Physics – Quantum Physics
Scientific paper
2004-01-01
Phys. Rev. Lett. 93, 200403 (2004)
Physics
Quantum Physics
Some minor revisions
Scientific paper
10.1103/PhysRevLett.93.200403
Quantum mechanics forbids deterministic discrimination among non-orthogonal states. Nonetheless, the capability to distinguish nonorthogonal states unambiguously is an important primitive in quantum information processing. In this work, we experimentally implement generalized measurements in an optical system and demonstrate the first optimal unambiguous discrimination between three nonorthogonal states, with a success rate of 55%, to be compared with the 25% maximum achievable using projective measurements. Furthermore we present the first realization of unambiguous discrimination between a pure state and a nonorthogonal mixed state.
Bergou Janos A.
Mohseni Masoud
Steinberg Aephraim M.
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