arXivDaily arXiv每日学术速递 周一至周五更新
arXiv quant-ph/9812062quant-ph

Accessible information and optimal strategies for real symmetrical quantum sources

Masahide Sasaki, Stephen M. Barnett, Richard Jozsa, Masao Osaki, Osamu Hirota

备注：
RevTeX, 16 pages, 4 eps figures with psfig, submitted to Phys. Rev. A, corrected output error of Fig. 1 in the previous version
发表信息：
Phys.Rev. A59 (2002) 3325
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

英文摘要：

We study the problem of optimizing the Shannon mutual information for sources of real quantum states i.e. sources for which there is a basis in which all the states have only real components. We consider in detail the sources ${\cal E}_M$ of $M$ equiprobable qubit states lying symmetrically around the great circle of real states on the Bloch sphere and give a variety of explicit optimal strategies. We also consider general real group-covariant sources for which the group acts irreducibly on the subset of all real states and prove the existence of a real group-covariant optimal strategy, extending a theorem of Davies (E. B. Davies, IEEE. Inf. Theory {\bf IT-24}, 596 (1978)). Finally we propose an optical scheme to implement our optimal strategies, enough simple to be realized with present technology.

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。

↑