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arXiv 1803.02426quant-ph
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Bell对角态的局域有效量子关联和马尔可夫退相干

Local available quantum correlations for Bell Diagonal states and markovian decoherence

Hermann Albrecht, Douglas Mundarain, Mario Caicedo

摘要:

局域可用量子关联(LAQC),由Mundarain等人定义。[19],解析确定贝尔对角态。利用Kraus算符形式[10],我们分析了马尔可夫退相干下2-量子比特LAQC的耗散动力学.这是在去极化[20]和相位阻尼通道[21]下对维尔纳状态进行的。由于Werner态是表现出所谓的纠缠猝死的状态之一[27],因此将结果与Werlang等人[24]分析的量子不和谐[22]以及纠缠(即并发)[7]的结果进行比较。LAQC量词仅渐近消失,如量子不一致的情况所示,尽管更低。

英文摘要:

Local available quantum correlations (LAQCs), as defined by Mundarain et al. [19], are analytically determined for Bell Diagonal states. Using the Kraus operators formalism [10], we analyze the dissipative dynamics of 2-qubit LAQCs under markovian decoherence. This is done for Werner states under the depolarizing [20] and phase damping channels [21]. Since Werner states are among those that exhibit the so called entanglement sudden death [27], the results are compared with the ones obtained for Quantum Discord [22], as analyzed by Werlang et al. [24], as well as for entanglement, i.e. Concurrence [7]. The LAQCs quantifier only vanishes asymptotically, as was shown to be the case for Quantum Discord, in spite of being lower.

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