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	Decay of Loschmidt echo enhanced by quantum criticality
	Quan, HT ; Song, Z ; Liu, XF ; Zanardi, P ; Sun, CP
	2006
关键词	DECOHERENCE MODEL TRANSITION REDUCTION COLLAPSE
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.; Physics, Multidisciplinary; SCI(E); EI; 280; ARTICLE; 14; 1-4; 96
语种	英语
出处	SCI ; EI
出版者	物理评论快报
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/398857]
专题	数学科学学院
推荐引用方式 GB/T 7714	Quan, HT,Song, Z,Liu, XF,et al. Decay of Loschmidt echo enhanced by quantum criticality. 2006-01-01.

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