Detail publikace

Probabilistic storage and retrieval of qubit phase gates

SEDLÁK, M. ZIMAN, M.

Originální název

Probabilistic storage and retrieval of qubit phase gates

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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 [PRL 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 a round 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 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, while having 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

Autoři

SEDLÁK, M.; ZIMAN, M.

Vydáno

17. 9. 2020

ISSN

2469-9926

Periodikum

Physical Review A

Ročník

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"
}