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@article{832676, author = {Ziman, Mário and Sedlák, Michal}, article_number = {1}, keywords = {Quantum information processing; unitary channels}, language = {eng}, issn = {1050-2947}, journal = {Physical Review A}, title = {Unambiguous comparison of unitary channels}, url = {http://arxiv.org/abs/0809.4401}, volume = {79}, year = {2009} }
TY - JOUR ID - 832676 AU - Ziman, Mário - Sedlák, Michal PY - 2009 TI - Unambiguous comparison of unitary channels JF - Physical Review A VL - 79 IS - 1 SP - 012303-1;012303-7 EP - 012303-1;012303-7 SN - 10502947 KW - Quantum information processing KW - unitary channels UR - http://arxiv.org/abs/0809.4401 N2 - 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. ER -
ZIMAN, Mário a Michal SEDLÁK. Unambiguous comparison of unitary channels. \textit{Physical Review A}. 2009, roč.~79, č.~1, s.~012303-1;012303-7, 7 s. ISSN~1050-2947.
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