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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 and Michal SEDLÁK. Unambiguous comparison of unitary channels. \textit{Physical Review A}. 2009, vol.~79, No~1, p.~012303-1;012303-7, 7 pp. ISSN~1050-2947.
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