Accessible Information Without Disturbing Partially Known Quantum States on a von Neumann Algebra

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)

抄録

This paper addresses the problem of how much information we can extract without disturbing a statistical experiment, which is a family of partially known normal states on a von Neumann algebra. We define the classical part of a statistical experiment as the restriction of the equivalent minimal sufficient statistical experiment to the center of the outcome space, which, in the case of density operators on a Hilbert space, corresponds to the classical probability distributions appearing in the maximal decomposition by Koashi and Imoto (Phys. Rev. A 66, 022,318 2002). We show that we can access by a Schwarz or completely positive channel at most the classical part of a statistical experiment if we do not disturb the states. We apply this result to the broadcasting problem of a statistical experiment. We also show that the classical part of the direct product of statistical experiments is the direct product of the classical parts of the statistical experiments. The proof of the latter result is based on the theorem that the direct product of minimal sufficient statistical experiments is also minimal sufficient.

本文言語英語
ページ(範囲)2249-2266
ページ数18
ジャーナルInternational Journal of Theoretical Physics
57
8
DOI
出版ステータス出版済み - 8 1 2018
外部発表はい

All Science Journal Classification (ASJC) codes

  • 数学 (全般)
  • 物理学および天文学(その他)

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