Nonlinear Dicke Quantum Phase Transition and Its Quantum Witness in a Cavity-Bose–Einstein-Condensate System
Wang-Jun Lu, Zhen Li, Le-Man Kuang**
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control (Ministry of Education), Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081
Abstract :We investigate nonlinear Dicke quantum phase transition (QPT) induced by inter-atomic nonlinear interaction and its quantum witness in a cavity-Bose–Einstein-condensate (BEC) system. It is shown that inter-atomic nonlinear interaction in a cavity BEC system can induce first-order Dicke QPT. It is found that this nonlinear Dicke QPT can happen in an arbitrary coupling regime of the cavity and atoms. It is demonstrated that the quantum speed limit time can witness the Dicke QPT through its sudden change at the critical point of the QPT.
收稿日期: 2018-07-19
出版日期: 2018-10-23
:
64.70.Tg
(Quantum phase transitions)
37.30.+i
(Atoms, molecules, andions incavities)
42.50.Pq
(Cavity quantum electrodynamics; micromasers)
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