Quantum thermalization of two coupled two-level systems in eigenstate and bare-state representations

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	Quantum thermalization of two coupled two-level systems in eigenstate and bare-state representations
	Liao, JQ ; Huang, JF ; Kuang, LM
刊名	PHYSICAL REVIEW A
	2011
卷号	83 期号:5 页码:52110
关键词	STATISTICAL-MECHANICS FLUCTUATION THEOREM ENTANGLEMENT FOUNDATIONS BATHS
ISSN号	1050-2947
通讯作者	Liao, JQ (reprint author), Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China.
英文摘要	We study analytically the quantum thermalization of two coupled two-level systems (TLSs), which are connected with either two independent heat baths (IHBs) or a common heat bath (CHB). We understand the quantum thermalization in eigenstate and bare-state representations when the coupling between the two TLSs is stronger and weaker than the TLS-bath couplings, respectively. In the IHB case, we find that, when the two IHBs have the same temperatures, the two coupled TLSs in eigenstate representation can be thermalized with the same temperature as those of the IHBs. However, in the case of two IHBs at different temperatures, just when the energy detuning between the two TLSs satisfies a special condition, the two coupled TLSs in eigenstate representation can be thermalized with an immediate temperature between those of the two IHBs. In bare-state representation, we find a counterintuitive phenomenon that, under some conditions, the temperature of the TLS connected with the high-temperature bath is lower than that of the other TLS, which is connected with the low-temperature bath. In the CHB case, the coupled TLSs in eigenstate representation can be thermalized with the same temperature as that of the CHB in nonresonant cases. In bare-state representation, the TLS with a larger energy separation can be thermalized to a thermal equilibrium with a lower temperature. In the resonant case, we find a phenomenon of antithermalization. We also study the steady-state entanglement between the two TLSs in both the IHB and CHB cases.
学科主题	Physics
收录类别	SCI
资助信息	NSFC [11075050]; NFRPC [2007CB925204]; PCSIRT [IRT0964]
原文出处	http://dx.doi.org/10.1103/PhysRevA.83.052110
语种	英语
WOS记录号	WOS:000290438300001
公开日期	2013-05-17
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/14353]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Liao, JQ,Huang, JF,Kuang, LM. Quantum thermalization of two coupled two-level systems in eigenstate and bare-state representations[J]. PHYSICAL REVIEW A,2011,83(5):52110.
APA	Liao, JQ,Huang, JF,&Kuang, LM.(2011).Quantum thermalization of two coupled two-level systems in eigenstate and bare-state representations.PHYSICAL REVIEW A,83(5),52110.
MLA	Liao, JQ,et al."Quantum thermalization of two coupled two-level systems in eigenstate and bare-state representations".PHYSICAL REVIEW A 83.5(2011):52110.