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@article{563467,
author = {Hillery, Mark and Ziman, Mário and Bužek, Vladimír},
article_number = {042311},
keywords = {quantum information},
language = {eng},
issn = {1094-1622},
journal = {Physical Review A},
title = {Improving performance of probabilistic programmable quantum processors},
url = {http://link.aps.org/abstract/PRA/v69/e042311},
volume = {69},
year = {2004}
}
TY - JOUR
ID - 563467
AU - Hillery, Mark - Ziman, Mário - Bužek, Vladimír
PY - 2004
TI - Improving performance of probabilistic programmable quantum processors
JF - Physical Review A
VL - 69
IS - 042311
SP - 1-8
EP - 1-8
SN - 10941622
KW - quantum information
UR - http://link.aps.org/abstract/PRA/v69/e042311
N2 - We present a systematic analysis of how one can improve performance of probabilistic programmable quantum processors. We generalize a simple Vidal-Masanes-Cirac processor that realizes U(1) rotations on a qubit with the phase of the rotation encoded in a state of the program register. We show how the probability of success of the probabilistic processor can be enhanced by using the processor in loops. In addition we show that the same strategy can be utilized for a probabilistic implementation of nonunitary transformations on qubits. In addition, we show that an arbitrary SU(2) transformation of qubits can be encoded in program state of a universal programmable probabilistic quantum processor. The probability of success of this processor can be enhanced by a systematic correction of errors via conditional loops. Finally, we show that all our results can be generalized also for qudits. In particular, we show how to implement SU(N) rotations of qudits via programmable quantum processor and how the performance of the processor can be enhanced when it is used in loops.
ER -
HILLERY, Mark, Mário ZIMAN a Vladimír BUŽEK. Improving performance of probabilistic programmable quantum processors. \textit{Physical Review A}. 2004, roč.~69, č.~042311, s.~1-8. ISSN~1094-1622.
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