量子电子学报, 2012, 29 (2): 185, 网络出版: 2012-03-30
外磁场下两量子比特海森堡XXZ模型中量子关联和热纠缠的研究
Quantum correlations and thermal entanglement in a two-qubit Heisenberg XXZ model with external magnetic fields
量子光学 量子关联 热纠缠 海森堡XXZ模型 quantum optics quantum correlation thermal entanglement quantum discord quantum discord Heisenberg XXZ model
摘要
通过在两量子位上分别施加独立可控的外磁场(B+b)和(B－b), 以及改变耦合参数Jz、 磁场强度B、磁场不均匀度b和系统的温度kT, 探讨了两量子比特XXZ模型中量子关联的变化行为,并在相同参数下与热纠缠做了比较。 结果表明:量子关联存在的参数范围比热纠缠更广;而且在一定的参数范围内,量子关联和热纠缠的变化展示出不同的行为。
Abstract
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.
许琳, 夏云杰. 外磁场下两量子比特海森堡XXZ模型中量子关联和热纠缠的研究[J]. 量子电子学报, 2012, 29(2): 185. 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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