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题名: Quantum thermalization of two coupled two-level systems in eigenstate and bare-state representations
作者: Liao, JQ ;  Huang, JF ;  Kuang, LM
刊名: PHYSICAL REVIEW A
出版日期: 2011
卷号: 83, 期号:5, 页码:52110
关键词: STATISTICAL-MECHANICS ;  FLUCTUATION THEOREM ;  ENTANGLEMENT ;  FOUNDATIONS ;  BATHS
学科分类: Physics
通讯作者: Liao, JQ (reprint author), Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China.
部门归属: [Liao, Jie-Qiao; Huang, Jin-Feng] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China; [Liao, Jie-Qiao] Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China; [Liao, Jie-Qiao] Chinese Univ Hong Kong, Inst Theoret Phys, Shatin, Hong Kong, Peoples R China; [Huang, Jin-Feng; Kuang, Le-Man] Hunan Normal Univ, Minist Educ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China; [Huang, Jin-Feng; Kuang, Le-Man] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, 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.
资助者: NSFC [11075050]; NFRPC [2007CB925204]; PCSIRT [IRT0964]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000290438300001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14353
Appears in Collections:理论物理所2011年知识产出_期刊论文

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Recommended Citation:
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.
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