Informace o publikaci

Optimal Probabilistic Storage and Retrieval of Unitary Channels


SEDLÁK Michal BISIO Alessandro ZIMAN Mário

Rok publikování 2019
Druh Článek v odborném periodiku
Časopis / Zdroj Physical Review Letters
Fakulta / Pracoviště MU

Fakulta informatiky

Klíčová slova quantum learning; quantum networks
Popis We address the question of quantum memory storage for quantum dynamics. In particular, we design an optimal protocol for N -> 1 probabilistic storage and retrieval of unitary channels on d-dimensional quantum systems. If we access the unknown unitary gate only N times, the optimal success probability of perfect single-use retrieval is N /(N -1 + d(2)). The derived size of the memory system exponentially improves the known upper bound on the size of the program register needed for probabilistic programmable quantum processors. Our results are closely related to probabilistic perfect alignment of reference frames and probabilistic port-based teleportation.
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