Nanophotonic magnetometry in a spin-dense diamond cavity
- URL: http://arxiv.org/abs/2511.19831v1
- Date: Tue, 25 Nov 2025 01:46:17 GMT
- Title: Nanophotonic magnetometry in a spin-dense diamond cavity
- Authors: Nicholas J. Sorensen, Elham Zohari, Joshua S. Wildeman, Sigurd Flågan, Vinaya K. Kavatamane, Paul E. Barclay,
- Abstract summary: Quantum sensors based on the nitrogen-vacancy center in diamond are leading platforms for high-sensitivity magnetometry with nanometer-scale resolution.<n>Here, we realize an integrated platform that overcomes this trade-off by fabricating monolithic whispering-gallery-mode cavities from a diamond chip.<n>We achieve a photon-shot-noise-limited DC sensitivity of $58,textnT/sqrttextHz$ -- the best sensitivity reported to date for a nanofabricated cavity-based magnetometer.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Quantum sensors based on the nitrogen-vacancy (NV) center in diamond are leading platforms for high-sensitivity magnetometry with nanometer-scale resolution. State-of-the-art implementations, however, typically rely on bulky free-space optics or sacrifice spatial resolution to achieve high sensitivities. Here, we realize an integrated platform that overcomes this trade-off by fabricating monolithic whispering-gallery-mode cavities from a diamond chip containing a high density of NV centers and by evanescently coupling excitation to and photoluminescence from the cavity using a tapered optical fiber. Employing a lock-in-amplified Ramsey magnetometry scheme, we achieve a photon-shot-noise-limited DC sensitivity of $58\,\text{nT}/\sqrt{\text{Hz}}$ -- the best sensitivity reported to date for a nanofabricated cavity-based magnetometer. The microscopic cavity size enables sub-micrometer-scale spatial resolution and low-power operation, while fiber-coupling provides a path to scalable on-chip integration. Arrays of such sensors could enable NV-NMR spectroscopy of sub-nanoliter samples, new magnetic-gradient imaging architectures, and compact biosensing platforms.
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