantum routing to be inversely proportional to the vertex expansion of the architecture grap h in a gate model and inversely proportional to the edge expansion in a Ham iltonian evolution model. We rule out a superpolynomial separation between classical and quantum routing for architectures with poor expansion propert ies such as grid graphs.\n\nWe then show how to use routing to transform qu antum circuits such that their interactions respect the architecture constr aints while attempting to minimize the depth overhead. We benchmark the per formance of our circuit transformations on grid and modular architectures.\ nFinally\, we give a circuit transformation for fault-tolerant quantum comp utation in the surface code. We use a construction for parallel long-range operations in constant logical time that allows us to avoid the need for ro uting altogether. Our benchmarks show improved performance over our previou s circuit transformations using classical routing. LAST-MODIFIED:20211005T155747Z LOCATION:https://umd.zoom.us/j/98433503998?pwd=eUQzKy9lS3BtSHJhR0JuLzlPZE0z UT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense: Eddie Schoute TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211008T160000Z DTEND:20211008T164500Z DTSTAMP:20220808T214455Z UID:7vcf9neu1fd8d9r7v4closp418@google.com CREATED:20210930T174640Z DESCRIPTION:Title: Observation of measurement-induced quantum phases in a trapped-ion quantum computer\nSpeaker: Pradeep Niroula (QuICS)\nTime: Fri day\, October 8\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207\n\nMany-body open quantum systems balanc e internal dynamics against decoherence from interactions with an environme nt. In this talk\, I describe an experiment that explores this balance via random quantum circuits implemented on a trapped-ion quantum computer\, whe re the system evolution is represented by unitary gates with interspersed p rojective measurements. As the measurement rate is varied\, a purification phase transition is predicted to emerge at a critical point akin to a fault -tolerant threshold. In the experiment\, we probe the "pure'' phase\, where the system is rapidly projected to a deterministic state conditioned on th e measurement outcomes\, and the "mixed'' or "coding'' phase\, where the in itial state becomes partially encoded into a quantum error correcting codes pace. We find evidence of the two phases and show numerically that\, with m odest system scaling\, critical properties of the transition emerge.\n\nPiz za and drinks served after the talk. LAST-MODIFIED:20211005T152050Z LOCATION:https://umd.zoom.us/j/99484119207 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Pradeep Niroula TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211007T140000Z DTEND:20211007T150000Z DTSTAMP:20220808T214455Z UID:03cjq2th3v6j4eggagt1p6u44p@google.com CREATED:20210930T233700Z DESCRIPTION:Title: Bounding quantum capacities via partial orders and comp lementarity\nSpeaker: Christoph Hirche (Technische Universität München and National University of Singapore)\nTime: Thursday\, October 7\, 2021 - 10 :00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/91230236736?pwd=U k5zalFSTnZUQnhZQkFaN0ZnL05XUT09\n\nCalculating quantities such as the quant um or private capacity of a quantum channel is a fundamental\, but unfortun ately a generally very hard\, problem. A well known class of channels for w hich the task simplifies is that of degradable channels\, and it was later shown that the same also holds for a potentially bigger class of channels\, the so called less noisy channels. Based on the former\, the concept of ap proximately degradable channels was introduced to find bounds on capacities for general channels. We discuss how the idea can be transferred to other partial orders\, such as less noisy and more capable channels\, to find pot entially better capacity bounds. Unfortunately these are not necessarily ea sy to compute\, but we show how they can be used to find operationally mean ingful bounds on capacities that are based on the complement of the quantum channel and might give a deeper understanding of phenomena such as superad ditivity. Finally\, we discuss how the framework can be transferred to quan tum states to bound the one-way distillable entanglement and secret key of a bipartite state. LAST-MODIFIED:20211005T152008Z LOCATION:https://umd.zoom.us/j/91230236736?pwd=Uk5zalFSTnZUQnhZQkFaN0ZnL05X UT09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Christoph Hirche TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211006T143000Z DTEND:20211006T154500Z DTSTAMP:20220808T214455Z UID:1csh2c2glf21kh6ooksmgc89oi@google.com CREATED:20210922T133139Z DESCRIPTION:Title: A hidden variable model for universal quantum computati on with magic states on qubits
    Speaker: Robert Raussendorf (University of British Columbia)
    Time: Wednesday\, October 6\, 2021 - 10:30am
    Lo cation: Virtual Via Zoom: http s://umd.zoom.us/j/96079067479 Meeting ID: 960 7906 7479

    We show that every quantum computation can be described by a probabilistic update o f a probability distribution on a finite phase space. Negativity in a quasi probability function is not required in states or operations. Our result is consistent with Gleason’s theorem and the Pusey-Barrett-Rudolph theorem.Joint work with: Michael Zurel and Cihan Okay
    J-Ref: Phys. Rev. Lett. 125\, 260404 (2020)

    (Please note the earlier start time of 10:30 a.m . for this seminar.) LAST-MODIFIED:20211005T151930Z LOCATION:https://umd.zoom.us/j/96079067479 Meeting ID: 960 7906 7479 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Robert Raussendorf TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211021T180000Z DTEND:20211021T190000Z DTSTAMP:20220808T214455Z UID:7u7f4p7ii0j6hr3da4avdvls9r@google.com CREATED:20211005T151133Z DESCRIPTION:Title: Clifford groups are not always 2-designs\nSpeaker: Mat thew Graydon (University of Waterloo )\nTime: Thursday\, October 21\, 2021 - 2:00pm\nLocation: Virtual Via Zoom: https://uwaterloo.zoom.us/j/9302519 4699?pwd=bjVJZVpIQXJkS1U2aXg2d3Q3QVhBdz09\n\nA group 2-design is a unitary 2-design arising via the image of a suitable compact group under a projecti ve unitary representation in dimension d. The Clifford group in dimension d is the quotient of the normalizer of the Weyl-Heisenberg group in dimensi on d\, by its centre: namely U(1). In this talk\, we prove that the Cliffo rd group is not a group 2-design when d is not prime. Our main proofs rely\ , primarily\, on elementary representation theory\, and so we review the es sentials. We also discuss the general structure of group 2-designs. In part icular\, we show that the adjoint action induced by a group 2-design splits into exactly two irreducible components\; moreover\, a group is a group 2- design if and only if the norm of the character of its so-called U-Ubar rep resentation is the square root of two. Finally\, as a corollary\, we see th at the multipartite Clifford group (on some finite number of quantum system s) also often fails to be a group 2-design.\n\nThis talk is based on joint work with Joshua Skanes-Norman and Joel J. Wallman\; arXiv:2108.04200 [quan t-ph]. LAST-MODIFIED:20211005T151133Z LOCATION:https://uwaterloo.zoom.us/j/93025194699?pwd=bjVJZVpIQXJkS1U2aXg2d3 Q3QVhBdz09 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Matthew Graydon TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211006T190000Z DTEND:20211006T200000Z DTSTAMP:20220808T214455Z UID:3jb2rugmobjoofvo6n65gejma6@google.com CREATED:20210907T150025Z DESCRIPTION:*Joint Gravity &\; Particle Theory Seminar*

    Also will be streamed by zoom: \;https:// umd.zoom.us/j/562421853

    Speaker: Ira Rothstein\, Carnegie Mellon University

    Title:
    A Generic Class of Field Theories that Appe ar to be Finely Tuned

    Abstract:
    The Wilsonian paradigm asserts t hat hierarchies imply the existence of new UV physics to maintain naturalne ss. However\, we know that this strong imperative can be avoided by allowin g for the ground state to evolve\, as in Abbotts' proposal to solve the cos mological constant problem. Recently there have been similar proposals to s olve the electro-weak hierarchy problem via a relaxation mechanism\, which however depend upon specific cosmological evolution including a ``trigger mechanism” that halts the evolution. In this talk I will show that there i s a class of effective field theories which have hidden relaxation mechanis ms\, and avoid the need for any cosmological model building\, when the ta rget space is compact. LAST-MODIFIED:20211004T135212Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Gravity and Particle Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211007T150000Z DTEND:20211007T163000Z DTSTAMP:20220808T214455Z UID:3rb31lh8a2mdv0oiua5e6ndd69@google.com CREATED:20210831T185815Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/99 485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min social h our at 11am with the seminar at 11:30am

    Speaker: Gurtej Kanwar\, MIT /Bern

    Title: Observifolds: Taming the observable signal-to-noise pro blem via path integral contour deformations


    Abstract: Contour de formations of the path integral have been shown to mitigate sign problems a ssociated with non-zero chemical potential and real-time evolution in latti ce field theories. This talk details recent extensions to observables affec ted by signal-to-noise problems in theories with real actions. Contour defo rmations allow redefining observables without affecting their expectation v alue or modifying the Monte Carlo sampling weights\, while their variance c an be optimized to maximize the signal-to-noise ratio. We define families o f contour deformations for SU(N) variables and demonstrate exponential impr ovements in the signal-to-noise ratio of Wilson loops in proof-of-principle applications to U(1) and SU(N) lattice gauge theories. LAST-MODIFIED:20211004T135008Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211008T170000Z DTEND:20211008T210000Z DTSTAMP:20220808T214455Z UID:7qfp0bp26g8q247emrlnm45i6r@google.com CREATED:20210929T180638Z DESCRIPTION:More information: \;


    https://ipst.um d.edu/research/burgers/events/annual-lectures-symposia

    Progra m:

    https://ipst.umd.edu/sites/defau lt/files/documents/burgers_posters/ProgramBurgersSymp2021.pdf LAST-MODIFIED:20211001T162954Z LOCATION:J. M. Patterson Building Room 2116 and on Zoom: https://go.umd.edu /BurgersSymposium2021 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:The Burgers Program for Fluid Dynamics Eighteenth Annual Symposium TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211006T200000Z DTEND:20211006T213000Z DTSTAMP:20220808T214455Z UID:51lbpif1qph1mqok9aceptbj73@google.com CREATED:20211001T160914Z DESCRIPTION:Speaker: Dan Zhang\, University of Maryland\n\n\nTitle : "Dark Matter Search in PandaX-4T Commissioning Run"\n\nAbstract : PandaX-4T exper iment searches for dark matter particles with a dual-phase time projection chamber holding 4 tonne liquid xenon in the sensitive volume. After the lab and detector construction for more than two years at China Jinping Undergr ound Laboratory\, PandaX-4T has begun to take scientific data since the end of the year 2020. In this talk\, I will give an overview of the PandaX-4T hardwares and the weakly interacting massive particles (WIMPs) search with our commissioning data\, including calibration\, signal reconstruction and profile likelihood ratio analysis. LAST-MODIFIED:20211001T160914Z LOCATION:Zoom Information: Zoom coordinates: https://umd.zoom.us/j/9121084 7449?pwd=Y2prQW05S29EYjZlbHZLZkNSU0JHQT09 passcode 300061 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211101T200000Z DTEND:20211101T210000Z DTSTAMP:20220808T214455Z UID:3t0nqp9m5doln4koojceh7rjd2@google.com CREATED:20210826T201039Z DESCRIPTION:

    Title: \;MD simulations\, free-energy c alculations\, and machine learning applied to the SARS-CoV-2 spike protein< /p>

    Speaker: \;James (JC) Gumbart\, Georgia Institute of Technology

    Hosted by: \;&n bsp\;Jeffery Klauda

    Abstract: \;

    The SARS- CoV-2 virus is \;a strain of coronaviruses\, named for the characterist ic trimeric spike (S) \;glycoproteins that protrude from the viral memb rane surface. The S proteins are \;type I fusion proteins\, \;which upon recognition of ACE2\, their host cell receptor\, \;undergo substa ntial conformational change \;leading to membrane fusion and viral  \;entry. Using molecular dynamics simulations\, we have investigated \; several \;aspects of this process\, including the conformational landsc ape of the pre-fusion S protein as \;well as receptor \;binding. Be fore binding\, the receptor-binding \;domain on the S protein must firs t open to make the \;binding site accessible. We \;have carried out two-dimensional replica-exchange umbrella sampling to \;determine the minimum-free-energy pathway for this opening using NAMD on the \;nation ’s largest \;supercomputer\, Summit at Oak Ridge National Laboratory. O ur \;simulations reveal\, in particular\, the role of \;S-protein g lycans in modulating \;the opening process. Next\, machine learning app lied to multiple \;microsecond-scale \;trajectories has allowe d us to identify key residues that differentiate between \;SARS-CoV and SARS-CoV-2 S-protein binding to the receptor. Free-energy \;perturbati on of selected residues \;further reveals the energetic contributions&n bsp\;of individual mutations. Finally\, we have also determined the \;c ontribution of \;the ACE2 receptor glycans to binding\, illustrating wh y SARS-CoV-2 may bind more \;readily \;than SARS-CoV.

    BIPH website: https://ipst.umd.edu/graduate-programs/biophysics/events

    LAST-MODIFIED:20210930T174751Z LOCATION:Conference Room (1116) of the Institute for Physical Science and T echnology (IPST) Building SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211006T193000Z DTEND:20211006T203000Z DTSTAMP:20220808T214455Z UID:7ntil0i2tseojmo4i55tcqmjjp@google.com CREATED:20210929T181729Z DESCRIPTION:Title : Evolution of large-amplitude Alfven waves and generatio n of switchbacks in the expanding solar wind

    Speaker: Alfred Mallet\ , \;UC-Berkeley

    Abstract : Motivated by recent Parker Solar Prob e observations of “switchbacks” (abrupt\, large- amplitude reversals in the radial magnetic field\, which exhibit Alfvenic correlations) we examine th e dynamics of large-amplitude Alfven waves in the expanding solar wind. We develop an analytic model which makes several predictions: switchbacks shou ld preferentially occur in regions where the solar wind plasma has undergon e a greater expansion\, the switchback fraction at radii comparable to PSP should be an increasing function of radius\, and switchbacks should have th eir gradients preferentially perpendicular to the mean magnetic field direc tion. The expansion of the plasma generates small compressive components as part of the wave’s nonlinear evolution: these are maximized when the norma lized fluctuation amplitude is comparable to sin θ\, where θ is the angle b etween the propagation direction and the mean magnetic field. These compres sive components steepen the primary Alfvenic waveform\, keeping the solutio n in a state of nearly constant magnetic field strength as its normalized a mplitude δB/B grows due to expansion. The small fluctuations in the magneti c-field-strength are minimized at a particular θ-dependent value of β\, usu ally of order unity\, and the density and magnetic- field-strength fluctuat ions can be correlated or anticorrelated depending on β and θ. Example solu tions of our dynamical equation are presented\; some do indeed form magneti c-field reversals. Our predictions appear to match some previously unexplai ned phenomena in observations and numerical simulations\, providing evidenc e that the observed switchbacks can result from the nonlinear evolution of the initially small-amplitude Alfven waves already known to be present at t he coronal base.

    Host Name: Marc Swisdak
    Host E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20210929T181729Z LOCATION:Contact Marc Swisdak at swisdak@umd.edu for Zoom information SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211006T150000Z DTEND:20211006T161500Z DTSTAMP:20220808T214455Z UID:1b90gu0v8fc97c2293tqhos4t1@google.com CREATED:20210914T154401Z DESCRIPTION:Speaker: Kishalay Mahato\, Fourkas Group

    Title: The Dete rmination of Stimulated Emission Cross-Section from Fluorescence Signal

    Abstract: TBD LAST-MODIFIED:20210929T143745Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211005T170000Z DTEND:20211005T181500Z DTSTAMP:20220808T214455Z UID:5s92j7fuqddja0qhnk7siils6r@google.com CREATED:20210913T181349Z DESCRIPTION:Speaker: Chris Mundy\, PNNL

    Title: Top-Down and Bottom-U p Modeling of Aggregation and Assembly in Complex Material Systems

    A bstract: The statistical analysis of molecular dynamics simulations require s dimensionality reduction techniques\, which yield a low-dimensional set o f collective variables x_i = x that in some sense describe the essential dy namics of the system. Considering the distribution P(x) of the collective v ariables\, the primal goal of a statistical analysis is to detect character istic features of P(x)\, in particular\, its maxima and their connection pa ths. This is because these features characterize the low-energy regions and the energy barriers of the corresponding free energy landscape\, and there fore amount to the metastable states and transition regions of the system. In this seminar\, we outline a systematic strategy to identify collective v ariables and metastable states\, which subsequently can be employed to cons truct a Langevin or a Markov state model of the dynamics. In particular\, w e account for the still limited sampling typically achieved by molecular dy namics simulations\, which in practice seriously limits the applicability o f theories (e.g.\, assuming ergodicity) and black-box software tools (e.g.\ , using redundant input coordinates). We show that it is essential to use i nternal (rather than Cartesian) input coordinates\, employ dimensionality r eduction methods that avoid rescaling errors (such as principal component a nalysis)\, and perform density based (rather than k-means-type) clustering. Finally we discuss a machine learning approach to dimensionality reduction \, that highlights the essential internal coordinates of a system and may r eveal hidden reaction mechanisms.

    F. Sittel and G. Stock\, Perspective Ar ticle in J. Chem. Phys 149\, 150901 (2018)

    S.Brandt\, F. Sittel\, M. Ernst\, and G. Stock\, Machine Learning of Biomolecular Reaction Coordinate s\, J. Phys. Chem. Lett. 9\, 2144 (2018) \;


    Where: \;
    https://go.umd.edu/statphys_zoom

    1:15pm (An informal pre-seminar chat with the speaker\, to whic h all are invited\, will be held at 1:00pm). LAST-MODIFIED:20210928T135105Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Virtual Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211004T190000Z DTEND:20211004T203000Z DTSTAMP:20220808T214455Z UID:7c4qq63ouc2a7ql8fbv8h49b1g@google.com CREATED:20210907T133454Z DESCRIPTION:Speaker: Maira Dutra\, Carleton University\n\nTitle: Testable p ortal models of FIMP dark matter\n\nAbstract: Dark matter particles can int eract so weakly with the standard\nmodel fields that they may never have re ached thermal equilibrium in the\nearly universe. The relic density of such feebly interacting massive\nparticles (FIMPs) is produced via the so-calle d freeze-in mechanism.\nThis possibility can explain why we have not yet de tected dark matter\nbut is also appealing from a theoretical perspective si nce tiny\ncouplings might be a consequence of GUT scale fields. In this tal k\, I\nwill overview the literature on FIMP phenomenology and present two\n testable FIMP models. The first model is a neutrino portal where three\nrig ht-handed heavy neutrinos participate in the type-I seesaw mechanism\nwhile mediating interactions between the visible and dark sectors. If a\nsuffici ently long early matter-dominated period occurred during the\nfreeze-in pro cess\, FIMP self-annihilation becomes testable by indirect\ndetection exper iments. The second model is a Z' portal in which the SM\nfermions and a fer mionic dark matter candidate are both charged under a\nnew U(1) symmetry. R emarkably\, the rich phenomenology of Z' bosons is\ncurrently constraining regions of the Z' parameter space in which the\ndark matter relic density i s achieved via freeze-in. LAST-MODIFIED:20210928T132928Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211018T203000Z DTEND:20211018T213000Z DTSTAMP:20220808T214455Z UID:6ju1anj7glnm4envuthlumnafi@google.com CREATED:20210925T210946Z DESCRIPTION:Title: Atmospheric muon measurements and prompt muon sensitivit y study for KM3NeT

    Speaker: Piotr Kalaczynski\, National Centre for Nuclear Research\, Warsaw\, Poland

    Abstract: The K M3NeT Collaboration has successfully deployed a number of detection uni ts of the next generation undersea neutrino telescopes in the Mediterranean Sea at the two sites in Italy and in France. The data sample collected bet ween December 2016 and January 2020 has been used to measure the atmospheri c muon rate at two different depths under the sea level: 3.5 km with KM3NeT ARCA and 2.5 km with KM3NeT-ORCA. Atmospheric muons represent an abundant s ignal in a neutrino telescope and can be used to test the reliability of th e Monte Carlo simulation chain and to study the physics of extensive air sh owers caused by highly-energetic primary nuclei impinging the Earth’s atmos phere. At energies above PeV the contribution from prompt muons\, created r ight after the first interaction in the shower\, is expected to become domi nant\, however its existence has not yet been experimentally confirmed. In this talk\, data collected with the first detection units of KM3NeT are com pared to Monte Carlo simulations based on MUPAGE and CORSIKA codes. The mai n features of the simulation and reconstruction chains are presented. Addit ionally\, the first results of the simulated signal from the prompt muon co mponent for KM3NeT-ARCA and KM3NeT-ORCA obtained with CORSIKA are discussed .

    Notes: Join the meeting at 4:15 for meet and greet LAST-MODIFIED:20210925T210946Z LOCATION:Via Zoom. Visit https://bit.ly/2PmJoT6 for access SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210927T203000Z DTEND:20210927T213000Z DTSTAMP:20220808T214455Z UID:305oo1t6gg9h5aj1b3ltl3dd2j@google.com CREATED:20210913T164314Z DESCRIPTION:Title: Modeling Blazar Jets with Particle Transport Methods (an d a discussion of Snowmass)

    Speaker: Tiffany Lewis\, NASA Goddard Sp ace Flight Center

    Abstract: Blazars are luminous active galaxies wit h a jet pointed along our line of sight. They give us a unique view into on e of the most extreme particle acceleration regions in the Universe\, with observations across the entire electromagnetic spectrum. Blazars are the mo st numerous extragalactic sources in the gamma-rays\, and can have variabil ity timescales on the order of minutes. However\, the particle acceleration mechanisms that give rise to the power in these observed signals are not w ell understood. One method of addressing this problem intuitively is to sim ulate the particle energies from first principles\, and then carefully calc ulate observables\, like time lags\, spectra\, and polarization fraction\, to compare with existing data or predict observables for upcoming missions like AMEGO-X. \;Snowmass is a collective (inter)nation al scientific planning process that helps determine the future foci of the High-Energy Physics and Astrophysics (HEPA) community. The Snowmass Process takes place every 5–10 years and shapes the goals for experimentalists and theorists for the next 10–20 years through funding priority recommendation s for NSF and DOE. Discussions of the future of HEPA take place over multip le research "Frontiers\," including Energy\, Neutrino Physics\, Cosmic. Thr ough discussions and white papers\, you can steer the future of HEPA resear ch. The process culminates in the community informing the next Particle Phy sics Project Prioritization Panel (P5). LAST-MODIFIED:20210925T210609Z LOCATION:Via Zoom. Visit https://bit.ly/2PmJoT6 for access SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211001T170000Z DTEND:20211001T180000Z DTSTAMP:20220808T214455Z UID:25bemrp8dur1864f6nis1hpfli@google.com CREATED:20210914T145516Z DESCRIPTION: LAST-MODIFIED:20210924T202951Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar - CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211210T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20211028T140000 EXDATE;TZID=America/New_York:20211125T140000 EXDATE;TZID=America/New_York:20211202T140000 EXDATE;TZID=America/New_York:20211118T140000 EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211021T140000 EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20211104T140000 EXDATE;TZID=America/New_York:20211111T140000 EXDATE;TZID=America/New_York:20210930T140000 DTSTAMP:20220808T214455Z UID:7r5kf6la3hq1lh7ri1rv4paqij@google.com CREATED:20210924T122743Z DESCRIPTION:Title: TBA\nAbstract:\n\n\nHost: Butch\n \nNote: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T122743Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Sheng Ran\, Washington U-St. Louis TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211126T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20211111T140000 EXDATE;TZID=America/New_York:20211118T140000 EXDATE;TZID=America/New_York:20211125T140000 EXDATE;TZID=America/New_York:20211021T140000 EXDATE;TZID=America/New_York:20210930T140000 EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20211104T140000 EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211028T140000 DTSTAMP:20220808T214455Z UID:757643anvruokbd5bj2p1rc17a@google.com CREATED:20210924T122633Z DESCRIPTION: LAST-MODIFIED:20210924T122633Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211119T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20211104T140000 EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211021T140000 EXDATE;TZID=America/New_York:20211111T140000 EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20211028T140000 EXDATE;TZID=America/New_York:20210930T140000 DTSTAMP:20220808T214455Z UID:7e32v5dj8kg84fh3s0aoksijf1@google.com CREATED:20210924T122545Z DESCRIPTION:Title: TBA\nAbstract:\n\n\nHost: TBA\n \nNote: there will NOT b e receptions prior to the talk until further notice. LAST-MODIFIED:20210924T122545Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Brenden Ortiz\, UC Santa Barbara TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211112T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20211104T140000 EXDATE;TZID=America/New_York:20211021T140000 EXDATE;TZID=America/New_York:20210930T140000 EXDATE;TZID=America/New_York:20211028T140000 EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20211014T140000 DTSTAMP:20220808T214455Z UID:60ve4r7fj59rgcs9pjjsum2rsh@google.com CREATED:20210924T122442Z DESCRIPTION:Title: TBA\nAbstract: TBA\n\n\nHost: Paglione\n \nNote: there w ill NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T122442Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Peter Hirschfeld\, University of Florida TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211105T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20210930T140000 EXDATE;TZID=America/New_York:20211028T140000 EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211021T140000 EXDATE;TZID=America/New_York:20211104T140000 EXDATE;TZID=America/New_York:20211007T140000 DTSTAMP:20220808T214455Z UID:6jukmobun1ouhbd0k23c5kko2j@google.com CREATED:20210924T122035Z DESCRIPTION:NO QMC COLLOQUIUM THIS WEEK LAST-MODIFIED:20210924T122035Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY: TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211029T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20211021T140000 EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20210930T140000 DTSTAMP:20220808T214455Z UID:0v6nmv83sdjqu7f84eiegc9pai@google.com CREATED:20210924T121945Z DESCRIPTION:Title: TBA\nAbstract:\n\n\nHost: Takeuchi\n \nNote: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T121945Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Gen Yin\, Georgetown University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211211T045959Z;BYDAY=TH EXDATE;TZID=America/New_York:20210930T140000 EXDATE;TZID=America/New_York:20211104T140000 EXDATE;TZID=America/New_York:20211111T140000 EXDATE;TZID=America/New_York:20211014T140000 EXDATE;TZID=America/New_York:20211125T140000 EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20211118T140000 EXDATE;TZID=America/New_York:20211202T140000 EXDATE;TZID=America/New_York:20211209T140000 EXDATE;TZID=America/New_York:20211028T140000 DTSTAMP:20220808T214455Z UID:7mcnlahfqn2ic1ebheevnj7gs9@google.com CREATED:20210924T121413Z DESCRIPTION:Speaker: TBA\n\n\nTitle: TBA\nAbstract:\n\n\nHost: TBA\n \nNote : there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T121413Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211015T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20211007T140000 EXDATE;TZID=America/New_York:20210930T140000 DTSTAMP:20220808T214455Z UID:2n7gfg0fjrtujinjjludroip31@google.com CREATED:20210924T121251Z DESCRIPTION:Title: TBA\nAbstract: TBA\n\n\nHost: Paglione\n \nNote: there w ill NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T121251Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Vlad Pribiag\, University of Minnesota TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211008T035959Z;BYDAY=TH EXDATE;TZID=America/New_York:20210930T140000 DTSTAMP:20220808T214455Z UID:4a4f7v7a715rs49hagpiqabcmc@google.com CREATED:20210924T121100Z DESCRIPTION:Title:  Searching for flat bands in kagome lattice metals
     < br>Abstract: 

    The two-dimensionalkagome lattice model—aside from playing a central part in the context ofmagnetic frustration—has long provided a f ruitful theoretical ground for the studyof topological and correlated elect ronic phases\, thanks to its peculiar bandfeatures including Dirac fermions and a dispersionless flat band. In recentyears\, a growing family of trans ition element-based intermetallic compoundstermed “kagome metals” are exper imentally identified to realize these characteristickagome band features. H ere I will introduce our efforts to search for flatbands in the vicinity of the Fermi level in kagome metals based particularly onlate 3d transition e lements (Fe\, Co\, Ni) [1-3]. I will discuss the implicationof these flat b ands on magnetism and highlight the essential role of d-orbitaldegrees of f reedom therein—insights from which we anticipate to be applicableto designi ng flat bands in broader classes of crystalline materials.

    [1]M. Kang \, LY et al.\, Dirac fermions and flat bands in the ideal kagome metalFeSn\ , Nat. Mater. 19\, 163-169 (2019).

    [2]M. Kang et al.\, Topological fl at bands in the frustrated kagome lattice CoSn\,Nat. Commun. 11\, 4004 (202 0).

    [3]LY et al.\, A flat band-induced correlated kagome metal\, arXi v/2106.10824


    Host: Paglione
     
    Note: there will NOT be receptio ns prior to the talk until further notice. LAST-MODIFIED:20210924T121100Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: Linda Ye\, Stanford University TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210909T140000 DTEND;TZID=America/New_York:20210909T153000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211001T035959Z;BYDAY=TH DTSTAMP:20220808T214455Z UID:61pomjs6tmmolr68r2ctdphsbl@google.com CREATED:20210924T120935Z DESCRIPTION:

    Strongly Driven Quantum Materials   

    David Hsieh

    California I nstitute of Technology

    Driving strongly correlatedel ectron systems far from equilibrium can lead to fundamentally new many-body phenomena that are thermally inaccessible. In this talk\, I will describe a series of recent experiments that leverage advanced ultrafast optical spect roscopictechniques to uncover transient properties of Mott insulators drive n by intenseelectromagnetic fields. By tailoring the characteristics of the electromagneticfield\, I will show how different out-of-equilibrium phenom ena can beselectively realized. In particular\, I will highlight the contro l of magneticorder using resonant driving\, the nonlinear production of ele ctron-hole pairsvia off-resonant driving\, and coherent “Floquet” engineeri ng of electronic bandstructures and optical properties via far off-resonant driving.   


    Host: PAGLIONE

    This seminar will be broad case via ZOOM:
    https://umd.zoom.us/s/91301075848 LAST-MODIFIED:20210924T120935Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM (zoom): David Hsieh\, Caltech TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211005T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210927T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20210913T160000 DTSTAMP:20220808T214455Z UID:1niue4e9laaniqhk30svmt9cf5@google.com CREATED:20210924T115045Z DESCRIPTION:Speaker 1: Haotong Liang


     
    Advisor:  Ichiro Takeuchi

    Title: In-situ Phase Dete rmination Through Deep Learning Analysis of RHEED Data


    Abstract: A k ey challenge in materials development is the ability to identify material p hase in-situ during synthesis and processing. In this talk\, we present a p hase mapping and determination method based on Reflection High Energy Elect ron Diffraction (RHEED) data as well as a basic introduction to the techniq ue itself. RHEED is an in-situ surface-structure characterization technique commonly used to observe the growth of thin films that produces diffractio n patterns containing a wealth of static and dynamic information. However\, the ability to extract this information is limited by the lack of versatil e systems for automated analysis of the patterns. We used a Deep Learning-b ased tool for automating the analysis of RHEED diffraction patterns. Our me thod combines several supervised and unsupervised learning methods and perm its the extraction of important qualitative and quantitative information ch aracterizing the structure. As a test of the developed pipeline\, we applie d it to map the phase diagram of hematite structures grown under different conditions. With the increased robustness of the information extracted from the RHEED measurements\, one would be able to attain quantitative insight as to the underlying structural phase as well as how the surface structure of a thin film is evolving during the deposition. 


    Note: there w ill NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T115045Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Haotong Liang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211130T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20211025T160000 EXDATE;TZID=America/New_York:20211011T160000 EXDATE;TZID=America/New_York:20211108T160000 EXDATE;TZID=America/New_York:20211101T160000 EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20211122T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20210927T160000 EXDATE;TZID=America/New_York:20211115T160000 EXDATE;TZID=America/New_York:20211004T160000 EXDATE;TZID=America/New_York:20211018T160000 DTSTAMP:20220808T214455Z UID:6bit2fdbcs40kg03b06pfsulvd@google.com CREATED:20210924T114100Z DESCRIPTION:Speaker 1: Jarryd Allyn Horn
    Speaker 2: Zachary Steffen

     
    Advisor:  Benjamin Palmer - Speaker 2

    Title: TBD


    Abstract: TBD

    Note: there wil l NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T114100Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Jarryd Allyn Horn/Zachary Steffen TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211109T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20211018T160000 EXDATE;TZID=America/New_York:20211101T160000 EXDATE;TZID=America/New_York:20211004T160000 EXDATE;TZID=America/New_York:20211011T160000 EXDATE;TZID=America/New_York:20211025T160000 EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20210927T160000 DTSTAMP:20220808T214455Z UID:45gl7f716mpccpshg4k9q8rd8r@google.com CREATED:20210924T113938Z DESCRIPTION:Speaker 1: Yizhou Huang



     
    Advisor: Benjamin Palmer

    Title: TBD


    Abstr act: TBD

    Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T113938Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Yizhou Huang TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211102T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20211018T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20210927T160000 EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20211011T160000 EXDATE;TZID=America/New_York:20211004T160000 EXDATE;TZID=America/New_York:20211025T160000 DTSTAMP:20220808T214455Z UID:2b9gplqqt322g9adblrqfbj9lb@google.com CREATED:20210924T113854Z DESCRIPTION:Speaker 1: 


     
    Advisor:  

    Title: 

    Abstract: LAST-MODIFIED:20210924T113854Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: No Class TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211026T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20211018T160000 EXDATE;TZID=America/New_York:20211004T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20211011T160000 EXDATE;TZID=America/New_York:20210927T160000 DTSTAMP:20220808T214455Z UID:1n38i0k8ncufh23gk9pqo6153u@google.com CREATED:20210924T113813Z DESCRIPTION:Speaker 1: Richmond Wang
    Speaker 2: Jingnan Cai


     
    Advisor:  

    Title: TBD


    Abstract: TBD

    Note: there will NOT be receptions prior to the ta lk until further notice. LAST-MODIFIED:20210924T113813Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Richmond Wang/Jingnan Cai TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211019T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20211004T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20210913T160000 EXDATE;TZID=America/New_York:20210927T160000 EXDATE;TZID=America/New_York:20211011T160000 DTSTAMP:20220808T214455Z UID:6cac7bc7fc6lnjtierpbjsgtn5@google.com CREATED:20210924T113733Z DESCRIPTION:Speaker 1: Prathum Saraf
    Speaker 2: Danila Sokratov


     
    Advisor:  Johnpierre Pa glione

    Title: TBD


    Abstract: TBD

    Note: there will NOT be rec eptions prior to the talk until further notice. LAST-MODIFIED:20210924T113733Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Prathum Saraf/Danila Sokratov TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211012T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20211004T160000 EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20210927T160000 EXDATE;TZID=America/New_York:20210913T160000 DTSTAMP:20220808T214455Z UID:45g0cnu7c2mj3vneum43g4q0m3@google.com CREATED:20210924T113653Z DESCRIPTION:Speaker 1: 



    Advisor: 

    Title: TBD


    Abstract: TBD

    Note: there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210924T113653Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C Seminar: Open TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210913T160000 DTEND;TZID=America/New_York:20210913T173000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20210928T035959Z;BYDAY=MO EXDATE;TZID=America/New_York:20210920T160000 EXDATE;TZID=America/New_York:20210913T160000 DTSTAMP:20220808T214455Z UID:60e1q9spa22353e2uc553f7lif@google.com CREATED:20210924T113330Z DESCRIPTION:

    This will be a ZOOM class:

    https://umd.zoom.us/s/97540478019 

     

     


    Note: there will NOT be receptions prior to the ta lk until further notice. LAST-MODIFIED:20210924T113330Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:PHYS838C CAREER Seminar (ZOOM): Prof. Weiwei Xie\, Rutgers Universi ty TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211001T160000Z DTEND:20211001T164500Z DTSTAMP:20220808T214455Z UID:31md6g2juj5i9drdno128lcdcg@google.com CREATED:20210924T001057Z DESCRIPTION:Title: Minimum Entanglement Protocols for Function Estimation\ nSpeaker: Jake Bringewatt (QuICS)\nTime: Friday\, October 1\, 2021 - 12:0 0pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/994841 19207\n\nWe derive a family of optimal protocols\, in the sense of saturati ng the quantum Cramér-Rao bound\, for measuring a linear combination of d f ield amplitudes with quantum sensor networks\, a key subprotocol of general quantum sensor networks applications. We demonstrate how to select differe nt protocols from this family under various constraints via linear programm ing. Focusing on entanglement-based constraints\, we prove the surprising r esult that highly entangled states are not necessary to achieve optimality for many problems. Specifically\, we prove necessary and sufficient conditi ons for the existence of optimal protocols using at most k-partite entangle d cat-like states.\n\nPizza and drinks served after the talk. LAST-MODIFIED:20210924T001057Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar:Jake Bringewatt TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210909T180000Z DTEND:20210909T193000Z DTSTAMP:20220808T214455Z UID:7779t56t1eoa141ijpe5knp5ge@google.com CREATED:20210923T174521Z DESCRIPTION:Speaker: TBA\n\n\nTitle: TBA\nAbstract:\n\n\nHost: TBA\n \nNote : there will NOT be receptions prior to the talk until further notice. LAST-MODIFIED:20210923T174522Z LOCATION:Toll Physics Rm 1201 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QMC COLLOQUIUM: TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210928T170000Z DTEND:20210928T181500Z DTSTAMP:20220808T214455Z UID:5to7osj1or66cn2pqji23he0qn@google.com CREATED:20210913T181113Z DESCRIPTION:Speaker: \; Gerhard Stock\, University of Freiburg

    T itle: \; \;Learning Biomolecular Collective Variables

    Abstract: The statistical analysis of molecular dynamics simulations requi res dimensionality reduction techniques\, which yield a low-dimensional set of collective variables x_i = x that in some sense describe the essential dynamics of the system. Considering the distribution P(x) of the collective variables\, the primal goal of a statistical analysis is to detect charact eristic features of P(x)\, in particular\, its maxima and their connection paths. This is because these features characterize the low-energy regions a nd the energy barriers of the corresponding free energy landscape\, and the refore amount to the metastable states and transition regions of the system . In this seminar\, we outline a systematic strategy to identify collective variables and metastable states\, which subsequently can be employed to co nstruct a Langevin or a Markov state model of the dynamics. In particular\, we account for the still limited sampling typically achieved by molecular dynamics simulations\, which in practice seriously limits the applicability of theories (e.g.\, assuming ergodicity) and black-box software tools (e.g .\, using redundant input coordinates). We show that it is essential to use internal (rather than Cartesian) input coordinates\, employ dimensionality reduction methods that avoid rescaling errors (such as principal component analysis)\, and perform density based (rather than k-means-type) clusterin g. Finally we discuss a machine learning approach to dimensionality reducti on\, that highlights the essential internal coordinates of a system and may reveal hidden reaction mechanisms.

    F. Sittel and G. Stock\, Perspective Article in J. Chem. Phys 149\, 150901 (2018)

    S.Brandt\, F. Sittel\, M . Ernst\, and G. Stock\, Machine Learning of Biomolecular Reaction Coordina tes\, J. Phys. Chem. Lett. 9\, 2144 (2018) \;


    Where: \;https://go.umd.edu/statphys_zoom< br>
    1:15pm (An informal pre-seminar chat with the speaker\, to which all are invited\, will be held at 1:00pm). LAST-MODIFIED:20210922T143625Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Virtual Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210927T190000Z DTEND:20210927T203000Z DTSTAMP:20220808T214455Z UID:1o598eonov07odar55i1199qer@google.com CREATED:20210824T121233Z DESCRIPTION:Speaker: Anirudh Prabhu\, Stanford\n\nTitle: Axion Production i n Pulsar Magnetosphere Gaps\n\nAbstract: Pulsar magnetospheres admit non-st ationary vacuum gaps that are characterized by non-vanishing E•B. The vacuu m gaps play an important role in plasma production and electromagnetic wave emission. We show that these gaps generate axions whose energy is set by t he gap oscillation frequency. The density of axions produced in a gap can b e several orders of magnitude greater than the ambient dark matter density. In the strong pulsar magnetic field\, a fraction of these axions may conve rt to photons\, giving rise to broadband radio signals. We show that dedica ted observations of nearby pulsars with radio telescopes (FAST) and interfe rometers (SKA) can probe axion-photon couplings that are a few orders of ma gnitude lower than current astrophysical bounds. LAST-MODIFIED:20210922T133514Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210930T150000Z DTEND:20210930T163000Z DTSTAMP:20220808T214455Z UID:254p76pbbvvm9fjl5g9b113li5@google.com CREATED:20210831T185529Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/99 485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min social h our at 11am with the seminar at 11:30am

    Speaker: Balint Toth\, Wuppe rtal

    Title: A lattice QCD perspective on the muon g-2


    Abs tract: The anomalous magnetic moment of the muon is one of the most
    prec isely measured physical quantities. Comparing its experimental
    value to the theoretical prediction of the Standard Model (SM)
    provides a stringe nt test of SM\, and a possible disagreement can
    indicate new physics. Th e Fermilab team has recently announced their
    precise measurement for thi s magnetic moment\, reporting a 4.2 sigma
    significance for new physics\, and raising the tantalizing possibility
    of physical particles or forces as yet undiscovered. However\, an
    extensive new calculation of the theo retically most controversial
    contribution\, the leading order hadronic v acuum polarization
    contribution\, using lattice QCD by the
    Budapest-M arseille-Wuppertal-collaboration\, reduces the gap between
    theory and ex periment. In this talk I will summarize the theoretical
    aspects\, and gi ve details on the lattice calculation. LAST-MODIFIED:20210922T132800Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210929T150000Z DTEND:20210929T161500Z DTSTAMP:20220808T214455Z UID:0ka4sqra06nli4odfoi7p2c0fe@google.com CREATED:20210921T152026Z DESCRIPTION:Title: Improved quantum error correction using soft informatio n
    Speaker: Nicolas Delfosse (Microsoft)
    Time: Wednesday\, September 29\, 2021 - 11:00am
    Location: Virtual Via Zoom: https://umd.zoom.us/j/96330035092

    The typi cal model for measurement noise in quantum error correction is to randomly flip the binary measurement outcome. In experiments\, measurements yield mu ch richer information - e.g.\, continuous current values\, discrete photon counts - which is then mapped into binary outcomes by discarding some of th is information. In this work\, we consider methods to incorporate all of th is richer information\, typically called soft information\, into the decodi ng of the surface code. We design soft decoders that leverage soft informat ion\, and demonstrate that these soft decoders outperform the standard (har d) decoders that can only access the binary measurement outcomes. We also i ntroduce a soft measurement error model with amplitude damping\, in which m easurement time leads to a trade-off between measurement resolution and add itional disturbance of the qubits. Under this model we observe that the per formance of the surface code is very sensitive to the choice of the measure ment time - for a distance-19 surface code\, a five-fold increase in measur ement time can lead to a thousand-fold increase in logical error rate. More over\, the measurement time that minimizes the physical error rate is disti nct from the one that minimizes the logical performance\, pointing to the b enefits of jointly optimizing the physical and quantum error correction lay ers.
    Based on joint work with Christopher Pattison\, Michael Beverland a nd Marcus da Silva.
    https://a rxiv.org/abs/2107.13589 LAST-MODIFIED:20210921T152646Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Nicolas Delfosse TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210929T150000Z DTEND:20210929T191500Z DTSTAMP:20220808T214455Z UID:2ljkihh3qhobkotdj8o2k6oj0r@google.com CREATED:20210914T153528Z DESCRIPTION:Speaker: Robert Butera\, Laboratory for Physical Sciences -&nbs p\;https://www.lps.umd.edu/

    T itle: Building Chemistry Approaches for Outstanding Challenges in Quantum C omputing

    Abstract: TBA


    Virtual: \;go.umd.edu/pchem_seminars LAST-MODIFIED:20210921T143725Z LOCATION:IPST Bldg. #085\, Room 1116 (In person) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar - Virtual/In-person TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210922T200000Z DTEND:20210922T213000Z DTSTAMP:20220808T214455Z UID:78n78i6dl96g21c1vm3ds4usgt@google.com CREATED:20210920T184638Z DESCRIPTION:Zoom Information: \;https://umd.zoom.us/j/912108 47449?pwd=Y2prQW05S29EYjZlbHZLZkNSU0JHQT09 \;

    Pass word is 300061

    Title : "C^3: An Andvanced Concept for a e+e- Linear Collider"

    Speaker Name: Emilio Allessandro Nani
    Speaker Instituti on : Stanford University

    Abstract: The goal of a next-generation e+e - collider is to carry out precision measurements to the percent level of t he Higgs boson properties that are not accessible at the LHC and HL-LHC. In this talk we will present the study of a new concept for a high gradient\, high power accelerator with beam characteristics suitable to study the Hig gs boson\, the Cool Copper Collider (C^3)\, with the goal of minimizing the capital and operating costs. C^3 is based on the latest advances in rf acc elerator technology and utilizes optimized cavity geometries\, novel rf dis tribution and operation a cryogenic temperatures to allow the linear accele rator to achieve high accelerating gradients while maintaining overall syst em efficiency. We will present the latest demonstrated performance of proto type accelerators and highlight the future development path for C^3.

    Name: Sally Megonigal
    E-Mail: \;s megonig@umd.edu LAST-MODIFIED:20210920T193539Z LOCATION:Seminar will be virtual SEQUENCE:0 STATUS:CONFIRMED SUMMARY:High Energy TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210923T150000Z DTEND:20210923T163000Z DTSTAMP:20220808T214455Z UID:7n78fh4kjv0tfr3s5g84hg843b@google.com CREATED:20210830T143021Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/99 485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min social h our at 11am with the seminar at 11:30am

    Speaker: Huey-Wen Lin\, Mich igan State \;

    Title: Mapping Nucleon Parton Distributions with L attice QCD

    Abstract: The strong force which binds hadrons is describ ed by the theory of quantum chromodynamics (QCD). Determining the character and manifestations of QCD is one of the most important and challenging out standing issues necessary for a comprehensive understanding of the structur e of hadrons. Within the context of the QCD parton picture\, the parton dis tribution functions (PDFs) have been remarkably successful in describing a wide variety of processes. However\, these PDFs have generally been confine d to the description of collinear partons within the hadron. New experiment s and facilities provide the opportunity to additionally explore the three- dimensional structure of hadrons\, which can be described by generalized pa rton
    distributions (GPDs) for example. In recent years\, a breakthrough was made in calculating the Bjorken‐x
    dependence of PDFs in lattice QCD by using large‐momentum effective theory (LaMET) and other similar framewor ks. The breakthrough has led to the emergence and rapid development of dire ct
    calculations of Bjorken-x dependent structure. LAST-MODIFIED:20210920T132604Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:TRANSPARENT END:VEVENT BEGIN:VEVENT DTSTART:20210922T150000Z DTEND:20210922T161500Z DTSTAMP:20220808T214455Z UID:0naf6b4i2riud1e9un2a6trut4@google.com CREATED:20210914T131821Z DESCRIPTION:Speaker: Aaron Rury\, Wayne State - \;https://clasprofiles.wayne.edu/profile/g k7795

    Title: Assessing Hybrid Molecular Platforms for Next Gener ation Quantum Technologies

    Abstract: \;Quantum control over ligh t and matter is poised to enable future capabilities beyond the reach of cu rrent technologies in chemical synthesis\, energy harvesting\, and informat ion processing and storage. Despite this promise\, the fundamental physical drivers of quantum control in proposed platforms remain unclear. In this t alk\, I will present results from fundamental studies of structure-property relationships in two disparate hybrid molecular systems of emerging intere st to the chemistry community. First\, I will present results from our stud ies on the chemistry and properties of mid-gap states formed in self-assemb led quantum nanostructures. These results indicate synthetic routes to the deterministic design of structural defects for the emission of narrowband l ight spectra central to solution-processed single photon sources and entang led photon generation in the established telecommunications band. Second\, I will present results in the design\, fabrication\, and characterization o f cavity polariton samples containing single and multiple chromophores. The se results suggest the entanglement of light and matter states mediated by polariton formation opens new avenues to control ultrafast molecular photop hysics and intermolecular interactions on truly quantum footing. These stud ies demonstrate the wealth of fundamental physical information \;centra l to the development of next generation molecular quantum technologies  \;that can be attained from informed materials design and advanced spectros copic characterization.

    Where: \;http://go.umd.edu/pchem_seminars

    LAST-MODIFIED:20210916T191603Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210924T160000Z DTEND:20210924T164500Z DTSTAMP:20220808T214455Z UID:2epart1i919apop39ra990k49h@google.com CREATED:20210916T184344Z DESCRIPTION:Title: Energy absorption in chaotic billiards under rapid peri odic driving\nSpeaker: Wade Hodson (University of Maryland\, Physics)\nTim e: Friday\, September 24\, 2021 - 12:00pm\nLocation: ATL2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207\n\nIn this talk\, I will discus s chaotic billiard systems subject to a rapid periodic driving force\, with driving frequency ω. Classically\, the energy of such systems changes by s mall\, effectively random increments associated with collisions with the bi lliard wall\, leading to a random walk in energy space\, or “energy diffusi on.” I will present a Fokker-Planck description of this process. This model displays several notable features\, including a 1/ω² scaling of the energy absorption rate\, and (in certain special cases) an exact analytical solut ion. I will also present numerical results which corroborate the model. Fin ally\, I will discuss how the energy diffusion framework may be applicable to many-particle interacting systems\, as well as to quantum billiards in t he semiclassical limit.\n\nPizza and drinks served after the talk. LAST-MODIFIED:20210916T184344Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Wade Hodson TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210917T160000Z DTEND:20210917T164500Z DTSTAMP:20220808T214455Z UID:4pl55ro2hbcrlhgnk040vq8e70@google.com CREATED:20210915T022522Z DESCRIPTION:Title: Quantum simulations of non-ergodic phenomena with trapp ed ions\nSpeaker: Will Morong (JQI)\nTime: Friday\, September 17\, 2021 - 12:00pm\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/9 9484119207\n\nRecent years have seen the development of isolated quantum si mulator platforms capable of exploring interesting questions at the frontie rs of many-body physics. We describe our platform\, based on a chain of Ytt erbium ions in a linear trap\, and describe its capabilities\, which includ e long-range spin-spin interactions and single-site manipulation and readou t. We then describe some recent studies undertaken with this machine\, focu sing on two. The first is the observation of domain-wall confinement\, in w hich the long-range interactions cause individual domain walls to become bo und into meson-like quasiparticles. The second\, observation of Stark many- body localization\, in which a linearly increasing gradient halts thermaliz ation in favor of a state similar to disorder-induced many-body localizatio n. Finally\, we discuss these observations through the lens of Hilbert spac e fragmentation\, which may provide a unifying framework for these distinct forms of ergodicity breaking.\n\nPizza and drinks served after the talk. LAST-MODIFIED:20210915T022522Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Will Morong TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211103T150000Z DTEND:20211103T161500Z DTSTAMP:20220808T214455Z UID:6mptpa57efk3neceuiurkqf5r8@google.com CREATED:20210914T155205Z DESCRIPTION:Speaker: Michael Ritter\, Mullin Group

    Title: Literature Seminar

    Abstract: TBA LAST-MODIFIED:20210914T155205Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211013T150000Z DTEND:20211013T161500Z DTSTAMP:20220808T214455Z UID:17k8hkh1b2ml3jq4ro0o3vsose@google.com CREATED:20210914T154602Z DESCRIPTION:Speaker: Nicholas Fisher\, Fourkas Group

    Title: Literatu re Seminar

    Abstract: TBA LAST-MODIFIED:20210914T154602Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211019T170000Z DTEND:20211019T180000Z DTSTAMP:20220808T214455Z UID:2gdah8nga3j89g7v6me2rkb7q6@google.com CREATED:20210914T151748Z DESCRIPTION: LAST-MODIFIED:20210914T151748Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211126T180000Z DTEND:20211126T190000Z DTSTAMP:20220808T214455Z UID:2ubf5b3pqbga3ted3qn9ij1kkn@google.com CREATED:20210914T151329Z DESCRIPTION: LAST-MODIFIED:20210914T151329Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science & Engineering Seminar - NO SEMINAR - HAPPY THANKS GIVING BRESAK TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211029T170000Z DTEND:20211029T180000Z DTSTAMP:20220808T214455Z UID:5hupc0479muq7atrat72sa5dl0@google.com CREATED:20210914T150711Z DESCRIPTION:Speaker: Raymundo Arroyave\, Professor\, Materials Science & En gineering\, Texas A&M University\n\nTitle: Bayesian Materials Discovery Fra meworks\n\nAbstract: Over the last decade\, there has been a paradigm shift away from labor-intensive and time-consuming materials discovery methods\, and materials exploration through informatics approaches is gaining tracti on at present. Current approaches are typically centered around the idea of achieving this exploration through high-throughput (HT) experimentation/co mputation. Such approaches\, however\, do not account for the practicalitie s of resource constraints\, which eventually result in bottlenecks at vario us stages of the materials discovery/design workflow. Regardless of how man y bottlenecks are eliminated\, the fact that ultimately a human must make d ecisions about what to do with the acquired information implies that HT fra meworks face hard limits that will be extremely difficult to overcome. Rece ntly\, this problem has been addressed by framing the materials discovery p rocess as an optimal experiment design problem. In this talk\, I will discu ss the need for optimal experiment design\, the challenges in its implement ation and finally discuss some successful examples of materials discovery v ia experiment design. Specifically\, I will discuss some recent examples in which my group and collaborators have demonstrated: (i) Multi-objective ma terials discovery and design\; (ii) Bayesian optimization under model uncer tainty (BOMU)\; (iii) Multi-source information fusion Bayesian optimization for materials design\; (iv) Batch Bayesian optimization applied to microst ructure sensitive design of materials. LAST-MODIFIED:20210914T150711Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211015T170000Z DTEND:20211015T180000Z DTSTAMP:20220808T214455Z UID:2qpbt9romuf4ldo1ei00qfdb94@google.com CREATED:20210914T145928Z DESCRIPTION:Speaker: Carles Corbella\, Professor\, Mechanical & Aerospace E ngineering\, George Washington University\n\nTitle: Synthesis of Nanomateri als by Atmospheric Arc Plasmas\n\nAbstract: The Micro-Propulsion and Nanote chnology Laboratory at the George Washington University is aimed to expand the understanding of plasma and nanoscale phenomena. The research is based on three plasma-related applications: (1) propulsion by micro-thrusters\, ( 2) plasma medicine to address cell migration and cancer therapy\, and (3) p lasma-based nanotechnology. After a brief introduction to each line\, I wil l focus on nanotechnology research and the application of atmospheric plasm as to synthesize nanomaterials like graphene\, carbon nanotubes\, and MoS2 monolayers. The plasma-healing effect of anodic arc discharges and the inve stigation of pulsed arcs to tailor nanoparticle growth constitute the up-to -date highlights of the research line. The next challenge is the production of advanced nanostructures with tunable electrical and optical properties using arc plasma and other environmentally friendly techniques. LAST-MODIFIED:20210914T145928Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211008T170000Z DTEND:20211008T180000Z DTSTAMP:20220808T214455Z UID:7hpljg8la6k200c3suemp7tl25@google.com CREATED:20210914T145728Z DESCRIPTION:Speaker: Shu Yang\, Professor and Chair\, Materials Science and Engineering\, University of Pennsylvania\n\nTitle: Kirgami: Programming\, Cutting and Folding from Microscale to Meter Scale\n\nAbstract: Programmabl e shape-shifting materials can take different physical forms to achieve mul tifunctionality in a dynamic and controllable manner. By introducing holes and cuts in 2D sheets macroscopically\, we demonstrate dramatic shape chang e and super-conformability via expanding or collapsing of the hole arrays w ithout deforming individual lattice units. When choosing the cuts and geome try correctly\, we show folding into the third dimension\, known as kirigam i. By programming the geometry of cuts and folding angles\, we explore thei r potential applications in solar shading\, water harvesting\, super-stretc hable and shape conformable medical devices. LAST-MODIFIED:20210914T145728Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210924T170000Z DTEND:20210924T180000Z DTSTAMP:20220808T214455Z UID:0kkonr7tj4r1gd9fp0867cv303@google.com CREATED:20210914T145104Z DESCRIPTION:Speaker: Ismaila Dabo\, Associate Professor\, Materials Science & Engineering\, Penn State University\n\nTitle: First-Principles Optimizat ion and Discovery of Materials for Energy Conversion and Storage\n\nAbstrac t: Materials innovations require considerable time and resources.This prese ntation will discuss the use of first-principles modeling for optimizing th e properties of materials over relevant time and length scales and for narr owing down the choice of candidate materials for target applications. The f ocus will be on minimizing heat transport in thermoelectric semiconductors and on producing hydrogen fuels photocatalytically by cleaving water molecu les under solar illumination. An overview of the state of the art in electr onic-structure calculations will be given and progress in overcoming the si ze and accuracy limits of these techniques will be highlighted. LAST-MODIFIED:20210914T145104Z LOCATION:2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210921T170000Z DTEND:20210921T181500Z DTSTAMP:20220808T214455Z UID:2t2e9n5iahuk25t8aeljfnj077@google.com CREATED:20210913T141552Z DESCRIPTION:Speaker: David Sivak\, Simon Fraser University

    Title: In formation Thermodynamics of the Transition-Path Ensemble

    Abstract: T he reaction coordinate describing a transition between reactant and product is a fundamental concept in the theory of chemical reactions. Within trans ition-path theory\, a quantitative definition of the reaction coordinate is found in the committor\, which is the probability that a trajectory initia ted from a given microstate first reaches the product before the reactant. Here we develop an information-theoretic origin for the committor and show how selecting transition paths from the equilibrium ensemble induces entrop y production which exactly equals the information that system dynamics prov ide about the reactivity of trajectories. This equality of entropy producti on and dynamical information generation also holds at the level of arbitrar y individual coordinates\, providing parallel measures of the coordinate's relevance to the reaction\, each of which is maximized by the committor.&nb sp\;

    Where: \;https://go.umd.edu/statphys_zoom LAST-MODIFIED:20210914T125840Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY: Informal Statistical Physics Virtual Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211207T180000Z DTEND:20211207T190000Z DTSTAMP:20220808T214455Z UID:65et30f4dqjktdttb6oll4lkkh@google.com CREATED:20210913T184555Z DESCRIPTION: LAST-MODIFIED:20210913T184606Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211130T180000Z DTEND:20211130T190000Z DTSTAMP:20220808T214455Z UID:1544inefe6ldc94mkivvolr7qs@google.com CREATED:20210913T184519Z DESCRIPTION: LAST-MODIFIED:20210913T184519Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211123T180000Z DTEND:20211123T191500Z DTSTAMP:20220808T214455Z UID:6imdtki9ch18garohh2p5o96vl@google.com CREATED:20210913T184427Z DESCRIPTION: LAST-MODIFIED:20210913T184452Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210914T170000Z DTEND:20210914T181500Z DTSTAMP:20220808T214455Z UID:7g73cl5ek7hh7lhs51cn65i0qh@google.com CREATED:20210909T122200Z DESCRIPTION:Speaker: Joan-Emma Shea\, University of California\, Santa Barb ara

    Title: Self-Assembly of the Tau Protein: Liquid-Liquid Phase Sep aration and Fibril Formation

    Abstract: Intrinsically disordered pept ides (IDP) are a special class of proteins that do not fold to a unique thr ee-dimensional shape. These proteins play important roles in the cell\, fro m signaling to serving as structural scaffolds. Under pathological conditio ns\, they can self-assemble into structures that are toxic to the cell\, an d a number of neurodegenerative diseases are associated with this self-asse mbly process. My talk will focus on the Tau protein\, an IDP that binds to microtubules and can form fibrillar aggregates\, a process that has been li nked with Alzheimer’s disease. In addition to forming fibrils\, the Tau pro tein can also phase separate into a protein rich and a protein depleted pha se\, a process known as liquid-liquid phase separation (LLPS). This process may play a protective role in the cell against pathological fibrillization . I will present molecular dynamics and field theoretic simulations that ma p out the phase diagram for Tau LLPS\, and use this phase diagram to predic t the conditions under which Tau can be driven towards LLPS under \; live \;cell coculturing conditions.

    This is a Virtual Sem inar \;https://go.umd.edu/statphys_zoom

    An inform al pre-seminar chat with the speaker\, to which all are invited\, will be h eld at 1:00pm LAST-MODIFIED:20210913T184242Z LOCATION: SEQUENCE:2 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Virtual Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210910T173000Z DTEND:20210910T183000Z DTSTAMP:20220808T214455Z UID:4loe9q0b7q8c7u6v4kr6lftrol@google.com CREATED:20210816T144315Z DESCRIPTION:**Joint Cornell/ UMD Seminar**

    Speaker: Andreas K arch\, University of Texas\, Austin

    Seminar will be conducted via zo om

    Preceded by zoom lunch at 12:30pm.

    Title: "Branes\, Islands\, and Massive Gravitons"

    Abstract: Recent progress in our understanding of black hole evaporatio n has mostly occurred in the context of black holes coupled to an external\ , non-gravitating bath. In order to compare and contrast to what happens to black holes in asymptotically flat space it is imperative to understand wh ether the non-gravitating bath is just some external spectator or actively changes the physics of the system. We show how Randall-Sundrum braneworlds\ , and their holographic interpretation\, provide us with the tools to answe r this important question.

    Seminar Slides LAST-MODIFIED:20210913T184241Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint Cornell/ UMD Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211116T180000Z DTEND:20211116T190000Z DTSTAMP:20220808T214455Z UID:2v8r9kersd5j47q5nnaqe11vbd@google.com CREATED:20210913T184038Z DESCRIPTION: LAST-MODIFIED:20210913T184038Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20211109T180000Z DTEND:20211109T190000Z DTSTAMP:20220808T214455Z UID:669gk3ag536to9f785ba4en1ha@google.com CREATED:20210913T184010Z DESCRIPTION: LAST-MODIFIED:20210913T184010Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210920T190000Z DTEND:20210920T203000Z DTSTAMP:20220808T214455Z UID:05jdg3u3setic6b4qcgb470bba@google.com CREATED:20210805T130601Z DESCRIPTION:Speaker: Manuel Buen-Abad\, UMD\n\nTitle: New developments in axion physics: challenges from the muon g-2 and echoes of supernova remnant s. \n\n\nAbstract: New physics around the weak scale could be behind the di screpancy between the muon g-2 measurement and the Standard Model predictio n. Loop effects coming from a heavy axion-like particle coupling to leptons and photons could explain this discrepancy. We provide an updated analysis of the necessary couplings\, including two-loop contributions\, and find t hat the new physics operators point to an axion decay constant on the order of 10s of GeV. This poses major problems for such an explanation\, as the axion couplings to leptons and photons must be generated at low scales. We outline some possibilities for how such couplings can arise\, and find that these scenarios predict new charged matter at or below the weak scale and new scalars that can mix with the Higgs boson\, raising numerous phenomenol ogical challenges. If time permits\, we will change tack and consider axion dark matter searches relying on its decays into photons\, stimulated by su pernova remnants. LAST-MODIFIED:20210913T175622Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210917T170000Z DTEND:20210917T180000Z DTSTAMP:20220808T214455Z UID:4vo7k949m1i6mgkgqmroauqtmu@google.com CREATED:20210909T124558Z DESCRIPTION:Speaker: Elizabeth C. Dickey\, Professor &\; Unit Head\, Mat erials Science &\; Engineering\, Carnegie Mellon University

    Title : Point Defect Engineering in Metal Oxides

    Abstract: \;https://mse .umd.edu/event/16601/ LAST-MODIFIED:20210909T124558Z LOCATION:Room 2110 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210915T140000Z DTEND:20210915T150000Z DTSTAMP:20220808T214455Z UID:0mipf897jrschfi7sgvv7agivq@google.com CREATED:20210909T122828Z DESCRIPTION:Speaker: Literature seminar for Eric Crump (Mullin group)\n\nTi tle: TBD\n\nAbstract: TBD LAST-MODIFIED:20210909T122828Z LOCATION:IPST Bldg. #085\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210916T193000Z DTEND:20210916T203000Z DTSTAMP:20220808T214455Z UID:267dv9o5q8emttosn3us002qmv@google.com CREATED:20210716T190107Z DESCRIPTION:Zoom: https://umd.z oom.us/j/92659169552

    Title: Climate Change and Extreme Summer W eather Events

    Abstract: In addition to well-established direct physi cal linkages between a warming planet and extreme summer weather events suc h as floods\, droughts\, heat waves and wildfires are more tenuous but pote ntially profound linkages tied to altered characteristics of the Northern H emisphere jet stream and associated wave disturbances. Some of the most sig nificant extreme summer weather events in recent years have been associated with high-amplitude quasi-stationary Rossby waves with zonal wavenumbers 6 -8 tied to the phenomenon of Quasi-Resonant Amplification (QRA). Current st ate-of-the-art (CMIP5) climate models are unable to adequately resolve this mechanism owing to substantial errors in the models in the curvature of th e zonal velocity field which is a key quantity controlling the associated w ave disturbances. A reliable fingerprint for the occurrence of QRA can\, ho wever\, be defined in terms of the zonally-averaged surface temperature fie ld. Examining climate observations and historical (CMIP5) climate model sim ulations\, we have demonstrated consistent evidence for an increasing trend in QRA events over the past half century tied to anthropogenic warming. Ex amining CMIP5 model projections we find that QRA-related extreme weather ev ents are likely to increase by ~50% this century under business-as-usual ca rbon emissions\, but there is considerable variation among climate models\, and a reduction in mid-latitude aerosol loading could actually lead to Arc tic de-amplification this century\, ameliorating potential further increase s in persistent extreme weather events. Given the uncertainties\, substanti al further increases in these events cannot however be ruled out.

    Bi o: Dr. Michael E. Mann is Distinguished Professor of Atmospheric Science at Penn State\, with joint appointments in the Department of Geosciences and the Earth and Environmental Systems Institute (EESI). He is also director o f the Penn State Earth System Science Center (ESSC). Dr. Mann was a Lead Au thor on the Observed Climate Variability and Change chapter of the Intergov ernmental Panel on Climate Change (IPCC) Third Scientific Assessment Report in 2001 and was organizing committee chair for the National Academy of Sci ences Frontiers of Science in 2003. He has received a number of honors and awards including NOAA's outstanding publication award in 2002 and selection by Scientific American as one of the fifty leading visionaries in science and technology in 2002. He contributed\, with other IPCC authors\, to the a ward of the 2007 Nobel Peace Prize. Dr. Mann is author of more than 200 pee r-reviewed and edited publications\, numerous op-eds and commentaries\, and five books.

    https://en.wikipedia.org/wiki/Michael_E._Mann

    A popular article in Scientific American about jet streams\, March 2019
    https://www.scientificamerican.com/article/drough ts-and-floods-may-level-off-until-2050-but-then-watch-out/

    Talk details: https://aosc.umd.edu/events/aosc-seminar-dr-michael-mann-9162021< /a> LAST-MODIFIED:20210908T220223Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Michael Mann/Joint talk with AOSC TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210922T190000Z DTEND:20210922T200000Z DTSTAMP:20220808T214455Z UID:4ja7d2c06msvqe5ai0c3bm8qtt@google.com CREATED:20210907T162051Z DESCRIPTION:Seminar will be conducted via zoom: https:// umd.zoom.us/j/99307158788

    Speaker: Phuc Nguyen\, Lehman College\ , CUNY and University of Haifa \;

    Title: \;
    Modular Hamil tonians of excited CFT states

    Abstract:
    We consider excited state s in a conformal field theory\, obtained by applying a weak unitary perturb ation to the vacuum\, and study the corresponding modular Hamiltonian for t he Rindler half-space. The perturbation is generated by the integral of a l ocal operator \;of modular weight n over a spacelike surface passing th rough x = 0. We find that if the perturbation has support at the boundary\, then in addition to bulk terms the modular Hamiltonian has a novel contrib ution which \;takes the form of an integral over the Rindler horizon of a linear combination of the perturbing operator \;and its descendants.  \;We briefly comment on the implications for holography. LAST-MODIFIED:20210908T132933Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:Online Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210830T150000 DTEND;TZID=America/New_York:20210830T163000 RRULE:FREQ=WEEKLY;UNTIL=20211221T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20211115T150000 EXDATE;TZID=America/New_York:20211213T150000 EXDATE;TZID=America/New_York:20211220T150000 EXDATE;TZID=America/New_York:20210913T150000 EXDATE;TZID=America/New_York:20211018T150000 EXDATE;TZID=America/New_York:20211101T150000 EXDATE;TZID=America/New_York:20210920T150000 EXDATE;TZID=America/New_York:20211108T150000 EXDATE;TZID=America/New_York:20210927T150000 EXDATE;TZID=America/New_York:20210906T150000 EXDATE;TZID=America/New_York:20210830T150000 EXDATE;TZID=America/New_York:20211011T150000 EXDATE;TZID=America/New_York:20211004T150000 EXDATE;TZID=America/New_York:20211206T150000 EXDATE;TZID=America/New_York:20211122T150000 EXDATE;TZID=America/New_York:20211025T150000 DTSTAMP:20220808T214455Z UID:585k1d3fbanr7t31kj3oqqkcr9@google.com CREATED:20210908T132458Z DESCRIPTION:Seminar will be conducted via zoom.\n\nSpeaker: Patrick Draper\ , University of Chicago\n\nTitle and Abstract: tk\n\nFor zoom link please e mail mknouse@umd.edu LAST-MODIFIED:20210908T132458Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210920T203000Z DTEND:20210920T213000Z DTSTAMP:20220808T214455Z UID:3du0ehicip3ak5um4sgqj3ut34@google.com CREATED:20210908T024510Z DESCRIPTION:Title: The Earth's Dynamical Radiation Belts: Recent results fr om the Van Allen Probes mission

    Speaker: Shri Kanekal\, NASA Goddard Space Flight Center

    Abstract: The Earth’s radiation belts first dis covered by James Van Allen and named after him\, comprise charged particles trapped in the geomagnetic field. There are two belts separated by the so- called slot region. The outer belt contains chiefly electrons whose intensi ties are highly variable\, being affected by multiple processes of energiza tion and loss. These processes include radial transport\, and wave-particle interactions. The study of these processes is interesting not only scienti fically but also has practical consequences since high intensities of energ etic particles can adversely affect spacecraft and humans in space.
    The Van Allen Probes\, a major NASA mission was launched late August 2012 to st udy the radiation belts in a comprehensive manner. The mission which operat ed until Summer-Fall of 2019\, comprised two identically instrumented space craft carrying a comprehensive suite of instruments that characterize charg ed particles\, electric and magnetic fields\, and plasma waves in the Earth 's radiation belts. In particular\, the ECT suite of instruments comprising of HOPE\, MagEIS and REPT instruments measure electrons\, protons and ions and their angular distributions over energies ranging from a few eV to sev eral tens of MeV. Measurements from Van Allen Probes have made significant and paradigm-shifting contributions towards the understanding of the physic s of charged particles in the Earth's radiation belts.
    I will describe t he Van Allen Probes mission emphasizing the ECT instrument suite and presen t some of the significant science results pertaining to the dynamics of ele ctron energization and loss in the outer radiation belt. \;

    Note s: Visit https://bit.ly/2PmJoT6 \; for access
    LAST-MODIFIED:20210908T024510Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210916T150000Z DTEND:20210916T163000Z DTSTAMP:20220808T214455Z UID:5l39c8kvvoie5b23s94vh9vvpq@google.com CREATED:20210819T143413Z DESCRIPTION:Seminar will be conducted via zoom: https://umd.zoom.us/j/99 485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    A 30 min social h our at 11am with the seminar at 11:30am

    Speaker: Matthias Schindler\ , University of South Carolina

    Title: Nucleon-nucleon interactions a nd the large-Nc expansion: Applications to symmetry violations and neutrino less double beta decay


    Abstract: The large-Nc expansion of QCD c an be applied to the nucleon-nucleon interactions. The relative sizes of di fferent terms in a general parametrization of the standard nucleon-nucleon potential match reasonably well with large-Nc expectations. I will present extensions of this approach to parity- and time-reversal-invariance-violati ng interactions\, magnetic and axial two-nucleon currents\, and to two-nucl eon operators contributing to neutrinoless double beta decay. In each case\ , the large-Nc expansion imposes constraints on the relative sizes of the l ow-energy coefficients that contribute to a given type of interaction. In t he absence of sufficient data\, these constraints may prove useful in guidi ng both experiment and theory in prioritizing where to focus our efforts to gain a better understanding of these interactions. LAST-MODIFIED:20210907T140241Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210913T190000Z DTEND:20210913T203000Z DTSTAMP:20220808T214455Z UID:0kok04iqoavq0s7n4tg5i43216@google.com CREATED:20210805T130416Z DESCRIPTION:Speaker: Jose Luis Bernal\, Johns Hopkins University\n\n\nTitle : Using line-intensity mapping to look for exotic radiative decays\n\nAbstr act: Line-intensity mapping (LIM) experiments use the integrated intensity at a given frequency\, targeting well-known spectral lines to infer the red shift of the signal and build three-dimensional maps of cosmic volumes. Sin ce these surveys exploit the information from all incoming photons\, they h ave the potential to directly observe the electromagnetic radiation produce d in exotic radiative decays\, as it would be the case of decaying dark mat ter or decays of neutrinos in the cosmic neutrino background. In both cases \, the exotic radiation will be detected as a line interloper of astrophysi cal spectral lines. I will discuss realistic and efficient strategies to de tect radiative products from exotic decays from a phenomenological approach \, focusing on the LIM power spectrum and the voxel intensity distribution\ , with an extra anisotropy and a narrowing and a shift of the distribution towards higher intensities as the most significant signatures\, respectivel y. I will show forecast sensitivities for the specific cases of axion dark matter decays and neutrino decays\, discussing implications and comparisons with alternative methods\, and highlighting the promise of LIM to contribu te to indirect dark matter searches and studies of the neutrino properties. LAST-MODIFIED:20210907T133041Z LOCATION:PSC 3150 SEQUENCE:1 STATUS:CONFIRMED SUMMARY:EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210910T160000Z DTEND:20210910T164500Z DTSTAMP:20220808T214455Z UID:6p2dc5ffln23t8dbovs5r7fu3j@google.com CREATED:20210904T025653Z DESCRIPTION:Title: All-optical noise spectroscopy of a solid-state spin\nS peaker: Dima Farfurnik (JQI)\nTime: Friday\, September 10\, 2021 - 12:00p m\nLocation: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119 207\n\nThe development of spin qubits with long coherence times for quantum information processing requires sources of spin noise to be identified and minimized. Although microwave-based spin control is typically used to extr act the noise spectrum\, this becomes infeasible when high frequency noise components are stronger than the available microwave power. Here\, we intro duce an all-optical approach for noise spectroscopy of spin qubits based on Raman spin rotation using Carr-Purcell-Meiboom-Gill (CPMG) pulse sequences . By analyzing the resulting spin dynamics\, we extract the noise spectrum of a dense ensemble of nuclear spins interacting with a quantum dot\, which has thus far only been modelled theoretically. By extracting noise spectra under varying external magnetic fields\, our Raman-based analysis provides insights for extending the spin coherence times and predicts the spin dyna mics of quantum dots. This noise spectroscopy approach could provide simila r insights on other spin systems for quantum information processing.\n\nPiz za and drinks served after the talk. LAST-MODIFIED:20210904T025653Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Dima Farfurnik TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210909T180000Z DTEND:20210909T190000Z DTSTAMP:20220808T214455Z UID:5vvgd3fen8lc0c7ele414pgfdl@google.com CREATED:20210904T025456Z DESCRIPTION:Title: Trapdoor claw-free functions in quantum cryptography\nS peaker: Carl Miller (QuICS)\nTime: Thursday\, September 9\, 2021 - 2:00pm \nLocation: Virtual Via Zoom: https://umd.zoom.us/j/91375701575\n\nTrapdoo r claw-free functions (TCFs) are central to a recent wave of groundbreaking work in quantum cryptography that was originated by U. Mahadev and other a uthors. TCFs enable protocols for cryptography that involve quantum comput ers and classical communication. In this expository talk I will present th e definition of a TCF and its variants\, and I will discuss quantum applica tions\, including the recent paper "Quantum Encryption with Certified Delet ion\, Revisited: Public Key\, Attribute-Based\, and Classical Communication " by T. Hiroka et al. (arXiv:2105.05393). LAST-MODIFIED:20210904T025456Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Carl Miller TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210909T193000Z DTEND:20210909T203000Z DTSTAMP:20220808T214455Z UID:6ro15812sf0hsvc9u23toogakj@google.com CREATED:20210903T131959Z DESCRIPTION:Title : An introduction to the Sachdev-Ye-Kitaev model
    Speaker Name: Mike Winer

    Speaker Institution : University of M aryland

    Abstract: This will be an introduction to the SYK (Sachdev-Y e-Kitaev) model. Recommended reference: the first section or two of Juan Ma ldacena and Douglas Stanford\, Comments on the Sachdev-Ye-Kitaev model\, Ph ys. Rev. D 94\, 106002 (2016)\, arXiv:1604.07818

    Host: Jonathan Rose nberg
    Host E-Mail: \;jmr@umd.edu LAST-MODIFIED:20210903T131959Z LOCATION:Kirwan Hall 1313 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMNS - Mathematics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210915T150000Z DTEND:20210915T161500Z DTSTAMP:20220808T214455Z UID:4ilgj8l2tcilv7f6an2uo3mulo@google.com CREATED:20210720T175312Z DESCRIPTION:Title: Hamiltonian Simulation Algorithms for Near-Term Quantum Hardware\nSpeaker: Toby Cubitt (University College London)\nTime: Wednes day\, September 15\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://u md.zoom.us/j/91501997651?pwd=THEyNEo4bnVkMjB5WldQTm5uait5dz09\n\nThe quantu m circuit model is the de-facto way of designing quantum algorithms. Yet an y level of abstraction away from the underlying hardware incurs overhead. I n the era of near-term\, noisy\, intermediate-scale quantum (NISQ) hardware with severely restricted resources\, this overhead may be unjustifiable. W e develop quantum algorithms for Hamiltonian simulation "one level below" t he circuit model\, exploiting the underlying control over qubit interaction s available in most quantum hardware implementations.\nTo quantify the bene fits\, we apply this to a canonical example: time-dynamics simulation of th e 2D spin Fermi-Hubbard model.\n\nUsing new error bounds for Trotter produc t formulas tailored to the non-asymptotic regime and an analysis of error p ropagation in this "sub-circuit" model\, we improve upon the previous best methods for Hamiltonian simulation by multiple orders of magnitude. E.g. fo r a 5×5 Fermi-Hubbard lattice\, we reduce the circuit depth from 800\,160 t o 440 in the best case. This brings Hamiltonian simulation\, previously bey ond reach of current hardware for non-trivial examples\, significantly clos er to being feasible in the NISQ era.\n\nReference: Clinton\, Bausch\, Cub itt\, Nature Commun. 12\, 4989 (2021)\; arXiv:2003.06886[quant-ph]\n\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/91501997651?pwd=THEyNEo4bnVkMjB5WldQTm5 uait5dz09\nMeeting ID: 915 0199 7651\nPasscode: 209773\nOne tap mobile\n+13 017158592\,\,91501997651#\,\,\,\,*209773# US (Washington DC)\n+19294362866\ ,\,91501997651#\,\,\,\,*209773# US (New York)\nDial by your location\n +1 301 715 8592 US (Washington DC)\n +1 929 436 2866 US (New York )\n +1 312 626 6799 US (Chicago)\n +1 346 248 7799 US (Housto n)\n +1 669 900 6833 US (San Jose)\n +1 253 215 8782 US (Taco ma)\nMeeting ID: 915 0199 7651\nPasscode: 209773\nFind your local number: h ttps://umd.zoom.us/u/adyrpKru3p\nJoin by SIP\n91501997651@zoomcrc.com\nJoin by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sydney)\ n103.122.167.55 (Australia Melbourne)\n149.137.40.110 (Singapore)\n64.211.1 44.160 (Brazil)\n149.137.68.253 (Mexico)\n69.174.57.160 (Canada Toronto)\n6 5.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.137.24. 110 (Japan Osaka)\nMeeting ID: 915 0199 7651\nPasscode: 209773 LAST-MODIFIED:20210903T123307Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Toby Cubitt TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210915T193000Z DTEND:20210915T203000Z DTSTAMP:20220808T214455Z UID:7kkkvh9fhkf7kj9tk2o44ac6s1@google.com CREATED:20210902T165853Z DESCRIPTION:Title : How does a co-spatial return current affect solar flare accelerated electrons?

    Speaker Name: Meriem Alaoui Abdallaoui
    Sp eaker Institution : Goddard Space Flight Center

    Abstract : Solar fla res rapidly and efficiently accelerate a tremendous number of electrons at the tops of coronal loops. These energetic electrons then propagate both to ward the interplanetary medium and toward the lower and denser solar atmosp here. Over the course of the electrons’ transport\, a co-spatial counter-st reaming return current is induced\, thereby balancing the current density. In response to the return current electric field\, a fraction of the ambien t electrons will be accelerated into the runaway regime. I will present a m odel in which an accelerated electron beam drives a steady-state\, sub-Drei cer co-spatial return-current electric field\, which locally balances the d irect beam current and freely accelerates a fraction of background (return- current) electrons. The model is self-consistent\, i.e.\, the electric fiel d induced by the co-evolution of the direct beam and the runaway current is considered. I will show how return currents affect the atmospheric thermal response to an injected electron beam\, X-ray observations and the acceler ation/injection region. The results depend on the injected beam flux densit y\, the temperature and density of the background plasma. Specifically\, I will show that (1) the return current electric field can return a significa nt number of suprathermal electrons to the acceleration region\, where they can be further accelerated to higher energies\, runaway electrons can be a few tens of percent of the return current flux returning to the nonthermal beam’s acceleration region\, (2) the energy gain of the suprathermal elect rons can be up to 10−35 keV\, (3) the heating rate in the corona can be red uced by a factor of three for medium range injected fluxes in comparison to models which neglect the runaway component.

    Host Name: Marc Swisdak
    Host E-Mail: \;swisdak@umd.edu LAST-MODIFIED:20210902T165853Z LOCATION:Location: Virtual\; contact swisdak@umd.edu for address SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Plasma Physics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210908T150000Z DTEND:20210908T161500Z DTSTAMP:20220808T214455Z UID:6v2nqpap0bgq572rtdp4uikd9f@google.com CREATED:20210831T140206Z DESCRIPTION: LAST-MODIFIED:20210902T130710Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/Joint ChemPhys Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210903T160000Z DTEND:20210903T164500Z DTSTAMP:20220808T214455Z UID:4jqt5kkeeugpr3q2b3lbh2e2nl@google.com CREATED:20210828T013824Z DESCRIPTION:Title: Overview of quantum research at UMD
    Speaker: Victor Albert (QuICS)
    Time: Friday\, September 3\, 2021 - 12:00pm
    Location: ATL 2324 and Virtual Via Zoom: https://umd.zoom.us/j/99484119207

    This short talk provides a sna pshot of opportunities in quantum science\, technology\, engineering\, and mathematics (qSTEM) at the University of Maryland College Park (UMD). The U MD quantum ecosystem consists of seven quantum institutes\, five quantum-ad jacent institutes\, and approximately 100 faculty\, split 55/45 between the ory and experiment. I organize the ecosystem into subfields: each subfield is described\, and its corresponding faculty is listed.


    Pizza a nd drinks served after the talk. This talk will start at 12:10 p.m. LAST-MODIFIED:20210902T121914Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Friday Quantum Seminar: Victor Albert TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210902T150000Z DTEND:20210902T163000Z DTSTAMP:20220808T214455Z UID:7e5u3ftjjlqpbv06dfo83msm6d@google.com CREATED:20210818T202052Z DESCRIPTION:Speaker: Yukari Yamauchi\, UMD\n\nTitle: Toward first-principle s calculation of the shear viscosity - classical and quantum approaches\n\n Abstract:\nHydrodynamics successfully describes low-energy modes of a wide class of theories including QCD in the strongly-coupled regime. Some of the low energy constants in the hydrodynamic description of QCD\, such as shea r viscosity\, are difficult to obtain from first principles on a classical computer due to the sign problem. \nOne long-standing way to address sign p roblems is to deform the contour of integration in the path integral to the complex plane. I will explain the conjectured existence of such deformed c ontours which solve the sign problem completely for a certain class of acti ons. \nQuantum computing provides an alternative way to calculate the shear viscosity without a sign problem. Two necessary building blocks of the qua ntum algorithm are the construction of the energy momentum tensor in the Ha miltonian formalism\, and a state preparation algorithm of thermal states. \nLastly\, finite volume effects are always unavoidable and particularly l arge for the foreseeable future in both classical and quantum calculations. We study such effects in molecule dynamics and $\\mathcal{N}=4$ supersymme tric Yang-Mills theory. LAST-MODIFIED:20210901T201058Z LOCATION:PSC 2136 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210914T200000Z DTEND:20210914T210000Z DTSTAMP:20220808T214455Z UID:2h1l1vfp8p8pu1jo5fc5nvdg0b@google.com CREATED:20210901T155919Z DESCRIPTION:Title: How to perform the coherent measurement of a curved pha se space\nSpeaker: Dr. Christopher Sahadev Jackson (Sandia National Labora tories)\nTime: Tuesday\, September 14\, 2021 - 4:00pm\nLocation: Virtual Via Zoom: https://uwaterloo.zoom.us/j/91715806521?pwd=QjBuWTBDODZOVitFVkV5W XU2dHhlUT09\n\nIn quantum optics\, the Hilbert space of a mode of light cor responds to functions on a plane called the phase space (so called because it reminded Boltzmann of oscillators in 2-d real space.) This corresponden ce offers three important features: it can autonomously handle quantum the oretical calculations\, it allows for the infinite-dimensional Hilbert spac e to be easily visualized\, and it is intimately related to a basic experim ental measurement (the so-called heterodyne detection). Continuous phase s pace correspondences exist naturally for many types of Hilbert space beside s this particular infinite-dimensional one. Specifically\, the two-sphere is a natural phase space for quantum spin systems. Although well studied o n the theoretical and visualization fronts\, the corresponding measurement (theoretically referred to as the spin-coherent-state positive-operator-val ued measure or SCS POVM) has yet to find a natural way to be experimentally performed. In this talk\, I will review the history of phase space\, it’s connection to representation theory\, quantization\, coherent states\, and continuous measurement. Finally\, I will explain how the SCS POVM can be simply performed\, independent of the quantization. Such a demonstration i s a fundamental contribution to the theory of continuous quantum measuremen t which revives several differential-geometric ideas from the classical and modern theory of complex semisimple Lie groups. LAST-MODIFIED:20210901T160006Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:IQC-QuICS Math-CS Seminar: Dr. Christopher Sahadev Jackson TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210910T170000Z DTEND:20210910T180000Z DTSTAMP:20220808T214455Z UID:7131iishaekc6kmilajt4m4o0f@google.com CREATED:20210831T180737Z DESCRIPTION:Speaker: Anna C. Balazs\, Professor\, Chemical Engineering\, Un iversity of Pittsburgh\n\nTitle: Chemically Controlled Shape-Morphing of El astic Sheets\n\nAbstract: Two-dimensional responsive materials that change shape into complex three-dimensional structures are valuable for creating s ystems ranging from wearable electronics to soft robotics. Typically\, the final 3D structure is unique and predetermined through the materials’ proce ssing. Using theory and simulation\, we devise a distinctive approach for driving shape changes of 2D elastic sheets in fluid-filled microchambers. T he sheets are coated with catalyst to generate controllable fluid flows\, w hich transform the sheets into complex 3D shapes. A given shape can be achi eved by patterning the arrangement of the catalytic domains on the sheet an d introducing the appropriate reactant to initiate a specific catalytic rea ction. Moreover\, a single sheet that encompasses multiple catalytic domain s can be transformed into a variety of 3D shapes through the addition of on e or more reactants. Materials systems that morph on-demand into a variety of distinct structures can simplify manufacturing processes and broaden the utility of soft materials. LAST-MODIFIED:20210831T180737Z LOCATION:CHE 2108 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210903T170000Z DTEND:20210903T180000Z DTSTAMP:20220808T214455Z UID:5m3nlj7f1d693tjl2j84ma2nqf@google.com CREATED:20210831T180126Z DESCRIPTION:Speaker: Mary Dorman\, UMD Assistant Director of Environmental Safety\n\nTitle: Safety in the Workplace\n\nAbstract: "Work safely." A simp le two-word directive. But how do you know that you have accounted for all hazards and risks? In this seminar\, we will present the American Chemical Society's RAMP method. A simple approach to Recognize hazards\, Assess risk \, Minimize risk\, and Prepare for Emergencies. We will focus on hazards an d risks specific to the Department of Materials Science and Engineering Lab s. Providing a successful approach to "work safely." LAST-MODIFIED:20210831T180126Z LOCATION:2108 CHE SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Materials Science and Engineering Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210902T193000Z DTEND:20210902T203000Z DTSTAMP:20220808T214455Z UID:77b4gff8h0mj12p8l4m2ijvk0s@google.com CREATED:20210831T140623Z DESCRIPTION:Title: RIT on Geometry and Physics

    Abstract: This is an interdisciplinary learning seminar on topics of mutual interest to physicis ts and mathematicians. We will pick a topic for this year and decide how to approach it. Physics students\, postdocs\, and faculty are all welcome. To pics from previous years have included string theory\, supersymmetry\, topo logical states of matter\, and the AdS/CFT correspondence.

    Host: Jon athan Rosenberg
    Host E-Mail: \;jmr@umd. edu LAST-MODIFIED:20210831T140623Z LOCATION:Kirwan Hall Room 1313 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Colloquia/Seminar - CMNS Mathematics TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210907T171500Z DTEND:20210907T181500Z DTSTAMP:20220808T214455Z UID:5m0oupunjrot7rvgivoepbhkcp@google.com CREATED:20210831T140056Z DESCRIPTION: LAST-MODIFIED:20210831T140056Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210901T150000Z DTEND:20210901T160000Z DTSTAMP:20220808T214455Z UID:4rrn1rj66gds25rjnvupse7rce@google.com CREATED:20210826T190528Z DESCRIPTION:Speaker: Stefanie Milam\, NASA\, GSFC

    Title: Probing the Formation of Complex Organics in Cometary Ices: A New Laboratory Approach< br>
    Abstract: Web: \;https://science.gsfc.nasa.go v/sed/bio/stefanie.n.milam LAST-MODIFIED:20210831T140021Z LOCATION:IPST Bldg.\, Room 1116 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Phys/ANE/ChemPhys Joint Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210831T171500Z DTEND:20210831T181500Z DTSTAMP:20220808T214455Z UID:41m2tnvogrbbp2s0odjg80jrkb@google.com CREATED:20210831T135806Z DESCRIPTION: LAST-MODIFIED:20210831T135806Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - NO SEMINAR TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210908T150000Z DTEND:20210908T161500Z DTSTAMP:20220808T214455Z UID:3luj11ckeenbmoudss9i0notjb@google.com CREATED:20210831T135425Z DESCRIPTION:Title: Learnability of Hamiltonians from quantum many-body Gib bs states\nSpeaker: Anurag Anshu (University of California\, Berkeley)\nTi me: Wednesday\, September 8\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/98711584067 Meeting ID: 987 1158 4067\n\nWe will con sider the problem of learning the Hamiltonian of a quantum many-body system given samples from its Gibbs (thermal) state. The classical analog of this problem\, known as learning graphical models or Boltzmann machines\, is a well-studied question in machine learning and statistics. This talk will de scribe a sample-efficient algorithm for the quantum Hamiltonian learning pr oblem at all constant temperatures. In particular\, we prove that polynomia lly many samples in the number of particles (qudits) are necessary and suff icient for learning the parameters of a spatially local Hamiltonian in l_2- norm. Our main contribution is in establishing the strong convexity of the log-partition function of quantum many-body systems. In the process\, we pr ove a lower bound on the variance of quasi-local operators with respect to the Gibbs state\, which may be of independent interest. LAST-MODIFIED:20210831T135526Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Seminar: Anurag Anshu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210920T200000Z DTEND:20210920T210000Z DTSTAMP:20220808T214455Z UID:016q397qguma2vtfk8iu6m2tfa@google.com CREATED:20210826T200851Z DESCRIPTION:

    Title: \;Polymer Physics: From Mucus Hy drogel to Adaptive Soft Materials

    Speaker: \; Liheng Cai\, University of Virginia

    Hosted by:&n bsp\;Gregg Duncan

    Abstract: Synthetic rubber and bio logical hydrogels are dramatically different\, but their properties and fun ctions are largely determined by the structure and architecture of polymers \, the common components of both systems. Such a deterministic correlation poses opportunities in the field of polymer physics. In this talk\, I will discuss how the concepts and knowledge of polymer physics help understand b iological questions\, which\, in turn\, inspires the design of new soft fun ctional materials. First\, I will discuss the biophysical roles of mucus hy drogel in human lung defense. I will discuss how pathologically relevant bi ophysical parameters of mucus can help understand interactions among mucus\ , extracellular matrix\, and epithelial cells – the three major components of human lung defense. Second\, inspired by the structure of constituent mo lecules of mucus\, I will show the development of adaptive\, reversible\, s oft\, yet solvent-free materials with mechanical properties matching those of watery biological tissues. Further\, I will show the usage of these soft materials as a new class of inks for additive manufacturing. I will also d iscuss immediate applications and emerging challenges stimulated by these d iscoveries.

    Bio: \;Liheng Cai is an Assistant Pr ofessor at the University of Virginia\, where he currently holds joint appo intments to the Department of Materials Science and the Department of Chemi cal Engineering\, and a courtesy appointment to the Department of Biomedica l Engineering. He received his Ph.D. in Materials Science from the Universi ty of North Carolina\, where he researched with Prof. Michael Rubinstein on theoretical polymer physics and with Prof. Richard C. Boucher on experimen tal biophysics. During his postdoctoral training with Prof. David Weitz at Harvard\, he switched to experiments. Since 2018\, he has been leading Soft Biomatter Laboratory at UVa\, where his group focuses on understanding and controlling the interactions between active soft materials and living syst ems with the mission to solve challenges in health\, sustainability\, and e nvironmental science. He received North Carolina Impact \;Award\, Harva rd Postdoctoral Award for Professional Development\, ACS PRF Doctoral New I nvestigator Award\, NSF CAREER Award\, and recently has been recognized as a \;Soft Matter \;Emerging Investigator.

    BIPH websi te: https://ipst.umd.edu/graduate-programs/biophysics/events

    LAST-MODIFIED:20210830T154717Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210913T203000Z DTEND:20210913T213000Z DTSTAMP:20220808T214455Z UID:7a2rgh88uer827h6kg50leh1sb@google.com CREATED:20210828T021432Z DESCRIPTION:Title: On the Initiation Processes of Solar Flares and Coronal Mass Ejections

    Speaker: Jie Zhang\, Department of \;Physics and Astronomy\, George Mason University

    Abstract: Flares and coronal mas s ejections (CMEs) are both energetic phenomena originated in the Sun’s cor ona. Flares are manifested as a sudden\, in a time scale of minutes\, gener ation of electromagnetic radiations in all wavelengths\, while equally ener getic CMEs are shown as a large-scale eruption of an organized magnetic str ucture into the interplanetary space. It is well recognized that they are t he drivers of space weather that may have adverse effects on advanced techn ological systems in the space and on the ground. In this talk\, I will firs t reflect on the debate in the 1990s on “solar flare myth”\, which was abou t what is the true cause of space weather\, i.e.\, whether flares or CMEs. A comprehensive overview on our improved understanding about the relations between flares and CMEs will be presented\, thanks to the advancement in ob servations made by a series of modern space observatories\, including SOHO\ , SDO and STEREO. Very often\, it is found that the energetic process of a flare (e.g.\, increase of X-ray flux) and a CME (e.g.\, increase of CME vel ocity) is synchronized in time\; thus\, they can be collectively called a s olar eruption. On the other hand\, they can also occur independently\, name ly compact/confined flares and “stealthy” CMEs\, respectively. I will furth er discuss how such diversity of observed phenomena poses challenges to the oretical and numerical models of solar eruptions\, which are largely divide d into two camps depending on whether the eruption is triggered by magnetic reconnection or instability of magnetic flux ropes.

    Notes: Visit https://bit.ly /2PmJoT6 \;for access LAST-MODIFIED:20210828T022058Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Space and Cosmic Ray Physics Online Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210913T200000Z DTEND:20210913T210000Z DTSTAMP:20220808T214455Z UID:2akqvua8lr6113ihqj7gqgh1cr@google.com CREATED:20210826T200733Z DESCRIPTION:

    Title: \;Designing medical devices with computational biophotonics

    Speaker: \;Nicholas Durr\, Johns Hopkins

    Hosted by: \;Giuliano Scar celli

    Abstract: \;

    Computational biophoton ics pairs optical system design with the development of intelligent algorit hms to extract meaningful data from interrogated tissues (often via an unin tuitive computational image). With the recent advances in deep learning\, t here are many exciting opportunities to apply data-driven models to novel o ptical imaging systems to create impactful medical devices. I will present our research in developing and translating computational biophotonics medic al devices for a variety of important healthcare needs\, including: (1) imp roving the management of colorectal cancer with deep learning and the compu tational colonoscope\, (2) enabling a non-invasive blood count with oblique back-illumination capillaroscopy\, and (3) making eye care accessible in l ow-resource settings with a low-cost\, handheld wavefront aberrometer.

    < p>Biography:

    Nicholas Durr is an AssistantProfessor of Biomedical Engineering at Johns Hopkins University and the co-Directorof Un dergraduate Programs at the Center for Bioengineering Innovation andDesign (CBID). He received a B.S. in Electrical Engineering and ComputerScience fr om U.C. Berkeley in 2003\, worked as a Research Engineer at Nellcorfrom 200 3 to 2004\, and received a Ph.D. in Biomedical Engineering from U.T.Austin in 2010. He completed a Postdoctoral Fellowship at Harvard MedicalSchool in 2011 and was an independent investigator at MIT from 2011 to 2014 asan M+V isión Fellow. In 2013 he co-founded PlenOptika\, which he led as CEO untilh e joined Hopkins in 2016. \;

    BIPH website: https://ipst.um d.edu/graduate-programs/biophysics/events


    LAST-MODIFIED:20210826T201257Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Biophysics Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210830T190000Z DTEND:20210830T203000Z DTSTAMP:20220808T214455Z UID:5r2j4oq9aol6nmltd4olvb8jh4@google.com CREATED:20210826T121718Z DESCRIPTION:Speaker: Michael Fedderke\, JHU\n\nTitle: Bridging the microher tz gap with asteroids: opportunities and challenges for gravitational wave detection\n\nAbstract: The science case for a broad program of gravitationa l wave (GW) detection across all frequency bands is exceptionally strong. A t present\, there is a dearth of coverage by existing and proposed searches in the GW frequency band lying between the peak sensitivities of PTAs and LISA\, roughly 0.1-100 microhertz. In this talk\, I will outline a conceptu al mission proposal to access this band. I will demonstrate that a few care fully chosen asteroids which orbit in the inner Solar System can act as exc ellent naturally occurring gravitational test masses despite the environmen tal noise sources. As such\, a GW detector can be constructed by ranging be tween these asteroids using optical or radio links. At low frequencies\, I will discuss how gravity gradient noise arising from the combined motion of the other ~10^6 asteroids in the inner Solar System sharply cuts off the s ensitivity of this proposal. Sensitivity in the middle of this band is most ly limited by various solar perturbations to the asteroid test masses\, whi le the high-frequency sensitivity is limited by noise in the ranging link. The projected strain-sensitivity curve that I will present indicates signif icant potential reach in this frequency band for a mission of this type.\n\ nFor zoom link please email: mknouse@umd.edu LAST-MODIFIED:20210826T121718Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online EPT Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210824T180000Z DTEND:20210824T190000Z DTSTAMP:20220808T214455Z UID:7jpehs2iui7bffqrgso8onqm4p@google.com CREATED:20210816T112810Z DESCRIPTION:
    Speaker: Batoul Banihashemi\, UMD

    Title: Thermodynam ic ensembles with cosmological horizons

    Abstract: The entropy of a d e Sitter horizon was derived long ago by Gibbons and Hawking via a gravitat ional partition function. Since there is no boundary at which to define the temperature or energy of the ensemble\, the statistical foundation of thei r approach has remained obscure. We introduce an artificial "York" boundary with a fixed size and either canonical or microcanonical boundary conditio ns\, so that the path integral defines either the partition function or the density of states. The ensembles include configurations with a black hole horizon inside the boundary\, or a cosmological horizon outside. We identif y the dominant configurations for different spherically symmetric ensembles \, and estimate the path integrals using their actions. At high enough temp erature a metastable black hole phase exists and has lower free energy than empty de Sitter space\, but the lowest free energy corresponds to a cosmol ogical horizon with de Sitter radius\, which is an endpoint of the configur ation space. A dynamical process that could drive the system towards this e ndpoint (and others) will be discussed.

    Seminar Recording LAST-MODIFIED:20210825T122831Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210909T150000Z DTEND:20210909T163000Z DTSTAMP:20220808T214455Z UID:5ni9am1bjo4qjakhlt4obslo3j@google.com CREATED:20210819T140112Z DESCRIPTION:Seminar will be conducted via zoom: https:// umd.zoom.us/j/99485261927?pwd=M3dIUE5zRm1rV2cxdVp2bXV0WWFpZz09

    S peaker: Uwe-Jens Wiese\, University of Bern

    A 30 min social hour at 11am with the seminar at 11:30am

    Title: A New Concept for the Moment um of a Particle in a Space with Impenetrable Boundaries

    Abstract:In a region of space with impenetrable boundaries\, the standard quantum mechanical momentum operator is not self-adjoint and thus does not describe the physical momentum. A new momentum concept\, that is both physically an d mathematically satisfactory\, leads to a doubling of the Hilbert space. B ased upon the new concept\, the uncertainty relation is generalized to a fi nite volume. Also the Ehrenfest theorem\, which is otherwise not satisfied\ , holds for a particle in a box\, when the new momentum concept is applied. In that case\, bouncing Gaussian wave packets split into two separate pack ets before they merge again later\, and the fractional revival manifests it self in the corresponding momentum space wave functions. The new momentum c oncept is applicable\, for example\, to particles in an optical box trap an d to quantum dots. LAST-MODIFIED:20210819T140112Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Online Nuclear Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210805T190000Z DTEND:20210805T200000Z DTSTAMP:20220808T214455Z UID:6g8alde6l8p9n0qqdk57hfhlt5@google.com CREATED:20210729T194143Z DESCRIPTION:Speaker: Rodrigo Andrade E Silva\n\nTitle: Quantization of a ca usal diamond in 2+1 dimensional gravity\n\nAbstract: We develop the reduced phase space quantization of causal\ndiamonds in pure 2+1 dimensional gravi ty with a negative\ncosmological constant. The system is defined as the dom ain\nof dependence of a spacelike topological disk with fixed\nboundary len gth. By solving the constraints in a\nconstant-mean-curvature time gauge an d removing all the\nspatial gauge redundancy\, we find that the phase space is\nthe cotangent bundle of Diff^+(S^1)/PSL(2\, R). To quantize\nthis nonl inear phase space we apply Isham's group-theoretic\nquantization scheme\, a nd find that the quantum theory can be\nrealized by wavefunctions on some c oadjoint orbit of the\nVirasoro group\, with labels in irreducible unitary\ nrepresentations of the corresponding little group. We find\nthat the twist of the diamond boundary loop is quantized in\nterms of the ratio of the Pl anck length to the boundary\nlength. LAST-MODIFIED:20210729T194151Z LOCATION:PSC 3150 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Gravity Theory Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210803T133000Z DTEND:20210803T143000Z DTSTAMP:20220808T214455Z UID:2tg4fc9rsg0nh3vqajvh4ucdu9@google.com CREATED:20210727T112645Z DESCRIPTION:
    < /table>
    Title: Quantum Simulation with Ph onons in Trapped Ions

    Zoom link:
    https://umd.zoom.us/j/99142108696

    Speaker:&nb sp\; Ryutaro Ohira\, Osaka University
     \;< br>Abstract:
    Trapped ions are a promising candidate for implementing ana log quantum simulation. By utilizing laser-atom interactions\, individual i on qubits can be initialized\, interacted\, and detected. Since an ion's in ternal degrees of freedom represent a spin-1/2 system\, many experiments ha ve been performed to simulate the interacting quantum spins. For the last d ecade\, an alternative approach has been used to develop a trapped-ion quan tum simulator for bosonic many-body systems. The ions inherently possess an other degree of freedom\, a quantized motional degree of freedom\, i.e.\, p honons. With the capability of deterministic operations together with their bosonic nature\, phonons in trapped ions are excellent resources to realiz e quantum simulations of bosonic quantum many-body systems. In this talk\, I will present progress towards the realization of quantum simulations with phonons in trapped ions\, mainly focusing on the manipulation of multiple local phonons in trapped ions. In the second half of this talk\, I will tal k about a quantum simulation of the Jaynes-Cummings-Hubbard model\, based o n the utilization of multiple local phonons. In this simulation\, we succes sfully observe exotic quantum behavior of quasi-particles.

    Affiliati ons:
    Center for Quantum Information and Quantum Biology\, and Graduate S chool of Engineering Science\, Osaka University LAST-MODIFIED:20210727T112725Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210727T200000Z DTEND:20210727T210000Z DTSTAMP:20220808T214455Z UID:3o9d9ibkj7rdutnvnjm7qj3ueg@google.com CREATED:20210721T143336Z DESCRIPTION:Title: Lower Bounds on Stabilizer Rank\nSpeaker: Dr. Ben Lee V olk (The University of Texas at Austin)\nTime: Tuesday\, July 27\, 2021 - 4:00pm\nLocation: Virtual Via Zoom: https://uwaterloo.zoom.us/j/9928664912 6?pwd=Zml0UjBQMzBCVWZlUGlqTDJkMzlIQT09\n\nThe stabilizer rank of a quantum state ψ is the minimal integer r such that ψ can be written as a linear com bination of r stabilizer states. The running time of several classical simu lation methods for quantum circuits is determined by the stabilizer rank of the n-th tensor power of single-qubit magic states. In this talk we'll pre sent a recent improved lower bound of Ω(n) on the stabilizer rank of such s tates\, and an Ω(sqrt{n}/log n) lower bound on the rank of any state which approximates them to a high enough accuracy. Our techniques rely on the rep resentation of stabilizer states as quadratic functions over affine subspac es of the boolean cube\, along with some tools from computational complexit y theory. \n\n Reference: Peleg\, Shir\, Amir Shpilka\, and Ben Lee Volk. " Lower Bounds on Stabilizer Rank." arXiv preprint arXiv:2106.03214 (2021). \ n\nThis talk is part of the IQC-QuICS Math and Computer Science Seminar. LAST-MODIFIED:20210721T143336Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Dr. Ben Lee Volk TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210720T200000Z DTEND:20210720T210000Z DTSTAMP:20220808T214455Z UID:5slffd88bct4qd927p5n2fl4el@google.com CREATED:20210624T124818Z DESCRIPTION:Title: Quantum coding with low-depth random circuits
    Speake r: Michael Gullans (QuICS)
    Time: Tuesday\, July 20\, 2021 - 4:00 pm
    Location: Virtual Via Zoom: https://umd.zoom.us/j/95843628305?pwd=bmZ acFBQaDRPSHlqKzY1YzNYRDMrZz09

    We study quantum error correcting codes generated by local random circuits and consider the circuit depth req uired to achieve high-performance against local error models. Notably\, we find that random circuits in D spatial dimensions generate high-performing codes at depth at most O(log N) independent of D. Our approach to quantum c ode design is rooted in arguments from statistical physics and establishes several deep connections between random quantum coding and critical phenome na in phase transitions. In addition\, we introduce a method of targeted me asurements to achieve high-performance coding at sub-logarithmic depth abov e one dimension. These latter results provide interesting connections to th e topic of measurement-induced entanglement phase transitions.

    Refer ence: Gullans\, Michael J.\, et al. "Quantum coding with low-depth random c ircuits." arXiv preprint arXiv:2010.09775 (2020).

    This talk is part of the IQC-QuICS Math and Computer Science Seminar. LAST-MODIFIED:20210714T203215Z LOCATION: SEQUENCE:1 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar: Michael Gullans TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210716T133000Z DTEND:20210716T153000Z DTSTAMP:20220808T214455Z UID:27baa7umhqv2tn7ugcvgdememi@google.com CREATED:20210708T193226Z DESCRIPTION:Title: Design and optimization in near-term quantum computation
    Speaker: Aniruddha Bapat (QuICS)
    Time: Friday\, July 16\, 2021 - 9:3 0am
    Location: Virtual Via Zoom: https://umd.zoom.us/j/9180490339

    Quantum computers have come a long way since conception\, and there is still a long way to go before th e dream of universal\, fault-tolerant computation is realized. In the near term\, quantum computers will occupy a middle ground that is popularly know n as the ``Noisy\, Intermediate-Scale Quantum'' (or NISQ) regime. The NISQ era represents a transition in the nature of quantum devices from experimen tal to computational. There is significant interest in engineering NISQ dev ices and NISQ algorithms in a manner that will guide the development of qua ntum computation in this regime and into the era of fault-tolerant quantum computing.

    In this thesis\, we study two aspects of near-term quantu m computation. The first of these is the design of device architectures\, c overed in Chapters 2\, 3\, and 4. We examine different qubit connectivities on the basis of their graph properties\, and present numerical and analyti cal results on the speed at which large entangled states can be created on nearest-neighbor grids and graphs with modular structure. Next\, we discuss the problem of permuting qubits among the nodes of the connectivity graph using only local operations\, also known as routing. Using a fast quantum p rimitive to reverse the qubits in a chain\, we construct a hybrid\, quantum /classical routing algorithm on the chain. We show via rigorous bounds that this approach is faster than any SWAP-based algorithm for the same problem .

    The second part\, which spans the final three chapters\, discusses variational algorithms\, which are a class of algorithms particularly suit ed to near-term quantum computation. Two prototypical variational algorithm s\, quantum adiabatic optimization (QAO) and quantum approximate optimizati on algorithm (QAOA)\, are studied for the difference in their control strat egies. We show that on certain crafted problem instances\, bang-bang contro l (QAOA) can be as much as exponentially faster than quasistatic control (Q AO). Next\, we demonstrate the performance of variational state preparation on an analog quantum simulator based on trapped ions. We show that using c lassical heuristics that exploit structure in the variational parameter lan dscape\, one can find circuit parameters efficiently in system size as well as circuit depth. In the experiment\, we approximate the ground state of a critical Ising model with long-ranged interactions on up to 40 spins.

    Finally\, we study the performance of Local Tensor\, a classical heuri stic algorithm inspired by QAOA on benchmarking instances of the MaxCut pro blem\, and suggest physically motivated choices for the algorithm hyperpara meters that are found to perform well empirically. We also show that our im plementation of Local Tensor mimics imaginary-time quantum evolution under the problem Hamiltonian. LAST-MODIFIED:20210708T193432Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense: Aniruddha Bapat TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210810T140000Z DTEND:20210810T150000Z DTSTAMP:20220808T214455Z UID:7s3gb25nvk3uikt3h3qqc3khlk@google.com CREATED:20210708T130046Z DESCRIPTION:Title: Linear growth of quantum circuit complexity\nSpeaker: J onas Haferkamp (Freie Universität Berlin)\nTime: Tuesday\, August 10\, 2021 - 10:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/91765577450?p wd=T1h1OXBmSVRvVVAreGZsK3pHRHpqUT09\n\nQuantifying quantum states’ complexi ty is a key problem in various subfields of science\, from quantum computin g to black-hole physics. We prove a prominent conjecture by Brown and Sussk ind about how random quantum circuits’ complexity increases. Consider const ructing a unitary from Haar-random two-qubit quantum gates. Implementing th e unitary exactly requires a circuit of some minimal number of gates - the unitary’s exact circuit complexity. We prove that this complexity grows lin early in the number of random gates\, with unit probability\, until saturat ing after exponentially many random gates. Our proof is surprisingly short\ , given the established difficulty of lower-bounding the exact circuit comp lexity. Our strategy combines differential topology and elementary algebrai c geometry with an inductive construction of Clifford circuits. Reference: Haferkamp\, Jonas\, et al. "Linear growth of quantum circuit complexity." arXiv preprint arXiv:2106.05305 (2021). \n\nThis talk is part of the IQC-Qu ICS Math and Computer Science Seminar. LAST-MODIFIED:20210708T130046Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210830T110000 DTEND;TZID=America/New_York:20210830T120000 RRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20211215T045959Z;BYDAY=MO EXDATE;TZID=America/New_York:20211011T110000 EXDATE;TZID=America/New_York:20210906T110000 DTSTAMP:20220808T214455Z UID:342nlialmc6f1f5mgp0vck8o07@google.com CREATED:20210708T004621Z DESCRIPTION:Speaker:\n\nTitle: \nAbstract: \n\nHost: LAST-MODIFIED:20210708T004927Z LOCATION:ATL 2400 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210720T150000Z DTEND:20210720T160000Z DTSTAMP:20220808T214455Z UID:77bmpb6uod69oeqppm7d51562n@google.com CREATED:20210701T141147Z DESCRIPTION:Speaker: \;Yi-Hsien Du \;(University of C hicago)
    Title: \;Volume-preserving diffeomorphism as higher-r ank gauge symmetry
    Abstract: \;Higher-rank gauge theories hav e been drawing attention in condensed matter physics in recent years. The p hysical motivation of such theories is thought to be associated with a new class of topological matter so-called "fractons\," quasiparticles with rest ricted mobility. We demonstrate a nonlinear version of the higher rank gaug e symmetry in 2+1D and 3+1D with volume-preserving diffeomorphism as the sy mmetry group. We show that various condensed matter systems\, including fra ctional quantum Hall effect and ferromagnetism\, possess this symmetry\, wh ich exhibits fractonic behavior of the excitations in these systems.

    Host TBA


    Email rcawthor@umd.edu for Zoom detai ls LAST-MODIFIED:20210701T141147Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Informal Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210713T133000Z DTEND:20210713T153000Z DTSTAMP:20220808T214455Z UID:2t5i3bqg6lhl3sag2238eo2a7u@google.com CREATED:20210629T160311Z DESCRIPTION:Title: Locality\, Symmetry\, and Digital Simulation of Quantum Systems\nSpeaker: Minh Tran (QuICS)\nTime: Tuesday\, July 13\, 2021 - 9:30 am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j/3528081788\n\nBesides potentially delivering a huge leap in computational power\, quantum comput ers also offer an essential platform for simulating properties of quantum s ystems. Consequently\, various algorithms have been developed for approxim ating the dynamics of a target system on quantum computers. But generic qua ntum simulation algorithms---developed to simulate all Hamiltonians---are u nlikely to result in optimal simulations of most physically relevant system s\; optimal quantum algorithms need to exploit unique properties of target systems.\n\nThe aim of this dissertation is to study two prominent properti es of physical systems\, namely locality and symmetry\, and subsequently le verage these properties to design efficient quantum simulation algorithms.\ n\nIn the first part of the dissertation\, we explore the locality of quant um systems and the fundamental limits on the propagation of information in power-law interacting systems. We prove upper limits on the speed at which information can propagate in power-law systems. We also demonstrate how suc h speed limits can be achieved by protocols for transferring quantum inform ation and generating quantum entanglement. We then use these speed limits t o constrain the propagation of error and improve the performance of digital quantum simulation. Additionally\, we consider the implications of the spe ed limits on entanglement generation\, the dynamics of correlation\, the he ating time\, and the scrambling time in power-law interacting systems.\n\nI n the second part of the dissertation\, we propose a scheme to leverage the symmetry of target systems to suppress error in digital quantum simulation . We first study a phenomenon called destructive error interference\, where the errors from different steps of a simulation cancel out each other. We then show that one can induce the destructive error interference by interwe aving the simulation with unitary transformations generated by the symmetry of the target system\, effectively providing a faster quantum simulation b y symmetry protection. We also derive rigorous bounds on the error of a sym metry-protected simulation algorithm and identify conditions for optimal sy mmetry protection. LAST-MODIFIED:20210629T160311Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense: Minh Tran TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210709T140000Z DTEND:20210709T160000Z DTSTAMP:20220808T214455Z UID:45968hbldlbun2lh1qm1238pp8@google.com CREATED:20210625T164225Z DESCRIPTION:Title: The complexity of simulating quantum physics: dynamics and equilibrium
    Speaker: Abhinav Deshpande (QuICS)
    Time: Friday\, Jul y 9\, 2021 - 10:00am
    Location: Virtual Via Zoom: https://umd.zoom.us/j/91579244863 Meeting ID: 915 7924 4863

    Quantum computing is the offspring of quantum mechanics an d computer science\, two great scientific fields founded in the 20th centur y. Quantum computing is a relatively young field and is recognized as havin g the potential to revolutionize science and technology in the coming centu ry. The primary question in this field is essentially to ask which problems are feasible with potential quantum computers and which are not. In this d issertation\, we study this question with a physical bent of mind. We apply tools from computer science and mathematical physics to study the complexi ty of simulating quantum systems. In general\, our goal is to identify para meter regimes under which simulating quantum systems is easy (efficiently s olvable) or hard (not efficiently solvable). This study leads to an underst anding of the features that make certain problems easy or hard to solve. We also get physical insight into the behavior of the system being simulated.

    In the first part of this dissertation\, we study the classical com plexity of simulating quantum dynamics. In general\, the systems we study t ransition from being easy to simulate at short times to being harder to sim ulate at later times. We argue that the transition timescale is a useful me asure for various Hamiltonians and is indicative of the physics behind the change in complexity. We illustrate this idea for a specific bosonic system \, obtaining a complexity phase diagram that delineates the system into eas y or hard for simulation. We also prove that the phase diagram is robust\, supporting our statement that the phase diagram is indicative of the underl ying physics.

    In the next part\, we study open quantum systems from the point of view of their potential to encode hard computational problems. We study a class of fermionic Hamiltonians subject to Markovian noise desc ribed by Lindblad jump operators and illustrate how\, sometimes\, certain L indblad operators can induce computational complexity into the problem. Spe cifically\, we show that these operators can implement entangling gates\, w hich can be used for universal quantum computation. We also study a system of bosons with Gaussian initial states subject to photon loss and detected using photon-number-resolving measurements. We show that such systems can r emain hard to simulate exactly and retain a relic of the ``quantumness'' pr esent in the lossless system.

    Finally\, in the last part of this dis sertation\, we study the complexity of simulating a class of equilibrium st ates\, namely ground states. We give complexity-theoretic evidence to ident ify two structural properties that can make ground states easier to simulat e. These are the existence of a spectral gap and the existence of a classic al description of the ground state. Our findings complement and guide effor ts in the search for efficient algorithms. LAST-MODIFIED:20210625T164330Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense: Abhinav Deshpande TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210614T140000Z DTEND:20210614T220000Z DTSTAMP:20220808T214455Z UID:6gssa3ehrq4rvdv5uln3uldcvb@google.com CREATED:20210519T162131Z DESCRIPTION:"Twisted: Physics of 2D Twisted Moire Systems" - Virtual Con ference

    Thrid conference in the Janet Das Sarma Conference Serie s
    Email Rcawthor@umd.edu for Zo om details

    10 AM: Pablo Jarillo-Herrero\, “Moiré Magic 3.0 ” \; \;

    11 AM: \;Ashvin Vishwanath\, “Moire' magic near charge neutrality: \; From sign-free numerics to fractional vortices” \;

    12 PM: Andrea Young\, “Easy as ABC”&nb sp\;

    1 PM: Michael Zaletel\, “DMRG evidence for skyrmion -mediated superconductivity” \;

    2 PM: Oskar Vafek\, “Correlations and topology in the magic angle twisted bilayer graphene”&nbs p\;

    3 PM: Cory Dean\, “TBA” \;

    4 PM: Kin Fai Mak\, “Semiconductor moiré 2.0” \;

    5 PM: Sankar D as Sarma\, “Superconductivity\, magnetism\, strange metals\, and correlated insulators in twisted 2D moire systems” LAST-MODIFIED:20210611T184225Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Conference: "Twisted: Physics of 2D Twisted Moire Systems" TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210622T190000Z DTEND:20210622T210000Z DTSTAMP:20220808T214455Z UID:4n972diuan0jiid77ja61a4ooa@google.com CREATED:20210610T122157Z DESCRIPTION:Title: Analog quantum simulation and quantum many-body dynamic s in atomic\, molecular and optical systems\nSpeaker: Fangli Liu (QuICS)\nT ime: Tuesday\, June 22\, 2021 - 3:00pm\nLocation: Virtual Via Zoom: https:/ /umd.zoom.us/j/98584157912?pwd=NTRYV0ZTcVVuT0k5a29yemNYL0VCdz09\n\nIn recen t decades\, the rapid development of quantum technologies has led to a new era of programmable platforms\, enabling the realizations of quantum simula tion and quantum computation. This dissertation is motivated by recent expe rimental progress on controlling individual quantum degrees of freedom in s ystems such as trapped ions and Rydberg atom arrays. By tailoring the inte ractions in these quantum systems\, we study analog quantum simulations of various physical phenomena\, including non-equilibrium quantum dynamics and nontrivial topological physics. In the first part of the dissertation\, w e study slow quantum many-body dynamics in trapped-ion systems and Rydberg atom arrays. We first show that either the long-range interactions or an ad ditional symmetry-breaking field can give rise to a confining potential. Su ch a potential can couple domain wall quasiparticles into mesonic or baryon ic bound states. These confined quasiparticles strongly suppress the quant um information dynamics and lead to slow thermalization. In the limit of s trict domain-wall confinement\, the full Hilbert space is fragmented into e xponentially many disconnected subspaces. Further\, we demonstrate that the rmalization can be halted by quantum engineering a uniformly increasing fie ld in the trapped-ion quantum simulator. The second part of the dissertati on focuses on topologically relevant phenomena in quantum simulators. We fi rst study the effect of experimentally relevant disorder in 2D Rydberg atom arrays. We find that there are three distinct localization regimes due to the presence of nontrivial topological bands. We further study the non-equi librium dynamics of Abelian anyons in a one-dimensional system. We show tha t the interplay of anyonic statistics and interactions can give rise to spa tially asymmetric quantum dynamics. Finally\, we use Nielsen's geometric ap proach to quantify the circuit complexity in topological models. We find th at circuit complexity of ground states and circuit complexity of non-equili brium steady states both exhibit nonanalytical behavior at topological tran sition points. LAST-MODIFIED:20210610T122258Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Dissertation Defense - Fangli Liu TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210608T200000Z DTEND:20210608T210000Z DTSTAMP:20220808T214455Z UID:6t9tu7hm8npqbt21mjmjr6059n@google.com CREATED:20210603T160442Z DESCRIPTION:Title: Fault-tolerant error correction using flags and error w eight parities
    Speaker: Theerapat Tansuwannont (University of Waterloo)< br>Time: Tuesday\, June 8\, 2021 - 4:00pm
    Location: Virtual Via Zoom: https://zoom.us/j/95104727535?pwd=WS8rRTJOTFkyUzUzZG5NMEkxRlpCZz09
    < br>Fault-tolerant error correction (FTEC)\, a procedure which suppresses er ror propagation in a quantum circuit\, is one of the most important compone nts for building large-scale quantum computers. One major technique often u sed in recent works is the flag technique\, which uses a few ancillas to de tect faults that can lead to errors of high weight and is applicable to var ious fault-tolerant schemes. In this talk\, I will further improve the flag technique by introducing the use of error weight parities in error correct ion. The new technique is based on the fact that for some families of codes \, errors of different weights are logically equivalent if they correspond to the same syndrome and the same error weight parity\, and need not be dis tinguished from one another. I will also give a brief summary of my works o n FTEC protocols for several families of codes\, including cyclic CSS codes \, concatenated Steane code\, and capped color codes\, which requires only a few ancillas.

    Join Zoom Meeting
    https://zoom.us/j/95104727535 ?pwd=WS8rRTJOTFkyUzUzZG5NMEkxRlpCZz09
    Meeting ID: 951 0472 7535
    P asscode: mJ8fVht

    This talk is part of the \;IQC-QuICS Math and Computer Science Seminar. LAST-MODIFIED:20210603T160537Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210615T140000Z DTEND:20210615T150000Z DTSTAMP:20220808T214455Z UID:1qsbjq9e9ncmkvl5num8j6a1vs@google.com CREATED:20210601T151817Z DESCRIPTION:Title: Fermion Sampling: a robust quantum computational advant age scheme using fermionic linear optics and magic input states
    Speaker: Michał Oszmaniec (Center for Theoretical Physics\, Polish Academy of Scie nces)
    Time: Tuesday\, June 15\, 2021 - 10:00am
    Location: Virtual Vi a Zoom: https://zoom.us/j/95104727535?pwd=WS8rRTJOTFkyUzUzZG5NMEkxRlpCZz0 9

    Fermionic Linear Optics (FLO) is a restricted model of quantum computation which in its original form is known to be efficiently classica lly simulable. We show that\, when initialized with suitable input states\, FLO circuits can be used to demonstrate quantum computational advantage wi th strong hardness guarantees. Based on this\, we propose a quantum advanta ge scheme which is a fermionic analogue of Boson Sampling: Fermion Sampling with magic input states.

    We consider in parallel two classes of cir cuits: particle-number conserving (passive) FLO and active FLO that preserv es only fermionic parity and is closely related to Matchgate circuits intro duced by Valiant. Mathematically\, these classes of circuits can be underst ood as fermionic representations of the Lie groups U(d) and SO(2d). This ob servation allows us to prove our main technical results. We first show anti concentration for probabilities in random FLO circuits of both kind. Moreov er\, we prove robust average-case hardness of computation of probabilities. To achieve this\, we adapt the worst-to-average-case reduction based on Ca yley transform\, introduced recently by Movassagh\, to representations of l ow-dimensional Lie groups. Taken together\, these findings provide hardness guarantees comparable to the paradigm of Random Circuit Sampling.

    I mportantly\, our scheme has also a potential for experimental realization. Both passive and active FLO circuits are relevant for quantum chemistry and many-body physics and have been already implemented in proof-of-principle experiments with superconducting qubit architectures. Preparation of the de sired quantum input states can be obtained by a simple quantum circuit acti ng independently on disjoint blocks of four qubits and using 3 entangling g ates per block. We also argue that due to the structured nature of FLO circ uits\, they can be efficiently certified.

    Reference: Oszmaniec\, Mic hał\, et al. "Fermion Sampling: a robust quantum computational advantage sc heme using fermionic linear optics and magic input states." arXiv preprint arXiv:2012.15825 (2020).

    This talk is part of the \;IQC-QuICS Math and Computer Science Semin ar. LAST-MODIFIED:20210603T154236Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210614T150000Z DTEND:20210614T160000Z DTSTAMP:20220808T214455Z UID:5q8rg8u1o9j4ttai324idajvao@google.com CREATED:20210526T153547Z DESCRIPTION:QuICS Special Seminar\nTitle: Crystallography of Hyperbolic La ttices\nSpeaker: Igor Boettcher (University of Alberta)\nTime: Monday\, J une 14\, 2021 - 11:00am\nLocation: Virtual Via Zoom: https://umd.zoom.us/j /97500163110?pwd=eDBYL3VkVzByL2JEOVZvcTA3d2ZhZz09\n\nHyperbolic lattices ar e tessellations of the hyperbolic plane using\, for instance\, heptagons or octagons. They are relevant for quantum error correcting codes and experim ental simulations of curved space quantum physics in circuit quantum electr odynamics. Underneath their perplexing beauty lies a hidden and\, perhaps\, unexpected periodicity that allows us to identify the unit cell and Bravai s lattice for a given hyperbolic lattice. This paves the way for applying p owerful concepts from solid state physics and\, potentially\, finding a gen eralization of Bloch's theorem to hyperbolic lattices. In my talk\, I will explain how to build a hyperbolic crystallography and apply it to physicall y relevant problems.\n\nJoin Zoom Meeting\nhttps://umd.zoom.us/j/9750016311 0?pwd=eDBYL3VkVzByL2JEOVZvcTA3d2ZhZz09\nMeeting ID: 975 0016 3110\nPasscode : 496822\nOne tap mobile\n+13017158592\,\,97500163110# US (Washington DC)\n +13126266799\,\,97500163110# US (Chicago)\nDial by your location\n + 1 301 715 8592 US (Washington DC)\n +1 312 626 6799 US (Chicago)\n +1 929 436 2866 US (New York)\n +1 253 215 8782 US (Tacoma)\n +1 346 248 7799 US (Houston)\n +1 669 900 6833 US (San Jose)\ nMeeting ID: 975 0016 3110\nFind your local number: https://umd.zoom.us/u/a eJBNddWnJ\nJoin by SIP\n97500163110@zoomcrc.com\nJoin by H.323\n162.255.37. 11 (US West)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.11 4.115.7 (India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244. 140.110 (Germany)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Austr alia Melbourne)\n149.137.40.110 (Singapore)\n64.211.144.160 (Brazil)\n69.17 4.57.160 (Canada Toronto)\n65.39.152.160 (Canada Vancouver)\n207.226.132.11 0 (Japan Tokyo)\n149.137.24.110 (Japan Osaka)\nMeeting ID: 975 0016 3110\nP asscode: 496822 LAST-MODIFIED:20210601T151749Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210601T140000Z DTEND:20210601T160000Z DTSTAMP:20220808T214455Z UID:3semjuao55bjms69c4c7h0386c@google.com CREATED:20210514T153105Z DESCRIPTION:Title: Applications and verification of quantum computers \ ;
    Speaker: Shih-Han Hung (QuICS)
    Time: Tuesday\, June 1\, 2021 - 10:0 0am
    Location: Virtual Via Zoom: https://umd.zoom.us/j/95958136789? pwd=dy83YzZOeVova0NvL3pHeWVDNkVxQT09

    Quantum computing devices c an solve problems that are infeasible for classical computers. While rigoro usly proving speedups over existing classical algorithms demonstrates the u sefulness of quantum computers\, analyzing the limits on efficient processe s for computational tasks allows us to better understand the power of quant um computation. Indeed\, hard problems for quantum computers also enable u seful cryptographic applications. In this dissertation\, we aim to underst and the limits on efficient quantum computation and base applications on ha rd problems for quantum computers. We consider models in which a classical machine can leverage the power of a quantum device\, which may be affected by noise or behave adversarially. We present protocols and tools for detect ing errors in a quantum machine and estimate how serious the deviation is. We construct a non-interactive protocol that enables a purely classical pa rty to delegate any quantum computation to an untrusted quantum prover. In the setting of error-prone quantum hardware\, we employ formal methods to c onstruct a logic system for reasoning about the robustness of a quantum alg orithm design. We also study the limits of ideal quantum computers for com putational tasks and give asymptotically optimal algorithms. In particular\ , we give quantum algorithms which provide speedups for the polynomial inte rpolation problem and show their optimality. Finally\, we study the perform ance of quantum algorithms that learn properties of a matrix using queries that return its action on an input vector\, and show that for various linea r algebra problems\, there is no quantum speedup\, while for some problems\ , exponential speedups can be achieved. LAST-MODIFIED:20210519T151216Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:QuICS - Dissertation Defense TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210514T190000Z DTEND:20210514T203000Z DTSTAMP:20220808T214455Z UID:27gci5p8cqleu8vrhsndueuifa@google.com CREATED:20210511T134234Z DESCRIPTION:Title : Extreme Plasma Astrophysics of Black Holes and Neutron Stars

    Speaker Name: Sasha Philippov

    Speaker Institution : Fla tiron Intstitute

    Abstract : Neutron stars and black holes are powerf ul sources of broad-band non-thermal electromagnetic emission\, including c oherent radio and high-energy radiation. The collective behavior of plasmas that produce these emission signatures is still poorly understood. In orde r to allow modeling emission signatures from first principles\, I construct radiative kinetic plasma simulations of neutron star and black hole enviro nments. In this talk I will describe applications of these methods to the u nderstanding of multi-wavelength pulsar emission mechanism\, including the long-standing problem of the generation of coherent radio waves. I will als o highlight recent work on pair plasma discharges and flares near supermass ive black holes.

    Notes: For Zoom meeting information please contact John Cullinan (jcullina@umd.edu)
    < br>Host Name: John Cullinan
    Host E-Mail: \;jcullina@umd.edu LAST-MODIFIED:20210511T134234Z LOCATION:For Zoom meeting information please contact John Cullinan (jcullin a@umd.edu) SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Joint Space-Science Institute TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210505T173000Z DTEND:20210505T183000Z DTSTAMP:20220808T214455Z UID:3mca03bb2jt2r9un9nimi8nncb@google.com CREATED:20210115T153248Z DESCRIPTION:**Special Joint UMD/ JHU Seminar**

    Speaker: Manue l Franco Sevilla\, UMD \;

    Seminar will be conducted via zoom.

    Title: "RK\, RD(*)\, and their cousins: update on the continued challe nges to lepton flavor universality"

    Abstract: A cornerstone of the S tandard Model (SM) is the universality of the electroweak couplings to the three lepton families. This results in an accidental lepton flavor symmetry that is broken in the SM only due to the different masses of the charged l eptons. However\, since 2012\, a series of measurements of decays involving tree-level b → cτν and loop-level b → sℓℓ transitions (the so-called "B an omalies") have repeatedly hinted at the possibility that lepton universalit y may be\, in fact\, violated. This pattern was reinforced in March 2021 wh en LHCb reported a measurement of RK that for the first time deviated from the SM by more than 3σ in a single LFU observable\, one which is affected b y negligible theoretical uncertainties. In this talk I will go over the the current status of LFU measurements with particular emphasis on the most re cent ones\, and will briefly review the prospects for the upcoming LHCb and Belle II datasets to resolve the anomalies one way or another.

    Link to slides: https://cernbox.cern.ch/index.php/s/9rmucfm3R5V0lfP LAST-MODIFIED:20210507T112405Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Special Joint UMD/ JHU Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210511T150000Z DTEND:20210511T160000Z DTSTAMP:20220808T214455Z UID:74ups3aeuj8u8q9i1oohno2bs7@google.com CREATED:20210505T145358Z DESCRIPTION:Speaker: Yizhi You (Princeton)

    Title:  \;"Fracton critical point and Topological phase transition beyond renormali zation" \;


    Abstract: \;The theory of quant um phase transitions separating different phases with distinct symmetry pat terns at zero temperature is one of the foundations of modern quantum many- body physics. In this talk\, I will demonstrate that the existence of a 2D topological phase transition between a higher-order topological insulator ( HOTI) and a trivial Mott insulator with the same symmetry eludes this parad igm. A significant new element of our phase transition theory is that the i nfrared (IR) effective theory is controlled by short wave-length fluctuatio ns so the critical phenomenon is beyond the renormalization perspective.&nb sp\;

    Host Yang-Zhi Chou

    For Zoom details ema il Rcawthor@umd.edu LAST-MODIFIED:20210505T145557Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Informal Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210517T140000Z DTEND:20210517T220000Z DTSTAMP:20220808T214455Z UID:415lplhaitroas8vp6m64pkm1h@google.com CREATED:20210419T190432Z DESCRIPTION:Part of the Janet Das Sarma Conference Series


    Title: "Quantum"
    Schedule: \;
    10:00 AM:&nbs p\;Immanuel Bloch\, "Realising and probing quantum matter using larg e scale quantum simulations"
    11:00 AM: \;Ignacio Cirac\, "Sim ulations with analog and digital quantum computers"
    12:00 PM: \;L ieven Vandersypen\, "Analog quantum simulating of Fermi-Hubbard physics using quantum dot arrays"
    1:00 PM: \;Andrew Childs\, "Effici ent quantum algorithm for dissipative nonlinear differential equations"
    2:00 PM: \;Markus Greiner\, "Tentative: Simulating strongly corr elated quantum materials using cold fermions in the laboratory"
    3:00 PM:  \;Maissam Barkeshli\, "Measurement-induced topological entangle ment transitions in random quantum circuits"
    4:00 PM: \;Edwin Bar nes\, "Quantum error mitigation at the level of hardware control: from spin echo to geometric space curves"
    5:00 PM: \;Garnet Chan\, "Quantum advantage and quantum chemistry"

    Zoom details email Rca wthor@umd.edu



    LAST-MODIFIED:20210505T145122Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Conference TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210504T171500Z DTEND:20210504T181500Z DTSTAMP:20220808T214455Z UID:6tn2orhkpb6smessk9ofvkkgto@google.com CREATED:20210202T180532Z DESCRIPTION:Speaker: Dr. Joan-Emma Shea\, UC Santa Barbara

    Title:  \;Fibrillization and Liquid-Liquid Phase Separation of the Tau Pep tide

    Abstract: Intrinsically disordered peptides(IDP) are a special class of proteins that do not fold to a uniquethree-dimensional shape. Thes e proteins play important roles in the cell\, fromsignaling to serving as s tructural scaffolds. Under pathological conditions\,they can self-assemble into structures that are toxic to the cell\, and a numberof neurodegenerati ve diseases are associated with this self-assembly process.My talk will foc us on the Tau protein\, an IDP that binds to microtubules andcan form fibri llar aggregates\, a process that has been linked with Alzheimer’sdisease. I n addition to forming fibrils\, the Tau protein can also phaseseparate into a protein rich and a protein depleted phase\, a process known asliquid-liq uid phase separation (LLPS). This process may play a protective rolein the cell against pathological fibrillization. I will present moleculardynamics and field theoretic simulations that map out the phase diagram for TauLLPS\ , and use this phase diagram to predict the conditions under which Tau canb e driven towards LLPS under live cell coculturing conditions. LAST-MODIFIED:20210503T211702Z LOCATION:https://go.umd.edu/statphys_spring2021 SEQUENCE:0 STATUS:CONFIRMED SUMMARY:Informal Statistical Physics Seminar - CANCELLED TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210506T210000Z DTEND:20210506T220000Z DTSTAMP:20220808T214455Z UID:39el3hsa60h3tltordh813f1f9@google.com CREATED:20210503T135701Z DESCRIPTION:

    Title: Quantum accelerators: a new trajectory for quant um computers
    Speaker: Dr Marcus Doherty
    Affiliation: Quantum B rilliance



    Time: Thursday\, May 6 a t 5pm



    Zoom Link: https://umd.zoom.us/j/95285740962


    Bio and abstract: Marcus is recogniz ed as a principal contributor to the emergence of diamond-based quantum tec hnologies\, including quantum microscopy\, quantum computing and quantum co mmunications. These technologies represent new paradigms of microscopy\, co mputing and communications that have the potential to revolutionize many di sciplines of science and technology. During this seminar Marcus will share more about how the industry can expand the vision for quantum computing. LAST-MODIFIED:20210503T135721Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI-QuICS-CMTC Special Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20210510T110000 DTEND;TZID=America/New_York:20210510T120000 DTSTAMP:20220808T214455Z UID:7svebhjdkb4jhfuglupc33es0g_R20210208T160000@google.com RECURRENCE-ID;TZID=America/New_York:20210510T110000 CREATED:20210114T020453Z DESCRIPTION:

    Title: Internally engineered Majorana modes in twisted bilayer graphene

    Speaker: Jason Alicea\, California Institute \;of Technology

    Abstract: Twisted bilayer graphene (TBG) realizes an exquisitely tunable\, strongly i nteracting system featuring superconductivity and various correlated insula ting states. \; In this talk I will introduce gate-defined wires in TBG as an enticing platform for Majorana-based fault-tolerant qubits. \; O ur proposal notably relies on “internally” generated superconductivity in T BG – as opposed to “external” superconducting proximity effects commonly em ployed in Majorana devices – and may operate even at zero magnetic field. & nbsp\;I will also describe how electrical measurements of gate-defined wire s can reveal the nature of correlated insulators and shed light on the Coop er-pairing mechanism in TBG. \;


    We are hosting the Spring 2021 J QI Seminars virtually as Zoom meetings. JQI members and affiliates will rec eive a Zoom link in an email announcing each seminar. For those without acc ess to Zoom\, we will also be live streaming each seminar on YouTube. Once a seminar starts\, you will find a link to the live stream on our YouTube p age at \;https://www.you tube.com/user/JQInews. LAST-MODIFIED:20210501T011756Z LOCATION:Zoom Meeting SEQUENCE:0 STATUS:CONFIRMED SUMMARY:JQI Seminar (Virtually) TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210504T170000Z DTEND:20210504T180000Z DTSTAMP:20220808T214455Z UID:1l6ciabr5cr07lhkfj5l16e2kd@google.com CREATED:20210430T112259Z DESCRIPTION:Speaker: Xie Chen (CalTech)

    Title: Fracton and Chern-Sim ons Theory

    Abstract: Fracton order describes the peculiar phenomena that point excitations in certain strongly interacting systems either canno t move at all or are only allowed to move in a lower dimensional sub-manifo ld. It has recently been discovered in various lattice models\, tensor gaug e theories\, etc. In this talk\, we discuss how another powerful field theo ry framework -- the 2+1D Chern-Simons (CS) gauge theory -- can be used to p rovide new insights and explore new possibilities in 3+1D fracton order. 2+ 1D U(1) gauge theories with a CS term provide a simple and complete charact erization of 2+1D Abelian topological orders. To study 3+1D fracton order\, we extend the theory by taking the number of component gauge fields to be infinity. In the simplest case of infinite-component CS gauge theory\, diff erent components do not couple to each other and the theory describes a dec oupled stack of 2+1D fractional Quantum Hall systems with quasi-particles m oving only in 2D planes -- hence a fractonic system. More interestingly\, w e find that when the component gauge fields do couple through the CS term\, more varieties of fractonic orders are possible. For example\, they may de scribe foliated fractonic systems which extends the framework found in exac tly solvable models. At the same time\, we find examples which lie beyond t he foliation framework\, characterized by 2D excitations of infinite order and braiding statistics that are not strictly local.

    For Zoom det ails email: rcawthor@umd.edu LAST-MODIFIED:20210430T112259Z LOCATION: SEQUENCE:0 STATUS:CONFIRMED SUMMARY:CMTC Seminar TRANSP:OPAQUE END:VEVENT BEGIN:VEVENT DTSTART:20210507T170000Z DTEND:20210507T180000Z DTSTAMP:20220808T214455Z UID:03v6fbs7gmrulqrs5elep51vmj@google.com CREATED:20210202T141948Z DESCRIPTION:Speaker: \; Clare Grey\, Professor\, Department of Chemistry\, University of Cambri dge

    Title: \;Developing and Applying New Tools to Understand How Materials for Li and "Beyond-Li" Battery Technologies Function

    Abst ract: Rechargeable batteries have been an integral part of the portable ele ctronics revolution and are now playing an increasingly important role in t ransport and grid applications\, but the introduction of these devices come s with different sets of challenges. New technologies are being investigate d\, such as those involving reactions between Li and oxygen/sulfur\, using sodium and magnesium ions instead of lithium\, or involving the flow of mat erials in an out of the electrochemical cell (in redox flow batteries). Imp ortantly\, fundamental science is key to producing non-incremental advances and to develop new strategies for energy storage and conversion. \;

    The first part of this talk will focus on our \;work to develop NMR\, M RI and \;X-ray diffraction \;methods that allow devices to be probe d while they are operating (i.e.\, \;operando). This allows tr ansformations of the various cell components to be followed under realistic conditions without having to disassemble and take apart the cell. We can d etect side reactions involving the electrolyte and the electrode materials\ , sorption processes at the electrolyte-electrode interface\, and processes that occur during extremely fast charging and discharging. \; \;Ma ny of the battery electrode materials are paramagnetic and their study has involved the development of new experimental (NMR) and theoretical approach es to acquire and interpret spectra. Recent studies to correlate lithium hy perfine shifts with local structure and to probe dynamics will be described \, focussing on studies aimed to understand degradation in NMC-811 (Li[Ni0.8Co0.1Mn0.1]O2) – graphite full cells. Finally\, new results on redox flow batteries\, extremely high rate batteries and novel NMR approaches to study interfaces will be described.& nbsp\;


    via Zoom
    Sherri Tatum
    statum12@umd.edu

He has received several awards for his research including the Isa ac Newton Medal and Prize from the Institute of Physics (UK)\, Max B orn Award from the OPTICA (formerly OSA)\, Ellis Island Medal of Honor\, IEEE Pioneer Award in Nanotechnology\, SPIE < i>Gold Medal\, the Balthasar van der Pol Gold Medal from the Internatio nal Union of Radio Science (URSI)\,the William Streifer Scientifi c Achievement Award from the IEEE Photonics Society\, induction to the Canadian Academy of Engineering as an International Fellow\, the Fellow of US National Academy of Inventors (NAI)\, the IEEE Electrom agnetics Award\, the Distinguished Achievement Award from the IE EE Antennas and Propagation Society\, the Vannevar Bush Faculty Fellowsh ip Award from DoD\, the Wheatstone Lecture in King’s College London\ , 2006 Scientific American Magazine 50 Leaders in Science and Technology\, and the Guggenheim Fellowship. \;