High-frequency dual-channel lock-in detection via rapidly oscillating driving

Abstract:Here we propose a general protocol for dual-channel lock-in detection of high-frequency ac signals. We find that the effect of a high-frequency target signal can be modulated through the application of rapidly oscillating driving fields. Based on this mechanism, we develop a quantum dual-channel lock-in detection protocol for high-frequency signals, which not only extends the accessible frequency range of quantum sensing but also enables the simultaneous estimation of the signal amplitude and initial phase. Furthermore, we present a feasible implementation scheme of the protocol based on nitrogen-vacancy centers in diamond. Numerical simulations demonstrate that the proposed protocol can effectively filter out background noise and significantly improve the signal-to-noise ratio. Our results provide a promising approach for realizing noise-resistant detection of weak signals in the high-frequency regime.

arXiv:2607.17854 [quant-ph]

(or arXiv:2607.17854v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2607.17854 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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