Minimum-error discrimination between three mirror-symmetric states

Anna Erika Elisabeth Andersson, Stephen M Barnett, Claire R Gilson, Kieran Hunter

Research output: Contribution to journalArticlepeer-review

97 Citations (Scopus)


We present the optimal measurement strategy for distinguishing between three quantum states exhibiting a mirror symmetry. The three states live in a two-dimensional Hilbert space, and are thus overcomplete. By mirror symmetry, we understand that the transformation {\+>-->\+>,\->-->-\->} leaves the set of states invariant. The obtained measurement strategy minimizes the error probability. An experimental realization for polarized photons, realizable with current technology, is suggested.

Original languageEnglish
Article number052308
Number of pages4
JournalPhysical Review A
Issue number5
Publication statusPublished - May 2002


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