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arXiv 0705.0181quant-ph
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单个量子比特是否存在上下文关系?

Is there contextuality for a single qubit?

Andrzej Grudka, Pawel Kurzynski

摘要:

它是由Cabello和Nakamura [A. Cabello,Phys. Rev. Lett. 90,190401(2003)],Kochen-Specker定理适用于两个维度,如果使用正算子值测度。我们表明,在他们的模型中的语境是不是Kochen-Specker类型。而是没有跟踪执行测量的整个系统的结果。这与POVM元素和扩展希尔伯特空间上的投影仪之间没有一一对应的事实有关,并且当在Cabello和Nakamura的模型中使用时,相同的POVM元素必须源自两个不同的投影仪。此外,我们提出了上述模型的隐变量公式。

英文摘要:

It was presented by Cabello and Nakamura [A. Cabello, Phys. Rev. Lett. 90, 190401 (2003)], that the Kochen-Specker theorem applies to two dimensions if one uses Positive Operator-Valued Measures. We show that contextuality in their models is not of the Kochen-Specker type. It is rather the result of not keeping track of the whole system on which the measurement is performed. This is connected to the fact that there is no one-to-one correspondence between POVM elements and projectors on the extended Hilbert space and the same POVM element has to originate from two different projectors when used in Cabello's and Nakamura's models. Moreover, we propose a hidden-variable formulation of the above models.

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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