# Double Quantum Magnetometry at Large Static Magnetic Fields

## TL;DR

This paper introduces a novel double quantum magnetometry protocol effective at large static magnetic fields, enhancing spectral signals and avoiding inhomogeneous broadening, applicable to various quantum sensors including nitrogen vacancy centers.

## Contribution

The authors develop a robust, general protocol for double quantum magnetometry at high magnetic fields that improves signal detection without broadening effects.

## Key findings

- Enables larger spectral signals through two-tone stroboscopic radiation.
- Avoids inhomogeneous broadening, preventing signal misinterpretation.
- Works under realistic conditions with moderate microwave power and errors.

## Abstract

We present a protocol to achieve double quantum magnetometry at large static magnetic fields. This is a regime where sensitive sample parameters, such as the chemical shift, get enhanced facilitating their characterization. In particular, our method delivers two-tone stroboscopic radiation patterns with modulated Rabi frequencies to achieve larger spectral signals. Furthermore, it does not introduce inhomogeneous broadening in the sample spectrum preventing signal misinterpretation. Moreover, our protocol is designed to work under realistic conditions such as the presence of moderate microwave power and errors on the radiation fields. Albeit we particularise to nitrogen vacancy centers, our protocol is general, thus applicable to distinct quantum sensors.