Quantum state discrimination

Details Quantum state discrimination Quantum state discrimination

2008-10-10

arxiv.org/abs/0810.1970v1

Physics

Quantum Physics

43 pages, submitted to Advances in Optics and Photonics

Scientific paper

It is a fundamental consequence of the superposition principle for quantum states that there must exist non-orthogonal states, that is states that, although different, have a non-zero overlap. This finite overlap means that there is no way of determining with certainty in which of two such states a given physical system has been prepared. We review the various strategies that have been devised to discriminate optimally between non-orthogonal states and some of the optical experiments that have been performed to realise these.

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