Optimally Conclusive Discrimination of Non-orthogonal Entangled States Locally

Details Optimally Conclusive Discrimination of Non-orthogonal Entangled States Locally Optimally Conclusive Discrimination of Non-orthogonal Entangled States Locally

2001-04-13

arxiv.org/abs/quant-ph/0104068v2

Physics

Quantum Physics

4 pages, no figure, revtex. few typos corrected

Scientific paper

We consider one copy of a quantum system prepared with equal prior probability in one of two non-orthogonal entangled states of multipartite distributed among separated parties. We demonstrate that these two states can be optimally distinguished in the sense of conclusive discrimination by local operations and classical communications(LOCC) alone. And this proves strictly the conjecture that Virmani et.al. [8] confirmed numerically and analytically. Generally, the optimal protocol requires local POVM operations which are explicitly constructed. The result manifests that the distinguishable information is obtained only and completely at the last operation and all prior ones give no information about that state.

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