Quantum Error Correction Decoheres Noise.

Published

Journal Article

Typical studies of quantum error correction assume probabilistic Pauli noise, largely because it is relatively easy to analyze and simulate. Consequently, the effective logical noise due to physically realistic coherent errors is relatively unknown. Here, we prove that encoding a system in a stabilizer code and measuring error syndromes decoheres errors, that is, causes coherent errors to converge toward probabilistic Pauli errors, even when no recovery operations are applied. Two practical consequences are that the error rate in a logical circuit is well quantified by the average gate fidelity at the logical level and that essentially optimal recovery operators can be determined by independently optimizing the logical fidelity of the effective noise per syndrome.

Full Text

Duke Authors

Cited Authors

  • Beale, SJ; Wallman, JJ; Gutiérrez, M; Brown, KR; Laflamme, R

Published Date

  • November 2018

Published In

Volume / Issue

  • 121 / 19

Start / End Page

  • 190501 -

PubMed ID

  • 30468620

Pubmed Central ID

  • 30468620

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.121.190501

Language

  • eng