Unambiguous comparison of unitary channels

Details Unambiguous comparison of unitary channels Unambiguous comparison of unitary channels

2008-09-25

arxiv.org/abs/0809.4401v2

Phys. Rev. A 79, 012303 (2009)

Physics

Quantum Physics

Version published in PRA, 7 pages, 1 figure

Scientific paper

10.1103/PhysRevA.79.012303

We address the problem of unambiguous comparison of a pair of unknown qudit unitary channels. Using the framework of process positive operator valued measures (PPOVM) we characterize all solutions and identify the optimal ones. We prove that the entanglement is the key ingredient in designing the optimal experiment for comparison of unitary channels. Without entanglement the optimality can not be achieved. The proposed scheme is also experimentally feasible.

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