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arXiv 0905.2998quant-ph
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在量子理论中不相容的测量不能在任何其他定域理论中联合测量

Measurements incompatible in Quantum Theory cannot be measured jointly in any other local theory

Michael M. Wolf, David Perez-Garcia, Carlos Fernandez

摘要:

众所周知,联合可测的观测量不能导致违反任何贝尔不等式--与状态和在另一个地点选择的测量无关。在这封信中,我们证明了相反的情况:每一对不相容的量子观测量都能破坏贝尔不等式,因此在任何其他无信号理论中必须保持不相容。虽然在冯·诺依曼测量的情况下,在两个地点使用相同的可观测量就足够了,但一般的测量可能需要不同的选择。主要结果表明,对于任意维数的CHSH不等式提供了拉格朗日对偶的联合可测性的特征。这导致了一个简单的标准,联合测量超出了已知的量子位的情况。

英文摘要:

It is well known that jointly measurable observables cannot lead to a violation of any Bell inequality - independent of the state and the measurements chosen at the other site. In this letter we prove the converse: every pair of incompatible quantum observables enables the violation of a Bell inequality and therefore must remain incompatible within any other no-signaling theory. While in the case of von Neumann measurements it is sufficient to use the same pair of observables at both sites, general measurements can require different choices. The main result is obtained by showing that for arbitrary dimension the CHSH inequality provides the Lagrangian dual of the characterization of joint measurability. This leads to a simple criterion for joint measurability beyond the known qubit case.

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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