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题名: Induced entanglement enhanced by quantum criticality
作者: Ai, Qing ;  Shi, Tao ;  Long, Guilu ;  Sun, C. P.
刊名: PHYSICAL REVIEW A
出版日期: 2008
卷号: 78, 期号:2, 页码:-
关键词: RENORMALIZATION-GROUPS ;  SUPERCONDUCTIVITY ;  CHAINS
学科分类: Physics
通讯作者: Ai, Q , Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
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
英文摘要: 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.
资助者: National Fundamental Research Program[2006CB921106]; China National Natural Science Foundation[10325521, 60635040]
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000259263400063
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5486
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Ai, Qing,Shi, Tao,Long, Guilu,et al. Induced entanglement enhanced by quantum criticality[J]. PHYSICAL REVIEW A,2008,78(2):-.
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