论文标题

凸量子资源理论的多目标操作任务

Multi-object operational tasks for convex quantum resource theories

论文作者

Ducuara, Andrés F., Lipka-Bartosik, Patryk, Skrzypczyk, Paul

论文摘要

量子资源理论框架内的普遍作案操作是表征和利用单个对象中的资源,我们可以称为\ emph {single-object}量子资源理论。但是,人们可能会怀疑,现在是否可以同时利用多种不同类型的对象中包含的资源,即现在以\ emph {Multi-object}量子资源理论为单位。在这项工作中,我们以亚通道歧视和亚渠道排除游戏的形式介绍了此类多对象操作任务的示例,其中玩家利用了州测量对中所含的资源。我们证明,对于任何一个国家足智多谋的州测量对,存在歧视和排除游戏,这样的一对胜过任何可能的免费状态测量对。这些结果适用于各州的任意凸资源,以及任意凸的凸资源,用于对经典后处理是免费操作的测量资源。 Furthermore, we prove that the advantage in these multi-object operational tasks is determined, in a multiplicative manner, by the resource quantifiers of: \emph{generalised robustness of resource} of both state and measurement for discrimination games and \emph{weight of resource} of both state and measurement for exclusion games.

The prevalent modus operandi within the framework of quantum resource theories has been to characterise and harness the resources within single objects, in what we can call \emph{single-object} quantum resource theories. One can wonder however, whether the resources contained within multiple different types of objects, now in a \emph{multi-object} quantum resource theory, can simultaneously be exploited for the benefit of an operational task. In this work, we introduce examples of such multi-object operational tasks in the form of subchannel discrimination and subchannel exclusion games, in which the player harnesses the resources contained within a state-measurement pair. We prove that for any state-measurement pair in which either of them is resourceful, there exist discrimination and exclusion games for which such a pair outperforms any possible free state-measurement pair. These results hold for arbitrary convex resources of states, and arbitrary convex resources of measurements for which classical post-processing is a free operation. Furthermore, we prove that the advantage in these multi-object operational tasks is determined, in a multiplicative manner, by the resource quantifiers of: \emph{generalised robustness of resource} of both state and measurement for discrimination games and \emph{weight of resource} of both state and measurement for exclusion games.

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