Chinese Journal of Quantum Electronics, Volume. 29, Issue 2, 185(2012)

Quantum correlations and thermal entanglement in a two-qubit Heisenberg XXZ model with external magnetic fields

Lin XU* and Yun-jie XIA
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    The quantum correlation of a two-qubit Heisenberg XXZ model was investigated through applying two independent and controllable magnetic fields (B+b) and (B-b) on the two qubits respectively and changing the coupling parameter Jz, magnetic field B, inhomogeneous magnetic field b and temperature kT. The behavior of quantum correlation and that of thermal entanglement under one and the same parameter is compared. The results show that quantum correlation can exist for a wider parameter range than thermal entanglement. In addition, for a certain region of parameter, quantum correlation and thermal entanglement exhibit completely different behaviors.

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    XU Lin, XIA Yun-jie. Quantum correlations and thermal entanglement in a two-qubit Heisenberg XXZ model with external magnetic fields[J]. Chinese Journal of Quantum Electronics, 2012, 29(2): 185

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    Paper Information

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    Received: Mar. 29, 2011

    Accepted: --

    Published Online: Mar. 30, 2012

    The Author Email: Lin XU (qflq2004@163.com6)

    DOI:10.3969/j.issn.1007-5461. 2012.02.009

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