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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
ISSN1050-2947
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]
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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
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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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