All entangled states are useful for channel discrimination
arXiv:0901.2118 · doi:10.1103/PhysRevLett.102.250501
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.
5 pages, more similar to the published version