Discriminating states: The quantum Chernoff bound

K. M.R. Audenaert, J. Calsamiglia, R. Muñoz-Tapia, E. Bagan, Ll Masanes, A. Acin, F. Verstraete

Research output: Contribution to journalArticleResearchpeer-review

318 Citations (Scopus)


We consider the problem of discriminating two different quantum states in the setting of asymptotically many copies, and determine the minimal probability of error. This leads to the identification of the quantum Chernoff bound, thereby solving a long-standing open problem. The bound reduces to the classical Chernoff bound when the quantum states under consideration commute. The quantum Chernoff bound is the natural symmetric distance measure between quantum states because of its clear operational meaning and because it does not seem to share some of the undesirable features of other distance measures. © 2007 The American Physical Society.
Original languageEnglish
Article number160501
JournalPhysical Review Letters
Publication statusPublished - 17 Apr 2007


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