Phase transition of Bose–Einstein condensate under decoherence

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

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.

Keywords: Bose–Einstein condensate phase transition operator fidelity

Received: 28 April 2013
Revised: 16 July 2013
Accepted manuscript online:

PACS:	64.60.-i	(General studies of phase transitions)
	03.75.Mn	(Multicomponent condensates; spinor condensates)
	03.75.Kk	(Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11065005) and the Creative Talent Programme in University of Guizhou Province, China.

Corresponding Authors: Hu Chang-Gang
E-mail: hudmtop01@sina.com

About author: 64.60.-i; 03.75.Mn; 03.75.Kk

Cite this article:

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

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