论文标题

多部分场景中的信息因果关系

Information causality in multipartite scenarios

论文作者

Pollyceno, Lucas, Chaves, Rafael, Rabelo, Rafael

论文摘要

贝尔非局部性是量子系统显示的最有趣,最违反直觉的现象之一。有趣的是,这种比量子理论基础的重要问题是这种限制的强度,这是一种重要的量子相关性。一个候选人是信息因果原则,在某些特定情况下,该原则被证明是量子系统所持有的,并且被量化的相关性强。但是,在多部分的情况下,众所周知,信息因果原理的原始表述甚至无法检测到极端强度的相关性,因此表明确实需要对原理进行真正的多部分表述。在这项工作中,我们朝着这一目标迈进,报告了多部分场景中信息因果原理的新表述。通过提出改变观点的改变,我们获得了多方信息不平等,这些不平等是必要的标准来持有的原则。我们证明,这种不平等对所有量子资源都存在,并禁止一些比量子更强的资源。最后,我们表明,如果有多个资源可用,或者,如果采用嘈杂的沟通渠道,则可以加强我们的方法。

Bell nonlocality is one of the most intriguing and counter-intuitive phenomena displayed by quantum systems. Interestingly, such stronger-than-classical quantum correlations are somehow constrained, and one important question to the foundations of quantum theory is whether there is a physical, operational principle responsible for those constraints. One candidate is the information causality principle, which, in some particular cases, is proven to hold for quantum systems and to be violated by stronger-than-quantum correlations. In multipartite scenarios, though, it is known that the original formulation of the information causality principle fails to detect even extremal stronger-than-quantum correlations, thus suggesting that a genuinely multipartite formulation of the principle is necessary. In this work, we advance towards this goal, reporting a new formulation of the information causality principle in multipartite scenarios. By proposing a change of perspective, we obtain multipartite informational inequalities that work as necessary criteria for the principle to hold. We prove that such inequalities hold for all quantum resources, and forbid some stronger-than-quantum ones. Finally, we show that our approach can be strengthened if multiple copies of the resource are available, or, counter-intuitively, if noisy communication channels are employed.

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