Induced entanglement enhanced by quantum criticality

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	Induced entanglement enhanced by quantum criticality
	Ai, Qing; Shi, Tao; Long, Guilu; Sun, C. P.; Ai, Q , Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
	2008
发表期刊	PHYSICAL REVIEW A
ISSN	1050-2947
卷号	78 期号:2 页码:-
摘要	Two-qubit entanglement can be induced by a quantum data bus interacting with them. In this paper, with the quantum spin chain in the transverse field as an illustration of the quantum data bus, we show that such induced entanglement can be enhanced by the quantum phase transition (QPT) of the quantum data bus. We consider two external spins simultaneously coupled to a transverse field Ising chain. By adiabatically eliminating the degrees of the chain, the effective coupling between these two spins is obtained. The matrix elements of the effective Hamiltonian are expressed in terms of the dynamical structure factor (DSF) of the chain. The DSF is the Fourier transformation of the Green function of an Ising chain and can be calculated numerically by a method introduced by Derzhko and Krokhmalskii [Phys. Rev. B 56, 11659 (1997)]. Since all characteristics of QPT are embodied in the DSF, the dynamical evolution of the two external spins displays singularity in the vicinity of the critical point.
部门归属	[Ai, Q; Long, GL] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China; [Shi, T; Sun, CP] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; [Long, GL] Tsinghua Natl Lab Informat Sci & Technol, Beijing 100084, Peoples R China
关键词	Renormalization-groups Superconductivity Chains
学科领域	Physics
资助者	National Fundamental Research Program[2006CB921106]; China National Natural Science Foundation[10325521, 60635040] ; National Fundamental Research Program[2006CB921106]; China National Natural Science Foundation[10325521, 60635040] ; National Fundamental Research Program[2006CB921106]; China National Natural Science Foundation[10325521, 60635040] ; National Fundamental Research Program[2006CB921106]; China National Natural Science Foundation[10325521, 60635040]
URL	查看原文
收录类别	SCI
资助者	National Fundamental Research Program[2006CB921106]; China National Natural Science Foundation[10325521, 60635040] ; National Fundamental Research Program[2006CB921106]; China National Natural Science Foundation[10325521, 60635040] ; National Fundamental Research Program[2006CB921106]; China National Natural Science Foundation[10325521, 60635040] ; National Fundamental Research Program[2006CB921106]; China National Natural Science Foundation[10325521, 60635040]
WOS记录号	WOS:000259263400063
引用统计	被引频次：22[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.itp.ac.cn/handle/311006/5486
专题	理论物理所1978-2010年知识产出
通讯作者	Ai, Q , Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
推荐引用方式 GB/T 7714	Ai, Qing,Shi, Tao,Long, Guilu,et al. Induced entanglement enhanced by quantum criticality[J]. PHYSICAL REVIEW A,2008,78(2):-.
APA	Ai, Qing,Shi, Tao,Long, Guilu,Sun, C. P.,&Ai, Q , Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China.(2008).Induced entanglement enhanced by quantum criticality.PHYSICAL REVIEW A,78(2),-.
MLA	Ai, Qing,et al."Induced entanglement enhanced by quantum criticality".PHYSICAL REVIEW A 78.2(2008):-.

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