Conditional mutual information and quantum steering
Conditional mutual information and quantum steering
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DOI：
10.1103/physreva.96.022332
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发表时间：
2016-12
影响因子：
2.9
通讯作者：
Eneet Kaur;Xiaoting Wang;M. Wilde
中科院分区：
文献类型：
--
作者：
Eneet Kaur;Xiaoting Wang;M. Wilde
量子控制最近在控制资源理论的框架中得到了形式化，并且已经引入了几个量词。在这里，我们提出了一种用于转向的信息论量化器，称为内在可操纵性，它使用条件互信息来测量给定组合与具有局部隐藏状态模型的组合的偏差。因此，我们将条件互信息与量子控制联系起来，并引入满足某些所需属性的单调。量化器背后的想法是抑制可以用不可访问的量子系统解释的相关性，然后量化剩余的内在相关性。内在可操纵性的一种变体发现了操作意义，即将测量选择和结果发送给拥有正在测量的底层二分量子态的净化系统的窃听者的经典通信成本。
Quantum steering has recently been formalized in the framework of a resource theory of steering, and several quantifiers have already been introduced. Here, we propose an information-theoretic quantifier for steering called intrinsic steerability, which uses conditional mutual information to measure the deviation of a given assemblage from one having a local hidden-state model. We thus relate conditional mutual information to quantum steering and introduce monotones that satisfy certain desirable properties. The idea behind the quantifier is to suppress the correlations that can be explained by an inaccessible quantum system and then quantify the remaining intrinsic correlations. A variant of the intrinsic steerability finds operational meaning as the classical communication cost of sending the measurement choice and outcome to an eavesdropper who possesses a purifying system of the underlying bipartite quantum state that is being measured.