Induced entanglement enhanced by quantum criticality
文献类型：期刊论文
| 作者 | Ai, Qing; Shi, Tao ; Long, Guilu; Sun, C. P.; Ai, Q , Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
|
| 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 |
| ISSN号 | 1050-2947 |
| 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. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000259263400063 |
| 公开日期 | 2012-08-02 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/5486]  |
| 专题 | 理论物理研究所_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):-. |
入库方式： OAI收割
来源：理论物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。