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
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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Received: Mar. 29, 2011
Accepted: --
Published Online: Mar. 30, 2012
The Author Email: Lin XU (qflq2004@163.com6)