Quantum thermal discord in a two-spin-1/2 XXZ model

doi:10.1088/1674-1056/19/10/100311

中国物理B ›› 2010, Vol. 19 ›› Issue (10): 100311-100311.doi: 10.1088/1674-1056/19/10/100311

Quantum thermal discord in a two-spin-1/2 XXZ model

廖洁桥¹, 王琼², 曾浩生²

(1)Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China; (2)Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China

收稿日期:2010-01-23 修回日期:2010-03-19 出版日期:2010-10-15 发布日期:2010-10-15
基金资助:
Project supported by the National Fundamental Research Program of China (Grant No. 2007CB925204), the National Natural Science Foundation of China (Grant No. 10775048), the Key Project of the Chinese Ministry of Education (Grant No. 206103), and the Construction Program of the National Key Discipline.

Quantum thermal discord in a two-spin-1/2 XXZ model

Wang Qiong(王琼)^a), Liao Jie-Qiao(廖洁桥)^b), and Zeng Hao-Sheng(曾浩生)^a)†

^a Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China; ^b Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2010-01-23 Revised:2010-03-19 Online:2010-10-15 Published:2010-10-15
Supported by:
Project supported by the National Fundamental Research Program of China (Grant No. 2007CB925204), the National Natural Science Foundation of China (Grant No. 10775048), the Key Project of the Chinese Ministry of Education (Grant No. 206103), and the Construction Program of the National Key Discipline.

摘要/Abstract

摘要： We study the quantum discord in a two-spin-1/2 XXZ model in thermal equilibrium at temperature T in the presence of an external magnetic field B. Special attention is paid to the dependence of quantum discord on the temperature T and magnetic field B. It is found that quantum thermal discord is more robust than concurrence against temperature, in the sense that quantum thermal discord does not vanish at finite temperatures, but concurrence vanishes completely at a critical temperature.

Abstract: We study the quantum discord in a two-spin-1/2 XXZ model in thermal equilibrium at temperature T in the presence of an external magnetic field B. Special attention is paid to the dependence of quantum discord on the temperature T and magnetic field B. It is found that quantum thermal discord is more robust than concurrence against temperature, in the sense that quantum thermal discord does not vanish at finite temperatures, but concurrence vanishes completely at a critical temperature.

Key words: quantum discord, concurrence, thermal equilibrium

中图分类号: (Entanglement and quantum nonlocality)

03.65.Ud

75.10.Jm (Quantized spin models, including quantum spin frustration)

王琼, 廖洁桥, 曾浩生. Quantum thermal discord in a two-spin-1/2 XXZ model[J]. 中国物理B, 2010, 19(10): 100311-100311.

Wang Qiong(王琼), Liao Jie-Qiao(廖洁桥), and Zeng Hao-Sheng(曾浩生). Quantum thermal discord in a two-spin-1/2 XXZ model[J]. Chin. Phys. B, 2010, 19(10): 100311-100311.

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Quantum thermal discord in a two-spin-1/2 XXZ model

Quantum thermal discord in a two-spin-1/2 XXZ model

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