Experimental High-Accuracy and Broadband Quantum Frequency Sensing via Geodesic Control

• URL: http://arxiv.org/abs/2601.19356v1
• Date: Tue, 27 Jan 2026 08:41:56 GMT
• Title: Experimental High-Accuracy and Broadband Quantum Frequency Sensing via Geodesic Control
• Authors: Si-Qi Chen, Qi-Tao Duan, Teng Li, He Lu,
• Abstract summary: We experimentally demonstrate a high-accuracy and broadband quantum frequency sensing protocol based on geodesic control.<n>By engineering an intrinsically single-frequency response, geodesic control enables bias-free frequency estimation with strong suppression of harmonic-induced systematic errors.
• Score: 6.460152496829688
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Accurate frequency estimation of oscillating signals over a broad bandwidth is a central task in quantum sensing, yet it is often compromised by spurious responses to higher-order harmonics in realistic multi-frequency environments. Here we experimentally demonstrate a high-accuracy and broadband quantum frequency sensing protocol based on geodesic control, implemented using the electron spin of a single nitrogen-vacancy center in diamond. By engineering an intrinsically single-frequency response, geodesic control enables bias-free frequency estimation with strong suppression of harmonic-induced systematic errors across a wide spectral range spanning from the megahertz to the gigahertz regime. Furthermore, by incorporating synchronized readout, we achieve millihertz-level frequency resolution under noisy signal conditions. Our results provide systematic experimental benchmarking of geodesic control for quantum frequency sensing and establish it as a practical approach for high-accuracy metrology in realistic environments.

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