Thermal entanglement in the two-qubit Heisenberg XY model under a nonuniform external magnetic field
Thermal entanglement in the two-qubit Heisenberg XY model under a nonuniform external magnetic field
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DOI：
10.1103/physreva.68.044301
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发表时间：
2003-10
影响因子：
2.9
通讯作者：
Yang Sun;Yuguang Chen;Hong Chen
中科院分区：
文献类型：
--
作者：
Yang Sun;Yuguang Chen;Hong Chen
研究了非均匀磁场作用下两量子比特海森堡XY模型中的热纠缠。计算了纠缠度的度量--并发度。竞合行为存在于三种不同的情形中。与均匀磁场的情况相反，我们发现在非均匀磁场下，纠缠度和临界温度T{sub C}可能会增强。
We investigate the thermal entanglement in the two-qubit Heisenberg XY model with a nonuniform magnetic field. Concurrence, the measurement of entanglement, is calculated. The behavior of concurrence is present at three different cases. Contrary to the uniform magnetic field case, we find that the entanglement and the critical temperature T{sub C} may be enhanced under a nonuniform magnetic field.