Induced entanglement enhanced by quantum criticality

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	Ai, Qing; Shi, Tao; Long, Guilu; Sun, C. P.; Ai, Q , Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
	Induced entanglement enhanced by quantum criticality
发表期刊	PHYSICAL REVIEW A
关键词	Renormalization-groups Superconductivity Chains
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.
	2008
ISSN	1050-2947
卷号	78 期号:2 页码:-
学科领域	Physics
收录类别	SCI
项目资助者	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]
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	理论物理所科研产出_SCI论文
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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