2020
Probabilistic storage and retrieval of qubit phase gates
SEDLÁK, Michal and Mário ZIMANBasic information
Original name
Probabilistic storage and retrieval of qubit phase gates
Authors
SEDLÁK, Michal and Mário ZIMAN
Edition
Physical Review A, 2020, 2469-9926
Other information
Language
English
Type of outcome
Article in a journal
Field of Study
10201 Computer sciences, information science, bioinformatics
Country of publisher
United States of America
Confidentiality degree
is not subject to a state or trade secret
References:
Impact factor
Impact factor: 3.140
Marked to be transferred to RIV
Yes
RIV identification code
RIV/00216224:14330/20:00118502
Organization unit
Faculty of Informatics
UT WoS
EID Scopus
Keywords (in Czech)
kvantové technologie; kvantová informace
Keywords in English
quantum technologies; quantum information
Tags
Tags
International impact, Reviewed
Changed: 14/6/2022 11:55, RNDr. Pavel Šmerk, Ph.D.
Abstract
In the original language
Probabilistic storage and retrieval (PSR) of unitary quantum dynamics is possible with exponentially small failure probability with respect to the number of systems used as a quantum memory [M. Sedlák, A. Bisio, and M. Ziman, Phys. Rev. Lett. 122, 170502 (2019)]. Here we study improvements due to a priori knowledge about the unitary transformation to be stored. In particular, we study N-->1 PSR of qubit phase gates, i.e., qubit rotations around the Z axis with an unknown angle, and show that if we access the gate only N times the optimal probability of perfect retrieving of its single use is N/(N+1). We propose a quantum circuit realization for the optimal protocol and show that a programmable phase gate [G. Vidal, L. Masanes, and J. I. Cirac, Phys. Rev. Lett. 88, 047905 (2002)] can be turned into a (2k-1)-->1 optimal PSR of phase gates and requires only k controlled-not gates, while having exponentially small failure probability in k.
Links
| MUNI/G/1211/2017, interní kód MU |
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