Discrimination of quantum observables using limited resources

Details Discrimination of quantum observables using limited resources Discrimination of quantum observables using limited resources

2007-12-21

arxiv.org/abs/0712.3675v2

Phys. Rev. A 77, 042321 (2008)

Physics

Quantum Physics

8 pages, no figures

Scientific paper

10.1103/PhysRevA.77.042321

We address the problem of unambiguous discrimination and identification among quantum observables. We set a general framework and investigate in details the case of qubit observables. In particular, we show that perfect discrimination with two shots is possible only for sharp qubit observables (e.g. Stern-Gerlach apparatuses) associated with mutually orthogonal directions. We also show that for sharp qubit observables associated to nonorthogonal directions unambiguous discrimination with an inconclusive result is always possible.

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