Discord under the influence of a quantum phase transition

This paper studies the discord of a bipartite two-level system coupling to an XY spin-chain environment in a transverse field and investigates the relationship between the discord property and the environment＇s quantum phase transition. The results Show that the quantum discord is also able to chara...

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Published inChinese physics B Vol. 20; no. 5; pp. 66 - 72
Main Author 王林成 申健 衣学喜
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.05.2011
Subjects
Entanglement
Joining
Phase transformations
和谐
横向场
环境
相变
耦合系统
自旋链
表征
量子纠缠
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Summary:This paper studies the discord of a bipartite two-level system coupling to an XY spin-chain environment in a transverse field and investigates the relationship between the discord property and the environment＇s quantum phase transition. The results Show that the quantum discord is also able to characterize the quantum phase transitions. We also discuss the difference between discord and entanglement, and show that quantum discord may reveal more general information than quantum entanglement for characterizing the environment＇s quantum phase transition.
Bibliography:quantum discord, quantum phase transition, XY spin-chain
This paper studies the discord of a bipartite two-level system coupling to an XY spin-chain environment in a transverse field and investigates the relationship between the discord property and the environment＇s quantum phase transition. The results Show that the quantum discord is also able to characterize the quantum phase transitions. We also discuss the difference between discord and entanglement, and show that quantum discord may reveal more general information than quantum entanglement for characterizing the environment＇s quantum phase transition.
Wang Lin-Cheng, Shen Jian, Yi Xue-Xi school of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China （Received 25 September 2010; revised manuscript received 30 December 2010）
11-5639/O4
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ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/5/050306