Detail publikačního výsledku

Probabilistic storage and retrieval of qubit phase gates

SEDLÁK, M.; ZIMAN, M.

Originální název

Probabilistic storage and retrieval of qubit phase gates

Anglický název

Probabilistic storage and retrieval of qubit phase gates

Druh

Článek WoS

Originální abstrakt

Probabilisticstorage and retrieval (PSR) of unitary quantum dynamics is possible withexponentially small failure probability with respect to the number of systemsused as a quantum memory [PRL 122, 170502 (2019)]. Here we study improvementsdue to a priori knowledge about the unitary transformation to be stored. Inparticular, we study N -> 1 PSR of qubit phase gates, i.e. qubitrotations a round Z axis with an unknown angle, and show that if we accessthe gate only N-times, the optimal probability of perfect retrieving of itssingle use is N/(N+1). We propose a quantum circuit realization for theoptimal protocol and show that programmable phase gate [PRL 88, 047905 (2002)]can be turned into (2^k-1)-> 1 optimal PSR of phase gates and requires only k CNOT gates, whilehaving exponentially small failure probability in k.

Anglický abstrakt

Probabilisticstorage and retrieval (PSR) of unitary quantum dynamics is possible withexponentially small failure probability with respect to the number of systemsused as a quantum memory [PRL 122, 170502 (2019)]. Here we study improvementsdue to a priori knowledge about the unitary transformation to be stored. Inparticular, we study N -> 1 PSR of qubit phase gates, i.e. qubitrotations a round Z axis with an unknown angle, and show that if we accessthe gate only N-times, the optimal probability of perfect retrieving of itssingle use is N/(N+1). We propose a quantum circuit realization for theoptimal protocol and show that programmable phase gate [PRL 88, 047905 (2002)]can be turned into (2^k-1)-> 1 optimal PSR of phase gates and requires only k CNOT gates, whilehaving exponentially small failure probability in k.

Klíčová slova

Probability, Quantum theory, Controlled-NOT gates, Failure Probability, Optimal Protocols, Priori Knowledge, Quantum Circuit, Quantum Dynamics, Storace  and Retrievals, Unitari Transformations

Klíčová slova v angličtině

Probability, Quantum theory, Controlled-NOT gates, Failure Probability, Optimal Protocols, Priori Knowledge, Quantum Circuit, Quantum Dynamics, Storace  and Retrievals, Unitari Transformations

Autoři

SEDLÁK, M.; ZIMAN, M.

Rok RIV

2021

Vydáno

17.09.2020

ISSN

2469-9926

Periodikum

PHYSICAL REVIEW A

Svazek

102

Číslo

1

Stát

Spojené státy americké

Strany od

1

Strany do

8

Strany počet

8

URL

https://journals.aps.org/pra/abstract/10.1103/PhysRevA.102.032618

BibTex

@article{BUT168542,
  author="Michal {Sedlák} and Mário {Ziman}",
  title="Probabilistic storage and retrieval of qubit phase gates",
  journal="PHYSICAL REVIEW A",
  year="2020",
  volume="102",
  number="1",
  pages="1--8",
  doi="10.1103/PhysRevA.102.032618",
  issn="2469-9926",
  url="https://journals.aps.org/pra/abstract/10.1103/PhysRevA.102.032618"
}

Dokumenty

PhysRevA.102.032618