Discord under the influence of a quantum phase transition

doi:10.1088/1674-1056/20/5/050306

中国物理B ›› 2011, Vol. 20 ›› Issue (5): 50306-050306.doi: 10.1088/1674-1056/20/5/050306

Discord under the influence of a quantum phase transition

王林成, 申健, 衣学喜

School of Physics and Optoelectronic Technology, % Dalian University of Technology, Dalian 116024, China

收稿日期:2010-09-25 修回日期:2010-12-30 出版日期:2011-05-15 发布日期:2011-05-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10905007 and 61078011) and the Fundamental Research Funds for the Central Universities, China.

Discord under the influence of a quantum phase transition

Wang Lin-Cheng (王林成), Shen Jian (申健), Yi Xue-Xi (衣学喜)

School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China

Received:2010-09-25 Revised:2010-12-30 Online:2011-05-15 Published:2011-05-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10905007 and 61078011) and the Fundamental Research Funds for the Central Universities, China.

摘要/Abstract

摘要： 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.

关键词: quantum discord, quantum phase transition, XY spin-chain

Abstract: 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.

Key words: quantum discord, quantum phase transition, XY spin-chain

中图分类号: (Quantum information)

03.67.-a

03.65.Yz (Decoherence; open systems; quantum statistical methods) 05.70.Jk (Critical point phenomena) 75.10.Pq (Spin chain models)

王林成, 申健, 衣学喜. Discord under the influence of a quantum phase transition[J]. 中国物理B, 2011, 20(5): 50306-050306.

Wang Lin-Cheng (王林成), Shen Jian (申健), Yi Xue-Xi (衣学喜). Discord under the influence of a quantum phase transition[J]. Chin. Phys. B, 2011, 20(5): 50306-050306.

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Discord under the influence of a quantum phase transition

Discord under the influence of a quantum phase transition

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