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arXiv quant-ph/0202034quant-ph
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非定域性、非对称性和可区分的二分态

Nonlocality, Asymmetry, and Distinguishing Bipartite States

Jonathan Walgate, Lucien Hardy

摘要:

纠缠是一种有用的资源,因为一些全局操作不能使用经典通信在本地实现。我们证明了一些结果是什么,是不是本地可能的。我们专注于正交状态,它总是可以在全球范围内区分。我们建立了一个一般的2 × 2量子态的局部可区分的必要和充分条件,以及一个一般的2 × n量子态的局部可区分的必要和充分条件。这些结果揭示了非定域性的基本不对称性,这是“无纠缠非定域性”的起源,我们提出了一个非常简单的证明这一现象。

英文摘要:

Entanglement is an useful resource because some global operations cannot be locally implemented using classical communication. We prove a number of results about what is and is not locally possible. We focus on orthogonal states, which can always be globally distinguished. We establish the necessary and sufficient conditions for a general set of 2x2 quantum states to be locally distinguishable, and for a general set of 2xn quantum states to be distinguished given an initial measurement of the qubit. These results reveal a fundamental asymmetry to nonlocality, which is the origin of ``nonlocality without entanglement'', and we present a very simple proof of this phenomenon.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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