Quantum spectral analysis by continuous measurement of Landau-Zener transitions

• URL: http://arxiv.org/abs/2306.01622v4
• Date: Thu, 7 Dec 2023 05:42:30 GMT
• Title: Quantum spectral analysis by continuous measurement of Landau-Zener transitions
• Authors: Christopher C. Bounds, Josh P. Duff, Alex Tritt, Hamish A. M. Taylor, George X. Coe, Sam J. White, L. D. Turner (School of Physics and Astronomy, Monash University, Melbourne, Australia)
• Abstract summary: We demonstrate the simultaneous estimation of signal frequency and amplitude by a single quantum sensor in a single experimental shot. We sense a magnetic signal with $20textpT$ precision in amplitude, and near-transform-limited precision in frequency, in a single $300textms$ sweep from $7$ to $13textkHz$. The protocol realizes a swept-sine quantum spectrum analyzer, potentially sensing hundreds or thousands of channels with a single quantum sensor.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: We demonstrate the simultaneous estimation of signal frequency and amplitude by a single quantum sensor in a single experimental shot. Sweeping the qubit splitting linearly across a span of frequencies induces a non-adiabatic Landau-Zener transition as the qubit crosses resonance. The signal frequency determines the time of the transition, and the amplitude its extent. Continuous weak measurement of this unitary evolution informs a parameter estimator retrieving precision measurements of frequency and amplitude. Implemented on radiofrequency-dressed ultracold atoms read out by a Faraday spin-light interface, we sense a magnetic signal with $20~\text{pT}$ precision in amplitude, and near-transform-limited precision in frequency, in a single $300~\text{ms}$ sweep from $7$ to $13~\text{kHz}$. The protocol realizes a swept-sine quantum spectrum analyzer, potentially sensing hundreds or thousands of channels with a single quantum sensor.

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