A ‘Groundbreaking, Earth-Shattering, Universe-Defining’ Mission

This fall, when all the final system checks are done and the countdown ticks to the final second, NASA’s Nancy Grace Roman Space Telescope will blast off the launchpad at Kennedy Space Center—and no one will be more geeked than Jackie Townsend (B.S. ’94, physics).

“Nothing matches the pride and terror of the moment of launch,” Townsend explained. “Even for me, who does science missions—it's like watching your kid graduate and worrying they're going to trip as they walk across the stage. I will be crying. It will be a magnificent moment.”

For Townsend, Roman is the latest milestone in a 30-plus-year NASA career that included groundbreaking Hubble missions, countless spaceship materials challenges, complex weather satellite collaborations and a host of discoveries. Recently named project manager for the Roman mission, after spending more than 15 years as deputy project manager, Townsend deliberated over every detail of one of NASA’s most ambitious efforts ever, a scientific adventure that will explore the universe in ways never possible before.

“What most excites me? We’re going to record or image more than 20 billion celestial objects over the life of this mission. And when you record 20 billion of something, you’ll capture 20 thousand, one-in-a-million events—phenomena we’ve never seen before,” Townsend said. “That’s what I love about Roman. We're going to do the science that we were designed to do spectacularly well—and we’re going to find untold new areas to explore.”

Wrong turn, right career

Space wasn’t part of Townsend’s original career plan. Jackie Townsend with the Roman Space Telescope at NASA Goddard Space Flight Center. Photo courtesy of Jackie Townsend.Jackie Townsend with the Roman Space Telescope at NASA Goddard Space Flight Center. Photo courtesy of Jackie Townsend.

“When I graduated from high school, I didn’t know that I was any good at math or science, and I first went to college to study psychology,” she said. “But I found I was really bored by psychology. It did not inspire me to try harder, so after my first year, I quit.”

Townsend spent the next three years job-hopping, from farmhand to receptionist to retail, and along the way, she realized she needed a challenge, a career path that would make a difference in the world and inspire her to try so hard that she wouldn’t be afraid to fail. The answer was physics.

“I thought back to high school—what was a class I really enjoyed even though it challenged me? For me, that was physics,” she recalled. “I decided then I was going back to school.”

A few years—and many community college physics courses—later, Townsend transferred to the University of Maryland, building a strong foundation that set the stage for her future.

“At Maryland, I realized that what it was doing was teaching me how to think,” she said. “The physics degree was teaching me to think through how to solve complex problems, and that’s obviously an everyday occurrence in my job at NASA today.”

Townsend connected with NASA’s Goddard Space Flight Center and had the opportunity to conduct research there as a student.

“I didn't even know Goddard existed until I met people at Maryland who worked with Goddard. The physics department worked with me to carve out a program where I was part-time working and part-time going to school,” Townsend explained. “Even as a co-op, I had samples that had flown in space, and we were working at Goddard to characterize what had changed in those materials from their exposure to space. The connection between what was happening in the classroom and the hands-on work that I was doing at Goddard was just magnificent. It was inspirational to me.”

Blankets, cameras and sunshields in space

After graduation, Townsend’s co-op experience landed her a full-time job at Goddard as a materials engineer, where she troubleshot materials NASA was sending into space.

“I had the greatest first boss, who was really a teacher disguised as a materials engineer, and he was one of the people who pioneered how we need to test these materials and understand them if we're going to use them in space applications,” Townsend said. “He had me working on contamination control and broader space environmental effects. I had studied solid-state physics stuff at Maryland, and I learned a bunch more at Goddard, so I was becoming recognized as an up-and-coming expert in the effects of the space environment on materials.”

As her NASA career continued, Townsend’s technical expertise and her knack for solving problems made a lasting impact. She contributed to three Hubble servicing missions, improving designs to prevent cracking in the thermal blankets that protect Hubble’s delicate instruments and fine-tuning Hubble’s Wide Field Camera 3. She later collaborated with the National Oceanic and Atmospheric Administration on new weather satellites and contributed to the sunshield design for the James Webb Space Telescope.

“The Webb has this tennis court-sized sunshield, which is made of these very thin film materials—it’s like a mylar balloon or a potato chip bag. And because of my work on Hubble, I got to work with the Webb folks to define how they would test the materials to determine which ones would survive the radiation environment where they were going,” Townsend recalled. “I was able to take what I had learned and use it to help shape the choices they made for Webb.”

Preparing for launch

A contributor to the Roman telescope mission as early as 2010, Townsend became the mission’s deputy project manager in 2020. Now as project manager, she’s charged with ensuring that all of NASA’s plans, people and systems are on track for Roman’s planned launch this fall.

“We plan to launch on August 30th from the Kennedy Space Center,” she said. “All of the observatory is complete and went through environmental testing with excellent performance. The team spent May and early June doing what we call the final closeouts. Team members go through pulling off test articles that don’t fly, like accelerometers and metrology targets. The solar arrays, aperture cover and high-gain antenna were each deployed and stowed for the final time here on the ground. In mid-June, the whole observatory is installed into a big shipping container, put on a NASA barge and tugged down to Kennedy Space Center. After that, we have a little over two months’ work to get it onto the launch vehicle and ready for launch on August 30.”

The Roman mission will offer virtually limitless opportunities to investigate a wide range of astrophysics topics, building a massive data archive that will allow scientists to identify and study 100,000 exoplanets, hundreds of millions of galaxies and billions of stars. Townsend believes that keeping this Roman mission on track and on budget will pave the way for even more ambitious missions in the future.

“I'm not a scientist like the Ph.D.s that will use Roman data to do that groundbreaking science, but I am a world-class technical project manager and space architect. This amazing team not only enabled Roman by charting this path, we enabled what's to come. We will be allowed to tackle new, incredibly ambitious missions in the future because of the way we executed on Roman,” Townsend said. “And, to circle all the way back, that's the same problem-solving I learned in the University of Maryland physics department. That same way of thinking about how to tackle really complex problems in a methodical, logical, systemic way is how Roman delivered.”

And for Townsend, whose career in space has been nothing short of stellar, this mission could be the most memorable ever.

“I feel like all the missions I've worked on have been different—kind of like my path to physics and my path to NASA. It’s been this wild ride I never could have predicted or planned. I got here just hanging on and digging into work the problems and get the job done,” she said. “The Roman observatory is fantastic, and it’s going to do groundbreaking, earth-shattering, universe-defining science, and that is really exciting.”

 

Original story: https://cmns.umd.edu/news-events/news/Jackie-townsend-roman-space-telescope-physics-mission

 

A New Kind of Entanglement Helps Quantum Sensors Tune Out Noise

In a quest to build the most accurate sensors in the world, scientists are constantly improving their performance. Making them more precise, stable and reliable. Photon exchange through an optical cavity links two atomic ensembles, creating a shared entangled state. This entanglement is designed to be insensitive to common noise while remaining highly sensitive to differential signals. (Credit: Raphael Kaubruegger, JILA)Photon exchange through an optical cavity links two atomic ensembles, creating a shared entangled state. This entanglement is designed to be insensitive to common noise while remaining highly sensitive to differential signals. (Credit: Raphael Kaubruegger, JILA)

But eventually, physical constraints will prevent further improvements. 

“By fully embracing the laws of quantum physics, one can expand the performance limits imposed by these constraints,” says JQI Fellow Alexey Gorshkov, who is also a Physicist at the National Institute of Standards and Technology (NIST), a Fellow of the Joint Center for Quantum Information and Computer Science and an Associate Professor in the Department of Physics at the University of Maryland. “And it's very exciting to come up with protocols that come as close as possible to saturating these limits for different sensing tasks.”

Even the most precise sensors in the world are not fully isolated and are limited by noise—subtle disturbances from the environment like vibrations, electromagnetic fields or temperature changes. 

So, Gorshkov, JILA Fellows Ana Maria Rey and James K. Thompson and their colleagues from the Niels Bohr Institute and the Indian Institute of Technology Madras, asked, how can we improve the next generation of sensors despite these limitations? 

One promising idea is to use quantum entanglement, so atoms are connected to each other and working together as a system to form a quantum sensor. When atoms are entangled, they share properties even when separated by distance. In principle, this allows for more precise measurements. But entangled atoms are still subject to noise. “Entangled states are well understood for estimating a single parameter, but our goal was to create an entangled state that is highly sensitive to a parameter difference between two nodes of a sensor network,” says Raphael Kaubruegger, a research associate at JILA and the lead author of the article. 

The researchers set out to identify a new class of entangled states that could filter out noise affecting both sensors. They then developed two ways to create these states inside an optical cavity, a pair of mirrors about one inch apart that bounce photons back and forth. They describe the state and two methods to create it in a recent paper published in Physical Review X

The entangled state they identified uses decoherence-free subspaces which are protected from certain types of disturbances to quiet noise affecting both sensors. 

Lasers are used to create coherent superposition between two internal states of an atom, but to accomplish that, the laser’s frequency needs to exactly match the atomic transition. 

The challenge, as Rey explains, is that even the most precise lasers cannot maintain a stable frequency for long enough. These laser frequency instabilities generate noise which is equally experienced by both sensors and is currently one of the most detrimental errors in state-of-the-art clocks. “Ideally, one would like to prepare the atoms in a state that is insensitive to this type of noise,” says Rey, who is also a NIST fellow and professor adjoint of physics at the University of Colorado Boulder. 

“The state we create is entanglement between these atoms, but in a way that you cannot distinguish which atom is in which ensemble,” Rey says. “They are fully symmetrized.” 

“After the fact, we realized this was the same kind of state people were thinking about to describe antiferromagnets, or quantum magnets,” says Thompson, who is also NIST fellow and professor adjoint of physics at the University of Colorado Boulder. 

In condensed matter physics, the Lieb-Mattis state describes a quantum version of an antiferromagnet, where two groups of atoms act like they point in opposite directions, but without the system picking one fixed direction in space. 

One method the team developed to prepare the desired state involves entangling two nodes of a sensor network by engineering a “spin exchange,” by having the atoms send photons back and forth through an optical cavity. This leads to a state where each atom in one node is perfectly anticorrelated with an atom in the other. If one atom is “up,” the other atom is “down.” 

Thompson likens this approach to baseball, where each ensemble is a baseball team. The teams are throwing balls, or in this case photons, to each other. Every time a ball is thrown, the other team catches it. Thompson adds that it’s important that we don’t know which player threw the ball or who caught it. 

“That’s what builds these links,” Thompson says. “If a ball is thrown, it is definitely caught.” 

The approach produces Heisenberg scaling, or the best possible precision scaling where all the atoms act as one quantum object. 

Optical cavities are not perfect. As Rey explains, sometimes you may lose a photon. The team’s second approach takes this into account. 

Inside the optical cavity, photons can bounce back and forth between very reflective mirrors about 100,000 times before they accidentally slip through to the other side. 

“We are losing photons, but the important part is that the photons are lost in a collective way,” Rey says. 

Because it’s impossible to tell which atom is to blame, this can create entanglement—driving them into a state where they cannot lose more photons. 

“At some point they get really good at not dropping the ball anymore,” Thompson says. 

“They go into a ‘dark state,’ or a state where the phases of the emitted photons completely cancel out, leading to what it is known as destructive interference,” Rey adds. 

The team was initially trying to understand the detrimental effect of losing those photons. But as Rey explains, ultimately this type of dissipation actually led them to a state they wanted. 

“The state we initially wanted to prepare was one in which half the atoms are excited, but the system cannot collectively emit a photon,” Kaubruegger adds. 

The team’s proposed states can be created quickly, and more importantly, faster as the system gets larger, making them practical for scaling quantum sensors. 

“People have thought about this kind of state when you only have two atoms, which is cool, but you’d like to use more,” Thompson says. “It turns out, the more atoms you have, the better!” 

By making quantum sensors more precise, these entangled states could one day help guide navigation when GPS is unavailable or reveal hidden underground resources such as minerals, oil or gas. 

Close collaborations between theorists and experimentalists have been key to this work. The groups inspire each other—and keep each other in check. Because they work so closely together, Kaubruegger says they have a deeper understanding of the challenges experimentalists face. 

And now, the ball, so to speak, is in Thompson’s group’s hands; to demonstrate the state in experiment.

This text has been adapted with permission from a story written by Kirsten Apodaca and originally published by JILA. It has been adapted with minor changes here.

 

Childhood Physics Fun Leads to Twin PhDs

When Sylvester James Gates III (B.S. ’15, biological sciences) graduates from the University of Maryland with his Ph.D. in biological sciences this month, it will be a family affair—and a homecoming. 

Sylvester grew up near College Park. His father, Distinguished University Professor of Physics Sylvester James Gates Jr., who goes by Jim, holds the Clark Leadership Chair in Science and has been at UMD since 1984. As kids, Sylvester and his twin, Delilah Gates (B.S. ’15, physics; B.S. ’15, mathematics), spent their free days with their dad in the John S. Toll Physics BuildingThe Gates family after Sylvester's graduation. From left: Sylvester James Gates Jr., Sylvester James Gates III, Delilah Gates, Dianna Abney. Photo courtesy of Sylvester James Gates III.The Gates family after Sylvester's graduation. From left: Sylvester James Gates Jr., Sylvester James Gates III, Delilah Gates, Dianna Abney. Photo courtesy of Sylvester James Gates III.

“The university always felt like a second home to me,” Sylvester said. 

So it was no surprise that both twins chose to stay in College Park for their bachelor’s degrees and they both became scientists. 

After graduating from UMD, Delilah earned her Ph.D. in physics from Harvard University in 2021, where she studied black holes in space. She completed a Future Faculty in the Physical Sciences Fellowship at Princeton University and then returned to Harvard as a postdoctoral fellow at the Center for Astrophysics | Harvard & Smithsonian and a member of the Black Hole Initiative. 

Sylvester, meanwhile, spent a brief stint in graduate school at Duke University before returning to Maryland for his Ph.D., where he studied how brain cells communicate. Working with Physics Professor Wolfgang Losert, Sylvester’s Ph.D. research developed new, nontraditional ways to measure brain cell activity—for example, by monitoring ions, stress compounds and the cell’s internal skeleton. He argues that gaining a more holistic picture of how the brain works could lead to more powerful artificial neural networks for computing and better drug discovery for brain diseases. 

When Sylvester presented this work during his dissertation defense in April, his whole family came to campus to watch. This month, they’ll return once more to cheer him on as he walks across the graduation stage. The milestone marks the end of a challenging but rewarding graduate school journey. 

“I'm incredibly proud of Sylvester,” Delilah said. “He's an amazing guy, as both a scientist and a human.”

Two Science Terps Are Born

What exactly does a kid do when they’re dragged into a university physics building? Actually, quite a lot, Sylvester and Delilah said. 

They have fond childhood memories of playing with physics demonstrations, mingling with employees and learning Japanese from a department staff member. Delilah even recalls playing physicist—much like many kids play doctor—scribbling gibberish on her dad’s blackboard and notepads as she pretended to do complex calculations. 

In many ways, the twins took after their parents. Their mother, Dianna Abney, is a pediatrician, child abuse specialist and the health officer for Charles County, Maryland. Like the kids, one of their parents studies physics, and the other is in the life sciences. Still, neither kid felt pressured by their parents to be scientists. In fact, both twins played the clarinet and considered majoring in music at UMD. 

“Though I have been deeply passionate about reaching my wish of becoming a scientist starting at age 4—as is similar to the case of my wife, Dianna, whose wish to become a medical doctor began around age 8—we shared a belief that parents should provide a safe environment with some structure, but stay out of the children's lanes of determining their lives' ambitions,” Jim said. 

That’s not to say Jim and Dianna did not influence their children’s careers at all. They were friends with other doctors, professors, lawyers and people with advanced degrees. Being around them helped the twins understand what went into pursuing those career paths, Delilah said. And, they were always invited to chat with the adults. 

“A lot of things that some people might think are hard discussions about science, the universe, planets, biology and medicine were commonplace, because that's just the language my mom and dad spoke,” Sylvester said. 

He added that representation was important. 

“It never felt like science was unapproachable to me,” Sylvester said. “This is one of the reasons why I believe that representation matters. Having a father and mother who were, respectively, a physicist and a pediatrician, both doctors in their own right, made being a doctor seem like something that my sister and I could do.”

Diverging Disciplines

Now that they’re both scientists, the twins study the world on vastly different scales—Sylvester works on microscopic cells, while Delilah researches the vast cosmos. The two siblings always had distinct dispositions, Sylvester said. He was always more artsy, and his sister was more drawn to math. So, he’s not surprised their interests diverged. 

Delilah initially planned to study particle physics like her father, but after taking a cosmology class in graduate school, she became fascinated by black holes. She was drawn to the discipline’s strong mathematical framework, which, like particle physics, builds on concepts like field theory and general relativity. Now, as a theoretical physicist, she’s developing new ways to measure the spin of black holes—a question that has vast implications for understanding how galaxies form and evolve.  

As for Sylvester, when he went to Duke University, he was planning to study cancer for his Ph.D. But living away from Maryland for the first time, he experienced culture shock—from the slower pace of life and the distance from the community he had spent two decades developing. For a year and a half, he struggled with his mental health and imposter syndrome. 

“Then, I was like, ‘I cannot do graduate school at this point in time,’” Sylvester said. “So I came back to Maryland. Thankfully, I had great support, so I was able to rebuild my scientific confidence.” 

Growing Together by Moving Apart

It was difficult for Delilah to watch her twin struggle, but ultimately, it brought them closer. Until that point in their lives, they had lived close enough to see each other and speak regularly. But they had to learn to be there for each other now that they lived hundreds of miles apart. 

“Him having struggled taught us how to support each other in a new way,” Delilah said. “It was difficult at first learning to be in different places and on different timelines, but it taught us a new way to communicate and connect.” 

The Gates family in 2015.The Gates family in 2015.When Delilah faced her own challenges about halfway through graduate school, that bond was invaluable.

“I always say I don't think I'll have a midlife crisis because I went through graduate school. I was struggling quite a lot. I was having severe anxiety. And it was to the point I would cry every day, sometimes several times a day,” she said. “I remember I used to call Sylvester most mornings and talk to him on the way to work, because talking to him made me less anxious.”

After supporting each other through tough times, the twins are closer than ever. They’re best friends and speak every day, whether that’s through text messages, phone calls or wordless exchanges of memes. After watching Sylvester bounce back from his struggles, Delilah was overjoyed as she watched her brother finally defend his Ph.D. It was her first time watching him deliver a scientific lecture, and she noted how calm, cool and collected he was—and also how well-dressed. 

“He's so much more fashionable than me,” she said with a laugh. “He looked really sharp.”

Delilah got emotional as she recounted the day’s events. 

“I was the last one he shouted out in detail in his acknowledgments, and I just bawled. I couldn't contain my joy and pride. I was so happy for him,” she said. “Even thinking about it now, I get a little verklempt.” 

Their father felt the same way. 

“It would take me writing a magnum opus to really express my feelings in the defense,” Jim said.

Now that he’s completed his Ph.D., Sylvester is still figuring out what’s next. He’s open to academia, or maybe a career in government or industry. Wherever he lands, he wants to continue studying how the brain works, whether that means developing artificial neural networks for computing, medicines for neurodegenerative diseases like Alzheimer’s or interventions to help military veterans dealing with brain trauma. 

And although the twins’ physics professor dad never pushed either child to pursue science, he’s thrilled by their accomplishments now that they have chosen the path for themselves. 

“Raising them was amazing. My wife and I still say that there is nothing else in life that we have done that was more fun,” Jim said. 

It’s hard for him to find the words to describe how he feels witnessing his children’s success. So, he turns to something of a family heirloom—cherished words his father once shared with him. 

“After I became the John S. Toll Professor of Physics, my father said to me, ‘You have exceeded any and all expectations that your mother, Charlie, and I ever had of and for you,” Jim said. “My twins have accomplished that also for their parents.”

Lepton Flavor Universality Tests Using Bc+ Decays at LHCb

UMD graduate student Emily Jiang delivered a CERN seminar on May 19, 2026, unveiling an important new result on studies of Lepton Flavor Universality using decays of the heaviest B meson, Bc+, which has quark contents of a bottom-quark and anti-charm quark.   

The result is primarily the work of Jiang, UMD alumnus Zishuo Yang (Ph.D., 2023), Phoebe Hamilton and Hassan Jawahery, members of the Large Hadron Collider beauty experiment (LHCb) at CERN in Geneva, Switzerland.  It was a seven-year effort undertaken while the UMD group was also working on the development and construction of the new LHCb detector.LHCbLHCb

These results are of significant interest in the field because they show deviation from the Standard Model predictions. Previous measurements of similar quantities using the light B mesons from the BaBar experiment at SLAC, Belle Experiment at the KEK laboratory in Japan and the LHCb experiment at CERN are also in tension with the Standard Model. The new results show a similar trend, reinforcing the effect and has been highly anticipated in the field.

Jiang’s presentation can be seen here: https://indico.cern.ch/event/1685950/attachments/3277204/5855756/26-04-23_ejiang_CERN_seminar.pdf

For further information:

https://bolek.web.cern.ch/RJpsi/

https://lhcb-outreach.web.cern.ch/2026/05/19/lepton-flavor-universality-tests-using-bc-decays-at-lhcb/