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arXiv quant-ph/0206018quant-ph
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两量子比特XY模型中热纠缠的增强

Enhancement of thermal entanglement in two-qubit XY models

Celia Anteneodo, Andre M. C. Souza

摘要:

我们分析了两量子比特XY模型中导致热纠缠增强的条件。研究了在外加磁场作用下,除了标准XY交换相互作用外,还加入叉积项的影响。我们发现,在高温下,可以通过调整外部磁场的方向产生纠缠。内在交换相互作用的细节决定了最佳取向。

英文摘要:

We analyze 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 yield at elevated temperatures by tuning the orientation of the external magnetic field. The details of the intrinsic exchange interactions determine the optimal orientation.

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