Assisted Distillation of Quantum Coherence
Assisted Distillation of Quantum Coherence
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DOI：
10.1103/physrevlett.116.070402
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发表时间：
2016-02-17
影响因子：
8.6
通讯作者：
Lewenstein, M.
中科院分区：
文献类型：
--
作者：
Chitambar, E.;Streltsov, A.;Lewenstein, M.
我们介绍并研究了辅助相干蒸馏的任务。这项任务在双方系统中自然出现，双方共同努力在其中一个子系统上产生最大可能的一致性。目标系统上仅允许非相干操作，而另一系统上允许一般局部量子操作；这是一种操作范式，我们称之为局域量子非相干操作和经典通信。我们证明，纯态的辅助相干蒸馏的渐进率等于辅助相干性，这是辅助纠缠的类似物，我们描述了其属性。我们的发现意味着对冯诺依曼熵的新颖解释：它量化了系统在接受协作方的帮助时可以获得的最大额外量子相干性。我们的结果被推广到多方环境中的相干定位，并讨论了可能的应用。
We introduce and study the task of assisted coherence distillation. This task arises naturally in bipartite systems where both parties work together to generate the maximal possible coherence on one of the subsystems. Only incoherent operations are allowed on the target system, while general local quantum operations are permitted on the other; this is an operational paradigm that we call local quantum-incoherent operations and classical communication. We show that the asymptotic rate of assisted coherence distillation for pure states is equal to the coherence of assistance, an analog of the entanglement of assistance, whose properties we characterize. Our findings imply a novel interpretation of the von Neumann entropy: it quantifies the maximum amount of extra quantum coherence a system can gain when receiving assistance from a collaborative party. Our results are generalized to coherence localization in a multipartite setting and possible applications are discussed.