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Beating the Ramsey limit on sensing with deterministic qubit control

Author

Listed:
  • M. O. Hecht

    (University of Southern California
    University of Southern California)

  • Kumar Saurav

    (University of Southern California
    University of Southern California)

  • Evangelos Vlachos

    (University of Southern California
    University of Southern California)

  • Daniel A. Lidar

    (University of Southern California
    University of Southern California
    University of Southern California
    University of Southern California)

  • Eli M. Levenson-Falk

    (University of Southern California
    University of Southern California
    University of Southern California)

Abstract

Qubit frequency shifts, which often contain information about a target environment variable, are detected with Ramsey interference measurements. Unfortunately, the sensitivity of this protocol is limited by decoherence. We introduce a new protocol to enhance the sensitivity of a qubit frequency measurement in the presence of decoherence by applying a continuous drive to stabilize one component of the Bloch vector. We demonstrate our protocol on a superconducting qubit, enhancing sensitivity per measurement shot by 1.65 × and sensitivity per qubit evolution time by 1.09 × compared to Ramsey. We also explore the protocol theoretically, finding unconditional enhancements compared to Ramsey interferometry and maximum enhancements of 1.96 × and 1.18 × , respectively. Additionally, our protocol is robust to parameter miscalibrations. It requires no feedback and no extra control or measurement resources, and can be immediately applied in a wide variety of quantum computing and quantum sensor technologies.

Suggested Citation

  • M. O. Hecht & Kumar Saurav & Evangelos Vlachos & Daniel A. Lidar & Eli M. Levenson-Falk, 2025. "Beating the Ramsey limit on sensing with deterministic qubit control," Nature Communications, Nature, vol. 16(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-58947-4
    DOI: 10.1038/s41467-025-58947-4
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