Quantum thermal discord in a two-spin-1/2 XXZ model |
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| Authors: | Wang Qiong Liao Jie-Qiao and Zeng Hao-Sheng |
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| Institution: | Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China; Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China |
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| 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. |
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| Keywords: | quantum discord concurrence thermal equilibrium |
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