All entangled states are useful for channel discrimination

Piani, Marco and Watrous, John (2009) All entangled states are useful for channel discrimination. Physical Review Letters, 102 (25). ISSN 0031-9007

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Abstract

We prove that every entangled state is useful as a resource for the problem of minimum-error channel discrimination. More specifically, given a single copy of an arbitrary bipartite entangled state, it holds that there is an instance of a quantum channel discrimination task for which this state allows for a correct discrimination with strictly higher probability than every separable state.