Beating the Ramsey limit on sensing with deterministic qubit control

M. O. Hecht, Kumar Saurav, Evangelos Vlachos, Daniel A. Lidar and Eli M. Levenson-Falk ()
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M. O. Hecht: University of Southern California
Kumar Saurav: University of Southern California
Evangelos Vlachos: University of Southern California
Daniel A. Lidar: University of Southern California
Eli M. Levenson-Falk: University of Southern California

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: 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.

Date: 2025
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DOI: 10.1038/s41467-025-58947-4

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