Knowledge Management System of Institute of Theoretical Physics, CAS
Ai, Qing; Shi, Tao; Long, Guilu; Sun, C. P.![]() | |
Induced entanglement enhanced by quantum criticality | |
发表期刊 | PHYSICAL REVIEW A
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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 | |
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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