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Entropy 2016, 18(9), 319;

Quantum Hysteresis in Coupled Light–Matter Systems

Departamento de Física, Universidad de Los Andes, A.A. 4976, Bogotá 111711, Colombia
Joint Institute for Lab Astrophysics, University of Colorado, Boulder, CO 80309, USA
Department of Physics, University of Miami, Coral Gables, FL 33124, USA
Author to whom correspondence should be addressed.
Academic Editor: Martin Eckstein
Received: 28 June 2016 / Revised: 18 August 2016 / Accepted: 29 August 2016 / Published: 7 September 2016
(This article belongs to the Special Issue Quantum Nonequilibrium Dynamics)
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We investigate the non-equilibrium quantum dynamics of a canonical light–matter system—namely, the Dicke model—when the light–matter interaction is ramped up and down through a cycle across the quantum phase transition. Our calculations reveal a rich set of dynamical behaviors determined by the cycle times, ranging from the slow, near adiabatic regime through to the fast, sudden quench regime. As the cycle time decreases, we uncover a crossover from an oscillatory exchange of quantum information between light and matter that approaches a reversible adiabatic process, to a dispersive regime that generates large values of light–matter entanglement. The phenomena uncovered in this work have implications in quantum control, quantum interferometry, as well as in quantum information theory. View Full-Text
Keywords: irreversibility; light–matter entanglement irreversibility; light–matter entanglement

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Gómez-Ruiz, F.J.; Acevedo, O.L.; Quiroga, L.; Rodríguez, F.J.; Johnson, N.F. Quantum Hysteresis in Coupled Light–Matter Systems. Entropy 2016, 18, 319.

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