Decay of Loschmidt echo enhanced by quantum criticality

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	Decay of Loschmidt echo enhanced by quantum criticality
	Zanardi, P; Quan, HT , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Sun, CP; Quan, HT; Song, Z; Liu, XF
刊名	PHYSICAL REVIEW LETTERS
	2006
卷号	96 期号:14 页码:-
关键词	Decoherence Model Transition Reduction Collapse
ISSN号	0031-9007
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.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000236797200009
公开日期	2012-08-02
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/6003]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Quan, HT , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Zanardi, P,Quan, HT , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China,Sun, CP,et al. Decay of Loschmidt echo enhanced by quantum criticality[J]. PHYSICAL REVIEW LETTERS,2006,96(14):-.
APA	Zanardi, P,Quan, HT , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China,Sun, CP,Quan, HT,Song, Z,&Liu, XF.(2006).Decay of Loschmidt echo enhanced by quantum criticality.PHYSICAL REVIEW LETTERS,96(14),-.
MLA	Zanardi, P,et al."Decay of Loschmidt echo enhanced by quantum criticality".PHYSICAL REVIEW LETTERS 96.14(2006):-.