Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session G06: Quantum Simulation III
10:30 AM–12:30 PM,
Wednesday, June 5, 2024
Room: 202CD
Chair: Thomas Bilitewski, Oklahoma State University
Abstract: G06.00009 : Using atom array in an optical cavity to realize Z2 and U(1) Dicke phase transition*
12:06 PM–12:18 PM
Presenter:
Yue-Hui (Leon) Lu
(University of California, Berkeley)
Authors:
Yue-Hui (Leon) Lu
(University of California, Berkeley)
Jacquelyn Ho
(University of California, Berkeley)
Zhenjie Yan
(University of California, Berkeley)
Tai Xiang
(University of California Berkeley)
Nathan Song
(UC Berkeley)
Dan M Stamper-Kurn
(University of California, Berkeley)
We study the Dicke phase transition of N~20 atomic spins coupled to a high-finesse cavity, where the atoms are tightly tweezed by a 1D optical tweezer array at the antinode of the cavity field, and illuminated from the side with a uniform-phase pump light. Such system can be effectively described by a Dicke-type Hamiltonian with a Z_2/U(1) symmetry, depending on if it is coupled to one or both polarizations of the cavity mode. At pump intensity beyond the Dicke phase transition, we observe spontaneous symmetry breaking of the cavity field phase (polarization) for the Z_2/U(1) model, accordingly. We measure the real-time dynamics of the system by performing phase-resolved heterodyne detection on both polarization of the cavity emission. We measure the final state of the atoms by performing a state-selective imaging of the atom array in the end.
One important question we are trying to answer is: how does the stability of a quantum phase transition scale with system size, especially for a mesoscopic system that is sensitive to quantum fluctuations.
*We acknowledge support from the AFOSR (Grant No. FA9550-1910328 and Young Investigator Prize Grant No. 21RT0751), from ARO through the MURI program (Grant No. W911NF-20-1-0136), from DARPA (Grant No. W911NF2010090), from the NSF (QLCI program through grant number OMA-2016245, and CAREER Award No. 2047380), and from the David and Lucile Packard Foundation.
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