Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session M11: Focus Session: Measurement Induced Phase Transitions and Quantum Simulation of Phase TransitionsFocus Live Streamed

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Chair: Steven Rolston, University of Maryland, College Park Room: Grand Ballroom E 
Wednesday, June 1, 2022 2:00PM  2:30PM 
M11.00001: Measurement induced phase transition in ground states Invited Speaker: Ehud Altman

Wednesday, June 1, 2022 2:30PM  3:00PM 
M11.00002: Observing a purification phase transition with a trapped ion quantum computer Invited Speaker: Crystal Noel

Wednesday, June 1, 2022 3:00PM  3:12PM 
M11.00003: Experimental Realization of RabiHubbard Model with Trapped Ions Quanxin Mei, Bowen Li, Yukai Wu, Minglei Cai, Ye Wang, Lin Yao, Zichao Zhou, Luming Duan Quantum simulation provides important tools in studying strongly correlated manybody systems with controllable parameters. As a hybrid of two fundamental models in quantum optics and in condensed matter physics, RabiHubbard model demonstrates rich physics through the competition between local spinboson interactions and longrange boson hopping. Here we report an experimental realization of the RabiHubbard model using up to 16 trapped ions and present a controlled study of its equilibrium properties and quantum dynamics. We observe the groundstate quantum phase transition by slowly quenching the coupling strength, and measure the quantum dynamical evolution in various parameter regimes. With the magnetization and the spinspin correlation as probes, we verify the prediction of the model Hamiltonian by comparing theoretical results in small system sizes with experimental observations. For largersize systems of 16 ions and 16 phonon modes, the effective Hilbert space dimension exceedss 2^{57}, whose dynamics is intractable for classical supercomputers. 
Wednesday, June 1, 2022 3:12PM  3:24PM 
M11.00004: Nonequilibrium critical phenomena in a trappedion quantum simulator Arinjoy De, Patrick Cook, William N Morong, Kate S Collins, Daniel A. Paz, Paraj Titum, Wen Lin Tan, Guido Pagano, Alexey V Gorshkov, Mohammad F. Maghrebi, Christopher Monroe Recent work has predicted that quenched nearintegrable systems can exhibit dynamics associated with thermal, quantum, or purely nonequilibrium phase transitions, depending on the initial state [1]. Using a trappedion quantum simulator with intrinsic longrange interactions, we investigate collective nonequilibrium properties of critical fluctuations after quantum quenches. In particular, we probe the scaling behavior of fluctuations near the critical point of the groundstate disordertoorder phase transition, after single and double quenches of the transverse field in a longrange Ising Hamiltonian. With system sizes of up to 50 ions, we show that both the postquench fluctuation magnitude and dynamics scale with system size with distinct critical exponents, charaterizing the type of phasetransition. Furthermore we demonstrate that the critical exponents after a single and a double quenches are different and correspond to effectively thermal and truly nonequilibrium behavior, respectively. Our results demonstrate the ability of quantum simulators to explore universal scaling beyond the equilibrium context. 
Wednesday, June 1, 2022 3:24PM  3:36PM 
M11.00005: LandauForbidden Quantum Criticality in Rydberg Atom Arrays Jong Yeon Lee, Joshua Ramette, Wen Wei Ho, Soonwon Choi A continuous transition between two distinct symmetry broken phases is generally forbidden to occur within the celebrated LandauGinzburgWilson theory of phase transitions. However, a quantum effect can intertwine the two symmetries, giving rise to a novel scenario called deconfined quantum criticality. In this work, we propose a model of a onedimensional array of stronglyinteracting, individually trapped neutral atoms interacting via Rydberg states, and demonstrate through extensive numerical simulations that its ground state phase diagram exhibits deconfined quantum criticality in certain parameter regimes. Moreover, we show how an enlarged, emergent continuous symmetry arises at these critical points, which can be directly observed via studying the joint distribution of two competing order parameters in the natural measurement basis. Our findings highlight quantum simulators of Rydberg atoms not only as natural platforms to experimentally realize such exotic phenomena, but also as unique ones as they allow access to physical properties not accessible in traditional condensed matter experiments. 
Wednesday, June 1, 2022 3:36PM  3:48PM 
M11.00006: Diagnosing dynamical phase transitions in Spin1 BoseEinstein condensate using classical and quantum information Qingze Guan, Robert LewisSwan Nonequilibrium dynamics has been used to probe quantum manybody physics and to perform state engineering which finds broad applications in various aspects of quantum technologies. Dynamical phase transitions (DPT), which signal different dynamical structures of a quantum system by tuning control parameters, provides a powerful tool to classify manybody dynamics in closed quantum systems. In this work, we identify an order parameter to diagnose the DPT in quench dynamics of a Spin1 BoseEinstein condensate for classical initial states (coherent spin states) which is motivated by a meanfield picture of the doublewell structure in the phase space. Beyond the classical regime, a quantum probe based on the quantum Fisher information (QFI) is shown to be able to capture such a DPT for a broader type of initial states including both coherent spin states and Fock states. The classical Fisher information (CFI), as is more realistic to be measured in Spin1 BoseEinstein condensate nowadays, is also shown to mimic the role of QFI to some degrees and is useful in diagnosing such a DPT. Both the CFI and the QFI make a smooth connection between DPTs and quantum sensing. 
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