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Angle-robust two-qubit gates in a linear ion crystal

Publication ,  Journal Article
Jia, Z; Huang, S; Kang, M; Sun, K; Spivey, RF; Kim, J; Brown, KR
Published in: Physical Review A
March 1, 2023

In trapped-ion quantum computers, two-qubit entangling gates are generated by applying spin-dependent force which uses phonons to mediate interaction between the internal states of the ions. To maintain high-fidelity two-qubit gates under fluctuating experimental parameters, robust pulse-design methods are applied to remove the residual spin-motion entanglement in the presence of motional mode-frequency drifts. Here we propose an improved pulse-design method that also guarantees the robustness of the two-qubit rotation angle against uniform mode-frequency drifts by concatenating pulses with opposite sensitivity of the angle to mode-frequency drifts. We experimentally verify significantly improved robustness of the rotation angle against uniform mode-frequency drifts, as well as observe an improvement in gate fidelity from 97.84(10)% to 98.11(11)%, compared to a single frequency-modulated pulse.

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Published In

Physical Review A

DOI

EISSN

2469-9934

ISSN

2469-9926

Publication Date

March 1, 2023

Volume

107

Issue

3

Related Subject Headings

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

Citation

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Jia, Z., Huang, S., Kang, M., Sun, K., Spivey, R. F., Kim, J., & Brown, K. R. (2023). Angle-robust two-qubit gates in a linear ion crystal. Physical Review A, 107(3). https://doi.org/10.1103/PhysRevA.107.032617
Jia, Z., S. Huang, M. Kang, K. Sun, R. F. Spivey, J. Kim, and K. R. Brown. “Angle-robust two-qubit gates in a linear ion crystal.” Physical Review A 107, no. 3 (March 1, 2023). https://doi.org/10.1103/PhysRevA.107.032617.
Jia Z, Huang S, Kang M, Sun K, Spivey RF, Kim J, et al. Angle-robust two-qubit gates in a linear ion crystal. Physical Review A. 2023 Mar 1;107(3).
Jia, Z., et al. “Angle-robust two-qubit gates in a linear ion crystal.” Physical Review A, vol. 107, no. 3, Mar. 2023. Scopus, doi:10.1103/PhysRevA.107.032617.
Jia Z, Huang S, Kang M, Sun K, Spivey RF, Kim J, Brown KR. Angle-robust two-qubit gates in a linear ion crystal. Physical Review A. 2023 Mar 1;107(3).

Published In

Physical Review A

DOI

EISSN

2469-9934

ISSN

2469-9926

Publication Date

March 1, 2023

Volume

107

Issue

3

Related Subject Headings

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