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arXiv quant-ph/0412116quant-ph
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量子信息中的工具与互熵

Instruments and mutual entropies in quantum information

Alberto Barchielli, Giancarlo Lupieri

摘要:

一般的量子测量是用仪器来表示的。本文给出了仪器是接受量子态作为输入,产生概率和后验态作为输出的通道的数学形式化。然后,利用von Neumann代数上的互熵以及仪器和通道的识别,统一地得到了许多新旧信息不等式。这样的不平等涉及各种数量的特征表现的研究中的工具,特别是,这些不平等包括和推广著名的Holevo的界限。

英文摘要:

General quantum measurements are represented by instruments. In this paper the mathematical formalization is given of the idea that an instrument is a channel which accepts a quantum state as input and produces a probability and an a posteriori state as output. Then, by using mutual entropies on von Neumann algebras and the identification of instruments and channels, many old and new informational inequalities are obtained in a unified manner. Such inequalities involve various quantities which characterize the performances of the instrument under study; in particular, these inequalities include and generalize the famous Holevo's bound.

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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