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题名: Decay of Loschmidt echo enhanced by quantum criticality
作者: Quan, HT ;  Song, Z ;  Liu, XF ;  Zanardi, P ;  Sun, CP
刊名: PHYSICAL REVIEW LETTERS
出版日期: 2006
卷号: 96, 期号:14, 页码:-
关键词: DECOHERENCE ;  MODEL ;  TRANSITION ;  REDUCTION ;  COLLAPSE
学科分类: Physics
通讯作者: Quan, HT , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
部门归属: Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China; Peking Univ, Dept Math, Beijing 100871, Peoples R China; Inst Sci Interchange Fdn, I-10133 Turin, Italy
英文摘要: We study the transition of a quantum system S from a pure state to a mixed one, which is induced by the quantum criticality of the surrounding system E coupled to it. To characterize this transition quantitatively, we carefully examine the behavior of the Loschmidt echo (LE) of E modeled as an Ising model in a transverse field, which behaves as a measuring apparatus in quantum measurement. It is found that the quantum critical behavior of E strongly affects its capability of enhancing the decay of LE: near the critical value of the transverse field entailing the happening of quantum phase transition, the off-diagonal elements of the reduced density matrix describing S vanish sharply.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000236797200009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/6003
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, HT,Song, Z,Liu, XF,et al. Decay of Loschmidt echo enhanced by quantum criticality[J]. PHYSICAL REVIEW LETTERS,2006,96(14):-.
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