Enhancement of thermal entanglement in two-qubit XY models

Enhancement of thermal entanglement in two-qubit XY models
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DOI:
10.1088/1464-4266/5/1/310
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发表时间:
2002-06
期刊:
Journal of Optics B-quantum and Semiclassical Optics
影响因子:
--
通讯作者:
C. Anteneodo;Andre M.C.Souza
C. Anteneodo;Andre M.C.Souza
中科院分区:
其他
文献类型:
--
作者:
C. Anteneodo;Andre M.C.Souza

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我们分析了两量子比特XY模型中导致热纠缠增强的条件。除了标准的XY交换相互作用,在外部磁场的存在下,包括叉积项的效果进行了研究。我们表明,纠缠可以产生在高温下通过调整外部磁场的方向。内在交换相互作用的细节决定了最佳取向。
We analyse conditions leading to enhancement of thermal entanglement in two-qubit XY models. The effect of including cross-product terms, besides the standard XY exchange interactions, in the presence of an external magnetic field, is investigated. We show that entanglement can be yielded at elevated temperatures by tuning the orientation of the external magnetic field. The details of the intrinsic exchange interactions determine the optimal orientation.