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题名: Quantum critical dynamics of a qubit coupled to an isotropic Lipkin-Meshkov-Glick bath
作者: Quan, H. T. ;  Wang, Z. D. ;  Sun, C. P.
刊名: PHYSICAL REVIEW A
出版日期: 2007
卷号: 76, 期号:1, 页码:-
关键词: BODY APPROXIMATION METHODS ;  JAYNES-CUMMINGS MODEL ;  SOLVABLE MODEL ;  ANTIFERROMAGNETIC ENVIRONMENT ;  PHASE-TRANSITION ;  DICKE-MODEL ;  ENTANGLEMENT ;  DECOHERENCE ;  VALIDITY ;  SYSTEM
学科分类: Physics
通讯作者: Quan, HT , Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
部门归属: Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China; Univ Hong Kong, Ctr Theoret & Computat Phys, Hong Kong, Hong Kong, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要: We explore a dynamic signature of quantum phase transition (QPT) in an isotropic Lipkin-Meshkov-Glick (LMG) model by studying the time evolution of a central qubit coupled to it. We evaluate exactly the time-dependent purity, which can be used to measure quantum coherence, of the central qubit. It is found that distinctly different behaviors of the purity as a function of the parameter reveal clearly the QPT point in the system. It is also clarified that the present model is equivalent to an anti-Jaynes-Cummings model under certain conditions.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000248486600022
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5698
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Quan, H. T.,Wang, Z. D.,Sun, C. P.. Quantum critical dynamics of a qubit coupled to an isotropic Lipkin-Meshkov-Glick bath[J]. PHYSICAL REVIEW A,2007,76(1):-.
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