Overcoming frequency resolution limits using a solid-state spin quantum sensor

• URL: http://arxiv.org/abs/2506.20416v1
• Date: Wed, 25 Jun 2025 13:31:34 GMT
• Title: Overcoming frequency resolution limits using a solid-state spin quantum sensor
• Authors: Qingyun Cao, Genko T. Genov, Yaoming Chu, Jianming Cai, Yu Liu, Alex Retzker, Fedor Jelezko,
• Abstract summary: We experimentally resolve two nearly identical incoherent signals using a solid-state spin quantum sensor.<n>Our results highlight the potential of quantum sensing to overcome conventional frequency resolution limitations.
• Score: 2.407182932306642
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The ability to determine precisely the separation of two frequencies is fundamental to spectroscopy, yet the resolution limit poses a critical challenge: distinguishing two incoherent signals becomes impossible when their frequencies are sufficiently close. Here, we demonstrate a simple and powerful approach, dubbed {\it superresolution quantum sensing}, which experimentally resolves two nearly identical incoherent signals using a solid-state spin quantum sensor. By identifying a sequence of ``magic interrogation times'', we eliminate quantum projection noise, overcoming the vanishing distinguishability of signals with near-identical frequencies. This leads to improved resolution, which scales as $t^{-2}$ in comparison to the standard $t^{-1}$ scaling. Together with a greatly reduced classical readout noise assisted by a nuclear spin, we are able to achieve sub-kHz resolution with a signal detection time of 80 microseconds. Our results highlight the potential of quantum sensing to overcome conventional frequency resolution limitations, with broad implications for precision measurements.

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