Unambiguous discrimination among quantum operations

Details Unambiguous discrimination among quantum operations Unambiguous discrimination among quantum operations

2005-12-18

arxiv.org/abs/quant-ph/0512142v3

Phys. Rev. A 73, 042301(2006)

Physics

Quantum Physics

5 pages, no figure

Scientific paper

10.1103/PhysRevA.73.042301

We address the problem of unambiguous discrimination among a given set of quantum operations. The necessary and sufficient condition for them to be unambiguously distinguishable is derived in the cases of single use and multiple uses respectively. For the latter case we explicitly construct the input states and corresponding measurements that accomplish the task. It is found that the introduction of entanglement can improve the discrimination.

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