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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
Source PublicationPHYSICAL REVIEW A
KeywordRenormalization-groups Superconductivity Chains
AbstractTwo-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
ISSN1050-2947
Volume78Issue:2Pages:-
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNational 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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Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5486
Collection理论物理所科研产出_SCI论文
Corresponding AuthorAi, Q , Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
Recommended Citation
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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