Quantum sensing with arbitrary frequency resolution via correlation measurements

• URL: http://arxiv.org/abs/2504.12134v1
• Date: Wed, 16 Apr 2025 14:48:23 GMT
• Title: Quantum sensing with arbitrary frequency resolution via correlation measurements
• Authors: Jungbae Yoon, Keyuan Zhong, Guoqing Wang, Boning Li, Donghun Lee, Paola Cappellaro,
• Abstract summary: We introduce a novel protocol that achieves high-frequency spectral resolution with quantum sensors.<n>Our method extends the sensing dynamic range to higher than the system's Rabi frequency.<n>Our approach operates more robustly with respect to the magnetic field's amplitude.
• Score: 9.280448226898464
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Achieving high-frequency spectral resolution with quantum sensors, while crucial in fields ranging from physical to biological sciences, is challenging due to their finite coherence time. Here, we introduce a novel protocol that achieves this goal by measuring phase correlations of AC magnetic fields using ensembles of NV centers. Our method extends the sensing dynamic range to frequencies higher than the system's Rabi frequency while achieving arbitrary frequency resolution, limited only by the target field coherence time. Moreover, our approach operates more robustly with respect to the magnetic field's amplitude. Thanks to this robustness, our protocol allows the application of more $\pi$-pulses in pulse sequences such as CPMG, enabling the decoupling of a broader range of frequency noise. The higher harmonics generated in this process continue to act as a part of the signal, ultimately improving the frequency resolution. This method paves the way for achieving arbitrary frequency resolution with improved performances, making it highly versatile for quantum sensing applications across diverse scientific fields.

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