Phase transition of Bose–Einstein condensate under decoherence

doi:10.1088/1674-1056/23/2/026401

中国物理B ›› 2014, Vol. 23 ›› Issue (2): 26401-026401.doi: 10.1088/1674-1056/23/2/026401

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Phase transition of Bose–Einstein condensate under decoherence

郑强^a, 易善峰^a, 胡长刚^b

a School of Mathematics and Computer Science, Guizhou Normal University, Guiyang 550001, China;
b School of Chemistry and Material Science, Guizhou Normal University, Guiyang 550001, China

收稿日期:2013-04-28 修回日期:2013-07-16 出版日期:2013-12-12 发布日期:2013-12-12
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11065005) and the Creative Talent Programme in University of Guizhou Province, China.

Phase transition of Bose–Einstein condensate under decoherence

Zheng Qiang (郑强)^a, Yi Shan-Feng (易善峰)^a, Hu Chang-Gang (胡长刚)^b

a School of Mathematics and Computer Science, Guizhou Normal University, Guiyang 550001, China;
b School of Chemistry and Material Science, Guizhou Normal University, Guiyang 550001, China

Received:2013-04-28 Revised:2013-07-16 Online:2013-12-12 Published:2013-12-12
Contact: Hu Chang-Gang E-mail:hudmtop01@sina.com
About author:64.60.-i; 03.75.Mn; 03.75.Kk
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11065005) and the Creative Talent Programme in University of Guizhou Province, China.

摘要/Abstract

摘要： The effect of decoherence on the phase transition of a Bose–Einstein condensate in a symmetric double-well potential is determined by the mean atom number difference. It still has two phases, the tunneling phase and the self-trapping phase, even under decoherence. The density matrix and the operator fidelity also show very different behaviors in the two phases. This suggests that operator fidelity can be used to characterize the phase transition of this Bose–Einstein condensate model, even under decoherence.

关键词: Bose–, Einstein condensate, phase transition, operator fidelity

Abstract: The effect of decoherence on the phase transition of a Bose–Einstein condensate in a symmetric double-well potential is determined by the mean atom number difference. It still has two phases, the tunneling phase and the self-trapping phase, even under decoherence. The density matrix and the operator fidelity also show very different behaviors in the two phases. This suggests that operator fidelity can be used to characterize the phase transition of this Bose–Einstein condensate model, even under decoherence.

Key words: Bose–Einstein condensate, phase transition, operator fidelity

中图分类号: (General studies of phase transitions)

64.60.-i

03.75.Mn (Multicomponent condensates; spinor condensates) 03.75.Kk (Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)

郑强, 易善峰, 胡长刚. Phase transition of Bose–Einstein condensate under decoherence[J]. 中国物理B, 2014, 23(2): 26401-026401.

Zheng Qiang (郑强), Yi Shan-Feng (易善峰), Hu Chang-Gang (胡长刚). Phase transition of Bose–Einstein condensate under decoherence[J]. Chin. Phys. B, 2014, 23(2): 26401-026401.

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Phase transition of Bose–Einstein condensate under decoherence

Phase transition of Bose–Einstein condensate under decoherence

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