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Enhancing nonlocal advantage of quantum coherence in correlated quantum channels
Quantum Information Processing ( IF 2.5 ) Pub Date : 2020-10-07 , DOI: 10.1007/s11128-020-02870-8
Yu-Xia Xie , Zhi-Yong Qin

We explore decay behaviors of the nonlocal advantage of quantum coherence (NAQC) for two qubits traversing the phase flap, bit flip, bit-phase flip, and depolarizing channels. For the input Bell and Bell-diagonal states, we showed analytically that the NAQC of the output states can always be noticeably enhanced due to the correlations between consecutive uses of these quantum channels, and the degree of minimum correlation needed for achieving the NAQC increases with an increase in the decoherence factor. We also explored a colored dephasing channel which enables one to compare the cooperation mechanism of two different origins of memory effects in enhancing the NAQC.



中文翻译:

增强相关量子通道中量子相干性的非局部优势

我们探索了量子相干(NAQC)的非局部优势的衰减行为,这些量子行为遍历了相位襟翼,位翻转,位相翻转和去极化通道的两个量子位。对于输入的贝尔和贝尔对角线状态,我们通过分析表明,由于这些量子通道的连续使用之间的相关性,输出状态的NAQC始终可以得到显着提高,而获得NAQC所需的最小相关度随退相干因子的增加。我们还探索了一种彩色相移通道,该通道使人们能够比较两种不同记忆效应来源在增强NAQC中的协同作用机制。

更新日期:2020-10-07
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