Strathprints Home | Open Access | Browse | Search | User area | Copyright | Help | Library Home | SUPrimo

Accessible information and optimal strategies for real symmetrical quantum sources

Sasaki, Masahide and Barnett, Stephen M. and Jozsa, Richard and Osaki, Masao and Hirota, Osamu (1999) Accessible information and optimal strategies for real symmetrical quantum sources. Physical Review A, 59 (5). pp. 3325-3335. ISSN 1050-2947

[img]
Preview
PDF (strathprints005860.pdf)
Download (257Kb) | Preview

    Abstract

    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 of the states have only real components. We consider in detail the sources EM of M equiprobable quantum bit (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 IT-24, 596 (1978)]. Finally, we propose an optical scheme to implement our optimal strategies, simple enough to be realized with present technology.

    Item type: Article
    ID code: 5860
    Keywords: quantum states, qubit, optimal strategies, optics, optical physics, Optics. Light
    Subjects: Science > Physics > Optics. Light
    Department: Faculty of Science > Physics
    Related URLs:
    Depositing user: Miss Darcy Spiller
    Date Deposited: 30 Apr 2008
    Last modified: 17 Dec 2013 08:28
    URI: http://strathprints.strath.ac.uk/id/eprint/5860

    Actions (login required)

    View Item

    Fulltext Downloads: