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arXiv 1509.04869quant-ph
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关于弱测量的三个结果

Three results on weak measurements

N. D. Hari Dass

摘要:

给出了三个关于弱测量的最新结果。它们是:i)在单个拷贝上的重复测量不能提供关于它的任何信息,并且进一步地,在非常大的这种测量的限制下,弱测量具有与强测量完全相同的特征,ii)弱测量的表观非侵入性是\emph{illusory},并且即使在建立Leggett-Garg不等式的特定上下文中,它们也不比强测量更有利,当错误被适当地考虑,和,最后,iii)弱值测量是最佳的,在精确的意义上的伍特斯和字段,当后选择的状态是相互无偏的相对于本征态的观察,其弱值被测量。引入并阐述了状态空间弱值坐标的概念。

英文摘要:

Three recent results on weak measurements are presented. They are: i) repeated measurements on a single copy can not provide any information on it and further, that in the limit of very large such measurements, weak measurements have exactly the same characterstics as strong measurements, ii) the apparent non-invasiveness of weak measurements is \emph{illusory} and they are no more advantageous than strong measurements even in the specific context of establishing Leggett-Garg inequalities, when errors are properly taken into account, and, finally, iii) weak value measurements are optimal, in the precise sense of Wootters and Fields, when the post-selected states are mutually unbiased with respect to the eigenstates of the observable whose weak values are being measured. Notion of weak value coordinates for state spaces are introduced and elaborated.

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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