We report a cavity-enabled solid-state magnetometer based on an NV ensemble coupled with a dielectric cavity, achieving 12 pT/Hz sensitivity and a nearly threefold gain from multispectral features. The features originate from cavity-induced splitting of the NV hyperfine levels and leverages robust quantum coherence in the doubly dressed states of the system to achieve high sensitivity. We project simulated near-term sensitivities approaching 100 fT/Hz, close to the Johnson-Nyquist limit. Our results establish frequency multiplexing as a new operational paradigm, offering a robust and scalable quantum resource for metrology under ambient conditions.
@article{arxiv.2601.03975,
title = {Cavity-Driven Multispectral Gain for High-Sensitivity NV Center Magnetometers},
author = {Himanshu Kumar and Rahul Gupta and Saikat Ghosh and Himadri Shekhar Dhar and Kasturi Saha},
journal= {arXiv preprint arXiv:2601.03975},
year = {2026}
}
Comments
The first two authors contributed equally to this work. 6 pages, 4 figures