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

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

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.

Keywords: quantum discord concurrence thermal equilibrium

Received: 23 January 2010
Revised: 19 March 2010
Accepted manuscript online:

PACS:	03.65.Ud	(Entanglement and quantum nonlocality)
	75.10.Jm	(Quantized spin models, including quantum spin frustration)

Fund: 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.

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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 2010 Chin. Phys. B 19 100311

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