Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session S08: Many-body Dynamics with Interacting Atoms and Photons |
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Chair: Jeremy Young, JILA Room: 206 C |
Thursday, June 8, 2023 10:30AM - 10:42AM |
S08.00001: Experimental Observation of BCS Dynamical Phases in a Strontium Cavity-QED System Dylan J Young, Anjun Chu, Eric Song, Diego E Barberena, David Wellnitz, Zhijing Niu, Vera M Schäfer, Ana Maria Rey, James K Thompson Out-of-equilibrium dynamics in many-body systems can exhibit rich behavior not found in equilibrium systems. In particular, certain non-dissipative systems quenched out of equilibrium can experience distinct “dynamical phases” and corresponding phase transitions as either Hamiltonian parameters or initial conditions are tuned. The Bardeen-Cooper-Schrieffer (BCS) model of superconductivity provides a notable example: studies of this model predict the existence of three dynamical phases when a superconductor in its ground state experiences a sudden quench in interaction strength [1]. Despite this, experimental observation of all three phases in condensed matter systems has yet to be realized. Following a previous theory proposal [2], we present results simulating the BCS model using an ensemble of 88Sr atoms subject to a cavity-mediated spin-exchange interaction. By tuning both the interaction strength and the shape of the single-particle energy distribution, we observe three dynamical phases and identify them with the predicted dynamics in a quenched BCS superconductor. |
Thursday, June 8, 2023 10:42AM - 10:54AM |
S08.00002: Driven-dissipative Self-organization of Single Atomic Array in a Optical Cavity Yue-Hui (Leon) Lu, Zhenjie Yan, Jacquelyn Ho, Dan M Stamper-Kurn, Florian Zacherl Collective scattering of coherently-driven atoms into a high-finesse optical cavity allows for coherent build-up of cavity field, creating a dynamic potential that lead to spontaneous symmetry breaking. This phenomenon has been explored extensively on atomic emsembles, leading to the emergence of quantum Dicke phase transition. |
Thursday, June 8, 2023 10:54AM - 11:06AM |
S08.00003: Self-oscillating pump in a topological dissipative atom-cavity system Simon E Hertlein, Alexander Baumgärtner, Davide Dreon, Xiangliang Li, Tilman Esslinger, Tobias Donner The time evolution of an quantum system can be strongly affected by dissipation. Although this mainly implies that the system relaxes to a steady state, in some cases it can bring to the appearance of new phases and trigger emergent dynamics. In our experiment, we study a Bose-Einstein Condensate dispersively coupled to a high finesse resonator. The cavity is pumped via the atoms, such that the sum of the coupling beam(s) and the intracavity standing wave gives an optical lattice potential. When the dissipation and the coherent timescales are comparable, we find a regime of persistent oscillations where the cavity field does not reach a steady state. In this regime the atoms experience an optical lattice that periodically deforms itself, even without providing an external time dependent drive. Eventually, the dynamic lattice triggers a pumping mechanism. We will show complementary measurements of the light field and of the atomic transport, proving the connection between the emergent non-stationarity and the pump. |
Thursday, June 8, 2023 11:06AM - 11:18AM |
S08.00004: Understanding the quantum Rabi ring using analogies to quantum magnetism. Diego A Fallas Padilla, Han Pu, Guo-Jing Cheng, Yu-Yu Zhang It is not unusual that two seemingly very different systems are connected by the same underlying physics. Finding such connections can often help us gain new insights into one system by importing knowledge obtained from the study of the other. Here we show how a light-matter interacting system, named the quantum Rabi ring, can be mapped to a magnetic system with various types of magnetic exchange couplings, allowing us to study the analog of ferromagnetic and antiferromagnetic ordering, as well as chiral magnetic structures, like magnetic vortices, in this quantum optics platform. We study how the geometry of the ring affects the phase diagram of the model. Specifically, when the system contains an odd number of sites, geometrical frustration stabilizes the chiral phases, a behavior well studied in antiferromagnetic systems, allowing us to find an optical equivalent of the magnetic frustration phenomenon. This frustration not only generates a highly degenerate ground state but causes anomalous scaling exponents in the vicinity of the phase boundary. This work not only introduces a new candidate for simulation of few-body classical magnetic systems but also emphasizes how we can use our accumulated knowledge of magnetic systems to explain features of systems that might not seem to be related to the former, at least at first glance. |
Thursday, June 8, 2023 11:18AM - 11:30AM |
S08.00005: Collective Radiative Interactions of Many-Particle Systems in the Discrete Truncated Wigner Approximation Christopher D Mink, Michael Fleischhauer In a recent work [Mink et. al., Phys. Rev. Research, 4, 043136 (2022)] we have extended the Discrete Truncated Wigner Approximation, which provides a semiclassical and numerically efficient approximation to the dynamics of an interacting ensemble of two-level systems in the Wigner phase space, to dephasing and spontaneous emission. |
Thursday, June 8, 2023 11:30AM - 11:42AM |
S08.00006: Replica symmetry breaking in multimode cavity QED Henry S Hunt, Brendan Marsh, Ronen Kroeze, David Atri Schuller, Alexander Bourzutschky, Henry S Hunt, Surya Ganguli, Sarang Gopalakrishnan, Jonathan Keeling, Benjamin L Lev We numerically demonstrate that an interacting atomic spin system coupled via a multimode optical cavity can enter a spin glass regime with replica symmetry breaking (RSB). Multimode optical cavities support many degenerate transverse modes that can mediate all-to-all sign-changing spin interactions. Such a system realizes an approximate, disordered Ising model with a transverse field. We simulate the pumping of the system through the Ising transition and study individual replicas as quantum trajectories monitored under continuous measurement. A Parisi-like overlap distribution is found from the RSB that emerges via dissipation. |
Thursday, June 8, 2023 11:42AM - 11:54AM |
S08.00007: Quantum Fluctuation Dynamics of Dispersive Superradiant Pulses Kevin Stitely, Fabian Finger, Rodrigo Rosa-Medina, Tobias Donner, Tilman Esslinger, Scott Parkins, Bernd Krauskopf We consider theoretically a driven-dissipative quantum many-body system consisting of an atomic ensemble in a single-mode optical cavity as described by the open Tavis-Cummings model. In this hybrid light-matter system the interplay between coherent and dissipative processes leads to superradiant pulses with a build-up of strong correlations, even for systems comprising hundreds to thousands of particles. Its key feature is the self-reversal of two spin degrees of freedom due to a time-reversal symmetry of the model that is broken by quantum fluctuations. We demonstrate a quench protocol that can maintain highly non-Gaussian states over long time scales. This general mechanism offers interesting possibilities for the generation and control of complex fluctuation patterns, as suggested for the improvement of quantum sensing protocols for dissipative spin-amplification. |
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