论文标题

了解纠缠与非局部性的相互作用:激励和发展纠缠理论的新分支

Understanding the interplay of entanglement and nonlocality: motivating and developing a new branch of entanglement theory

论文作者

Schmid, David, Fraser, Thomas C., Kunjwal, Ravi, Sainz, Ana Belen, Wolfe, Elie, Spekkens, Robert W.

论文摘要

量化资源的一种标准方法是确定哪些资源上的运营是免费的,并根据自由操作下可兑换性的关系而推导的部分订单。如果感兴趣的资源是体现在量子状态的相关性的非古老性,即纠缠,那么常见的假设是,适当的自由操作选择是本地操作和经典交流(LOCC)。我们在这里主张研究不同选择的自由操作,即本地操作和共享随机性(LOSR),并证明了其在理解状态纠缠与贝尔实验中相关性的非局部性之间相互作用方面的效用。具体而言,我们表明,LOSR范式(i)提供了一种解决非局部性异常的解决方案,其中部分纠缠的状态比最大纠缠的状态表现出更多的非局部性,(ii)具有真正的多方纠缠性和非局限性的新概念,这些概述是自由的,这是一种自由的自由概念,并且可以使(iiiii and)成为可能的(iii ii ii and),并且(iii ii ii ii ii II)可能会产生(iiiii II)的病理特征。概括并简化先前结果的状态。在此过程中,我们得出了一些基本结果,这些结果涉及在LOSR下纯粹的纠缠状态之间可转换的必要条件,并突出了它们的某些后果,例如对双分部分纯状态的催化不可能。资源理论的观点也阐明了为什么有混合的纠缠状态既不违反任何贝尔不平等,也不令人惊讶。我们的结果激发了将LOSR键入作为纠缠理论的新分支的研究。

A standard approach to quantifying resources is to determine which operations on the resources are freely available, and to deduce the partial order over resources that is induced by the relation of convertibility under the free operations. If the resource of interest is the nonclassicality of the correlations embodied in a quantum state, i.e., entanglement, then the common assumption is that the appropriate choice of free operations is Local Operations and Classical Communication (LOCC). We here advocate for the study of a different choice of free operations, namely, Local Operations and Shared Randomness (LOSR), and demonstrate its utility in understanding the interplay between the entanglement of states and the nonlocality of the correlations in Bell experiments. Specifically, we show that the LOSR paradigm (i) provides a resolution of the anomalies of nonlocality, wherein partially entangled states exhibit more nonlocality than maximally entangled states, (ii) entails new notions of genuine multipartite entanglement and nonlocality that are free of the pathological features of the conventional notions, and (iii) makes possible a resource-theoretic account of the self-testing of entangled states which generalizes and simplifies prior results. Along the way, we derive some fundamental results concerning the necessary and sufficient conditions for convertibility between pure entangled states under LOSR and highlight some of their consequences, such as the impossibility of catalysis for bipartite pure states. The resource-theoretic perspective also clarifies why it is neither surprising nor problematic that there are mixed entangled states which do not violate any Bell inequality. Our results motivate the study of LOSR-entanglement as a new branch of entanglement theory.

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