Quantum Hypothesis Testing and the Operational Interpretation of the Quantum Rényi Relative Entropies

Milán Mosonyi, Tomohiro Ogawa

    Research output: Contribution to journalArticleResearchpeer-review

    73 Citations (Scopus)

    Abstract

    © 2014, Springer-Verlag Berlin Heidelberg. We show that the new quantum extension of Rényi’s α-relative entropies, introduced recently by Müller-Lennert et al. (J Math Phys 54:122203, 2013) and Wilde et al. (Commun Math Phys 331(2):593–622, 2014), have an operational interpretation in the strong converse problem of quantum hypothesis testing. Together with related results for the direct part of quantum hypothesis testing, known as the quantum Hoeffding bound, our result suggests that the operationally relevant definition of the quantum Rényi relative entropies depends on the parameter α: for α < 1, the right choice seems to be the traditional definition (Formula presented.), whereas for α > 1 the right choice is the newly introduced version (Formula presented.). On the way to proving our main result, we show that the new Rényi α-relative entropies are asymptotically attainable by measurements for α > 1. From this, we obtain a new simple proof for their monotonicity under completely positive trace-preserving maps.
    Original languageEnglish
    Pages (from-to)1617-1648
    JournalCommunications in Mathematical Physics
    Volume334
    Issue number3
    DOIs
    Publication statusPublished - 1 Jan 2014

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