CMTC-QuICS Seminar

Tue, Aug 11, 2020 11:00 am - 12:00 pm


Speaker: Dmitry Green 

Title: A superconducting circuit realization of combinatorial gauge symmetry

Abstract: We propose an integrated superconducting circuit design in combination with a general symmetry principle – combinatorial gauge symmetry – to build artificial quantum spin liquids that serve as foundation for the construction of topological qubits. The superconducting wire arrays exhibit rich features. In the classical limit of large capacitances its ground state consists of two superimposed spin liquids; one is a crystal of small loops containing disordered U(1) degrees of freedom, and the other is a soup of loops of all sizes associated to Z_2 topological order. We show that the classical results carry over to the quantum case when fluctuations are gradually tuned via the wire capacitances, yielding Z_2 quantum topological order. In an extreme quantum limit where the capacitances are all small, we arrive at an effective quantum spin Hamiltonian that we conjecture would sustain Z_2 quantum topological order with a gap of the order of the Josephson coupling in the array.

Host Prof. Victor Galitski

Email This email address is being protected from spambots. You need JavaScript enabled to view it. for Zoom details 

Upcoming Events

21 Sep
JQI Seminar (Virtual)
Date Mon, Sep 21, 2020 11:00 am - 12:00 pm
21 Sep
Online EPT Seminar
Mon, Sep 21, 2020 3:00 pm - 4:30 pm
21 Sep
Biophysics Seminar
Mon, Sep 21, 2020 4:00 pm - 5:00 pm
21 Sep
PHYS838C Seminar: Rahul Sharma, UMD
Mon, Sep 21, 2020 4:00 pm - 5:30 pm
22 Sep
CMTC Seminar
Tue, Sep 22, 2020 11:00 am - 12:00 pm