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Of Local Operations and Physical Wires

机译：本地操作和物理电线

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In this work (multipartite) entanglement, discord, and coherence are unified as different aspects of a single underlying resource theory defined through simple and operationally meaningful elemental operations. This is achieved by revisiting the resource theory defining entanglement, local operations, and classical communication (LOCC), placing the focus on the underlying quantum nature of the communication channels. Taking the natural elemental operations in the resulting generalization of LOCC yields a resource theory that singles out coherence in the wire connecting the spatially separated systems as an operationally useful resource. The approach naturally allows us to consider a reduced setting as well, namely, the one with only the wire connected to a single quantum system, which leads to discordlike resources. The general form of free operations in this latter setting is derived and presented as a closed form. We discuss in what sense the present approach defines a resource theory of quantum discord and in which situations such an interpretation is sound—and why in general discord is not a resource. This unified and operationally meaningful approach makes transparent many features of entanglement that in LOCC might seem surprising, such as the possibility to use a particle to entangle two parties, without it ever being entangled with either of them, or that there exist different forms of multipartite entanglement.
机译：在这项工作中（多党）纠缠，不和谐和一致性被统一，作为通过简单和经营意义的元素操作所定义的单一底层资源理论的不同方面。这是通过重访定义纠缠，本地操作和经典通信（LOCC）的资源理论来实现的，将重点放在通信信道的底层量子特性上。在所得到的Locc的概括中采取天然元素操作产生了一种资源理论，其在连接空间分离系统中作为操作有用资源的电线单打连贯的资源理论。该方法自然允许我们考虑降低的设置，即，仅具有连接到单个量子系统的导线的那个，这导致不和谐资源。在后一种环境中的一般自由操作形式衍生和呈现为封闭形式。我们讨论了本方法定义了Quantum Discord的资源理论，并且在哪种情况下，这种解释是声音的 - 以及通常不和谐不是资源。这种统一和经营的有意义的方法使得诸多纠缠的功能似乎可能似乎令人惊讶，例如使用粒子纠缠双方的可能性，没有它与其中任何一个缠绕，或者存在不同形式的多鹦鹉纠缠。

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