Unambiguous comparison of unitary channels

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Authors

ZIMAN Mário SEDLÁK Michal

Year of publication 2009
Type Article in Periodical
Magazine / Source Physical Review A
MU Faculty or unit

Faculty of Informatics

Citation
Web http://arxiv.org/abs/0809.4401
Field Informatics
Keywords Quantum information processing; unitary channels
Description 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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