Optimal local discrimination of two multipartite pure states

Details Optimal local discrimination of two multipartite pure states Optimal local discrimination of two multipartite pure states

2001-02-14

arxiv.org/abs/quant-ph/0102073v2

Phys. Lett. A. 288, p.62 (2001)

Physics

Quantum Physics

Published version, results unchanged, although errors in the last proof have been corrected

Scientific paper

10.1016/S0375-9601(01)00484-4

In a recent paper, Walgate et. al. demonstrated that any two orthogonal multipartite pure states can be optimally distinguished using only local operations. We utilise their result to show that this is true for any two multiparty pure states, in the sense of inconclusive discrimination. There are also certain regimes of conclusive discrimination for which the same also applies, although we can only conjecture that the result is true for all conclusive regimes. We also discuss a class of states that can be distinguished locally according to any discrimination measure, as they can be locally recreated in the hands of one party. A consequence of this is that any two maximally entangled states can always be optimally discriminated locally, according to any figure of merit.

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