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arXiv 1401.4571quant-ph
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噪声信道下XXX海森堡自旋链的量子不协调和单范数几何量子不协调

Quantum discord and one-norm geometric quantum discord for XXX Heisenberg spin chain under noisy channels

E. Faizi, H. Eftekhari

摘要:

本文比较了XXX海森堡自旋链在退相干作用下的量子不协调、1-范数几何量子不协调和纠缠的行为。详细介绍了它们与温度和耦合常数的关系。通过比较可以看出,量子不协和1-范数几何量子不协比协同对退相干的鲁棒性更强,因为量子不协和1-范数几何量子不协取非零值并渐近减小,而协同在包括温度和耦合常数在内的很大参数范围内为零.此外,我们发现1-范数几何量子不协调和量子不协调之间不存在简单的相对序。这一结果与一些文献中提供的信息相矛盾。

英文摘要:

Here, we compare the behavior of the quantum discord, 1-norm geometric quantum discord and concurrence under the effect of decoherence for XXX Heisenberg spin chain. Their dependencies on temperature and coupling constant are presented in detail. By a comparison between them we can see that quantum discord and 1-norm geometric quantum discord are more robust than the concurrence against decoherence in the sense that quantum discord and 1-norm geometric quantum discord takes a nonzero value and decrease asymptotically, while the concurrence is zero in a large range of parameters including temperature and coupling constant. Moreover, we find that there is no simple relative ordering between 1-norm geometric quantum discord and quantum discord. This result contradicts the information which provided in some papers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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