Skip to main content

Controlling error orientation to improve quantum algorithm success rates

Publication ,  Journal Article
Murphy, DC; Brown, KR
Published in: Physical Review A
March 14, 2019

The success probability of a quantum algorithm constructed from noisy quantum gates cannot be accurately predicted from single-parameter metrics that compare noisy and ideal gates. We illustrate this concept by examining a system with coherent errors and comparing algorithm success rates for different choices of two-qubit gates that are constructed from composite pulse sequences, where the residual gate errors are related by a unitary transformation. As a result, all of the sequences have the same error relative to the ideal gate under any distance measure that is invariant under unitary transformations. However, the circuit success can vary dramatically by choosing error orientations that do not affect the final outcome and error orientations that cancel between conjugate controlled-nots, as demonstrated here with Clifford circuits, compiled Toffoli gates, and quantum simulation algorithms. The results point to the utility of both minimizing the error and optimizing the error direction and also to the advantages of using multiple control sequences for the same gate type within a single algorithm.

Duke Scholars

Altmetric Attention Stats
Dimensions Citation Stats

Published In

Physical Review A

DOI

EISSN

2469-9934

ISSN

2469-9926

Publication Date

March 14, 2019

Volume

99

Issue

3

Related Subject Headings

  • 51 Physical sciences
  • 49 Mathematical sciences
  • 34 Chemical sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Murphy, D. C., & Brown, K. R. (2019). Controlling error orientation to improve quantum algorithm success rates. Physical Review A, 99(3). https://doi.org/10.1103/PhysRevA.99.032318
Murphy, D. C., and K. R. Brown. “Controlling error orientation to improve quantum algorithm success rates.” Physical Review A 99, no. 3 (March 14, 2019). https://doi.org/10.1103/PhysRevA.99.032318.
Murphy DC, Brown KR. Controlling error orientation to improve quantum algorithm success rates. Physical Review A. 2019 Mar 14;99(3).
Murphy, D. C., and K. R. Brown. “Controlling error orientation to improve quantum algorithm success rates.” Physical Review A, vol. 99, no. 3, Mar. 2019. Scopus, doi:10.1103/PhysRevA.99.032318.
Murphy DC, Brown KR. Controlling error orientation to improve quantum algorithm success rates. Physical Review A. 2019 Mar 14;99(3).

Published In

Physical Review A

DOI

EISSN

2469-9934

ISSN

2469-9926

Publication Date

March 14, 2019

Volume

99

Issue

3

Related Subject Headings

  • 51 Physical sciences
  • 49 Mathematical sciences
  • 34 Chemical sciences