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Distillation Protocols that Involve Local Distinguishing: Composing Upper and Lower Bounds on Locally Accessible Information

机译:涉及局部区分的蒸馏方案:组成   本地可访问信息的上限和下限

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摘要

We find a universal lower bound on locally accessible information forarbitrary bipartite quantum ensembles, when one of the parties istwo-dimensional. In higher dimensions and in higher number of parties, thelower bound is on accessible information by separable operations. We show thatfor any given density matrix (of arbitrary number of parties and dimensions),there exists an ensemble, the ''Scrooge ensemble'', which averages to the givendensity matrix and whose locally accessible information saturates the lowerbound. Moreover, we use this lower bound along with a previously obtained upperbound to obtain bounds on the yield of singlets in distillation protocols thatinvolve local distinguishing.
机译:当一方为二维时,我们发现了任意二分量子系统的局部可访问信息的普遍下界。在更高的维度和更多的参与方中,下界是通过可分离的操作获得的信息。我们表明,对于任何给定的密度矩阵(任意数量的参与方和维度),都存在一个集合,即“ Scrooge集合”,该集合平均为给定的密度矩阵,并且其本地可访问信息饱和了下界。此外,我们使用此下限和先前获得的上限来获得涉及局部区分的蒸馏方案中单峰产率的界限。

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