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arXiv 0708.3154quant-ph
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双向经典通信显著提高了本地可扩展性

Two-way classical communication remarkably improves local distinguishability

Masaki Owari, Masahito Hayashi

摘要:

我们分析了以下三个限制之间的本地可扩展性的差异:(i)本地操作和仅允许单向经典通信(单向LOCC)。(ii)允许本地操作和双向经典通信(双向LOCC)。(iii)允许所有可分离的操作。我们得到了两个主要的结果之间的区别给定的二分纯态和完全混合态的条件下,给定的状态应该是完美的检测。作为第一个结果,我们推导出了在(i)和(iii)两种情况下的二体纯态的最优鉴别协议。作为第二个结果,通过构造一个具体的双向局部鉴别协议,证明了情况(ii)比情况(i)好得多,即,至少对于低维的二体纯态,双向经典通信与单向经典通信相比显著地改善了局域可分辨性。

英文摘要:

We analyze the difference in the local distinguishability among the following three restrictions; (i) Local operations and only one-way classical communications (one-way LOCC) are permitted. (ii) Local operations and two-way classical communications (two-way LOCC) are permitted. (iii) All separable operations are permitted. We obtain two main results concerning the discrimination between a given bipartite pure state and the completely mixed state with the condition that the given state should be detected perfectly. As the first result, we derive the optimal discrimination protocol for a bipartite pure state in the cases (i) and (iii). As the second result, by constructing a concrete two-way local discrimination protocol, it is proven that the case (ii) is much better than the case (i), i.e., two-way classical communication remarkably improves the local distinguishability in comparison with one-way classical communication at least for a low-dimensional bipartite pure state.

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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