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arXiv quant-ph/0608235quant-ph
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不引入辅助维数的正算子值测度的射影测度实现

Realization of positive-operator-valued measures by projective measurements without introducing ancillary dimensions

Guoming Wang, Mingsheng Ying

摘要:

我们提出了一个方案,可以实现一类正算子值的措施(POVM)通过执行一系列的投影测量的原始系统,在这个意义上说,对于任意输入状态的概率分布的测量结果是忠实地再现。一个必要和充分条件的POVM是可实现的,以这种方式也得到了。与Neumark定理所提供的规范方法相比,我们的方法具有不需要辅助系统的优点。此外,一个任意的POVM可以实现通过利用我们的协议在一个扩展的空间,这是通过添加只有一个额外的维形成。

英文摘要:

We propose a scheme that can realize a class of positive-operator-valued measures (POVMs) by performing a sequence of projective measurements on the original system, in the sense that for an arbitrary input state the probability distribution of the measurement outcomes is faithfully reproduced. A necessary and sufficient condition for a POVM to be realizable in this way is also derived. In contrast to the canonical approach provided by Neumark's theorem, our method has the advantage of requiring no auxiliary system. Moreover, an arbitrary POVM can be realized by utilizing our protocol on an extended space which is formed by adding only a single extra dimension.

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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