Remote state preparation using correlations beyond discord
Remote state preparation using correlations beyond discord
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DOI：
10.1103/physreva.98.062320
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发表时间：
2018-12-17
影响因子：
2.9
通讯作者：
Home, Dipankar
中科院分区：
文献类型：
--
作者：
Kanjilal, Som;Khan, Aiman;Home, Dipankar
近年来，探索利用可分离态作为资源来实现量子信息处理（QIP）任务的可能性越来越有意义。在这种情况下，一个特别重要的证明是，不消失的不和谐是可分离状态被用作远程准备任意纯目标状态的资源的必要条件[Nat. Phys. 8,666(2012)]。本工作源于我们的观察，不仅具有相同不和谐的资源状态意味着远程状态准备（RSP）协议的不同效率（就平均保真度而言），而且具有较高不和谐的状态可能意味着较低的RSP效率。因此，这需要确定量子相关性的相关特征，这些特征可以适当地量化RSP协议的资源状态的有效性。为此，对于双量子位钟对角线态，我们证明了在三个相互无偏的碱基中适当的同时相关性度量可以用来量化资源对RSP任务的有用性，使用纠缠状态和可分离状态，包括作为资源的非不协调状态。特别地，揭示了具有这种非消失度量的零不谐状态可以用于远程准备纯目标状态的子集。因此，这项工作表明，使用可分离状态，QIP任务（如RSP）的有效资源可以通过在相互无偏的基础上的同时相关性提供。
In recent years, exploration of the possible use of separable states as a resource to achieve quantum information processing (QIP) tasks has been gaining increasing significance. In this context, a particularly important demonstration has been that nonvanishing discord is the necessary condition for separable states to be used as a resource for remotely preparing any arbitrary pure target state [Nat. Phys. 8, 666 (2012)]. The present work stems from our observation that not only can resource states with the same discord imply different efficiencies (in terms of average fidelity) of the remote state preparation (RSP) protocol, but also states with higher discord can imply lower RSP efficiency. Therefore, this necessitates identification of the relevant feature of quantum correlations that can appropriately quantify the effectiveness of the resource state for the RSP protocol. To this end, for the two-qubit Bell-diagonal states, we show that an appropriate measure of simultaneous correlations in three mutually unbiased bases can serve to quantify the usefulness of the resource for the RSP task using entangled as well as separable states, including nondiscordant states as a resource. In particular, it is revealed that zero-discord states with such a nonvanishing measure can be useful for remotely preparing a subset of pure target states. Thus, this work shows that, using separable states, an effective resource for QIP tasks such as RSP can be provided by simultaneous correlations in mutually unbiased bases.