Cavity-Driven Multispectral Gain for High-Sensitivity NV Center Magnetometers
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866918276540399616 |
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| author | Kumar, Himanshu Gupta, Rahul Ghosh, Saikat Dhar, Himadri Shekhar Saha, Kasturi |
| author_facet | Kumar, Himanshu Gupta, Rahul Ghosh, Saikat Dhar, Himadri Shekhar Saha, Kasturi |
| contents | We report a cavity-enabled solid-state magnetometer based on an NV ensemble coupled with a dielectric cavity, achieving 12 pT/$\sqrt{\rm{Hz}}$ 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/$\sqrt{\rm{Hz}}$, 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_03975 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Cavity-Driven Multispectral Gain for High-Sensitivity NV Center Magnetometers Kumar, Himanshu Gupta, Rahul Ghosh, Saikat Dhar, Himadri Shekhar Saha, Kasturi Quantum Physics Atomic Physics Optics We report a cavity-enabled solid-state magnetometer based on an NV ensemble coupled with a dielectric cavity, achieving 12 pT/$\sqrt{\rm{Hz}}$ 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/$\sqrt{\rm{Hz}}$, 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. |
| title | Cavity-Driven Multispectral Gain for High-Sensitivity NV Center Magnetometers |
| topic | Quantum Physics Atomic Physics Optics |
| url | https://arxiv.org/abs/2601.03975 |