Physics – Quantum Physics
Scientific paper
2005-02-25
Phys. Rev. A 72, 022342 (2005)
Physics
Quantum Physics
10 pages
Scientific paper
10.1103/PhysRevA.72.022342
Recently the problem of Unambiguous State Discrimination (USD) of mixed quantum states has attracted much attention. So far, bounds on the optimum success probability have been derived [1]. For two mixed states they are given in terms of the fidelity. Here we give tighter bounds as well as necessary and sufficient conditions for two mixed states to reach these bounds. Moreover we construct the corresponding optimal measurement strategies. With this result, we provide analytical solutions for unambiguous discrimination of a class of generic mixed states. This goes beyond known results which are all reducible to some pure state case. Additionally, we show that examples exist where the bounds cannot be reached.
Lütkenhaus Norbert
Raynal Philippe
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