论文标题
语境性作为量子纠缠的前提
Contextuality as a Precondition for Quantum Entanglement
论文作者
论文摘要
量子理论具有几种现象，可以将其视为信息处理任务的资源。这些效应中的一些，例如纠缠，是在非局部情况下出现的，其中量子状态分布在不同的各方之间。如果制备量子状态然后进行测量序列，则可以观察其他现象，例如上下文性。我们使用健壮的远程状态准备来连接非本地和顺序场景，并在不同资源之间提供亲密的联系：我们证明，只有在相应的顺序场景中的准备和测量上下文中，并且范围内的缺乏，才能在非本地场景中纠缠不变。直接的结果，我们的结果使我们能够将测试准备和测量情境的任何不平等转化为纠缠测试；此外，纠缠证人可用于设计新颖的情境不平等。
Quantum theory features several phenomena which can be considered as resources for information processing tasks. Some of these effects, such as entanglement, arise in a nonlocal scenario, where a quantum state is distributed between different parties. Other phenomena, such as contextuality, can be observed if quantum states are prepared and then subjected to sequences of measurements. We use robust remote state preparation to connect the nonlocal and sequential scenarios and provide an intimate connection between different resources: We prove that entanglement in a nonlocal scenario can arise only if there is preparation and measurement contextuality in the corresponding sequential scenario and that the absence of entanglement implies the absence of contextuality. As a direct consequence, our result allows us to translate any inequality for testing preparation and measurement contextuality into an entanglement test; in addition, entanglement witnesses can be used to design novel contextuality inequalities.
