Local hypothesis testing between a pure bipartite state and the white noise state

Details Local hypothesis testing between a pure bipartite state and the white noise state Local hypothesis testing between a pure bipartite state and the white noise state

2010-06-14

arxiv.org/abs/1006.2744v1

Physics

Quantum Physics

18 pages, 4 figures

Scientific paper

In this paper, we treat a local discrimination problem in the framework of asymmetric hypothesis testing. We choose a known bipartite pure state $\ket{\Psi}$ as an alternative hypothesis, and the completely mixed state as a null hypothesis. As a result, we analytically derive an optimal type 2 error and an optimal POVM for one-way LOCC POVM and Separable POVM. For two-way LOCC POVM, we study a family of simple three-step LOCC protocols, and show that the best protocol in this family has strictly better performance than any one-way LOCC protocol in all the cases where there may exist difference between two-way LOCC POVM and one-way LOCC POVM.

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