Cavity-Driven Multispectral Gain for High-Sensitivity NV Center Magnetometers

TL;DR

This paper introduces a cavity-enhanced solid-state magnetometer using NV centers that achieves high sensitivity and multispectral gain, enabling scalable quantum sensing under ambient conditions.

Contribution

It demonstrates a novel cavity-enabled approach that leverages multispectral features and quantum coherence for improved magnetometer sensitivity.

Findings

Achieved 12 pT/√Hz sensitivity in NV-based magnetometry.

Realized nearly threefold gain from multispectral cavity features.

Projected sensitivities approaching 100 fT/√Hz near the Johnson-Nyquist limit.

Abstract

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.