Precision temperature sensing in the presence of magnetic field noise and vice-versa using nitrogen-vacancy centers in diamond

TL;DR

This paper introduces a technique using nitrogen-vacancy centers in diamond for highly sensitive, simultaneous measurement of temperature and magnetic fields, effectively reducing noise impact through phase modulation.

Contribution

The authors develop a phase modulation method that enables simultaneous, noise-immune sensing of temperature and magnetic fields with simple hardware requirements.

Findings

Achieved sensitivity of 1.4 nT/Hz^{1/2} for magnetic field detection.

Achieved sensitivity of 430 μK/Hz^{1/2} for temperature measurement.

Enabled simultaneous, high-bandwidth monitoring of both parameters.

Abstract

We demonstrate a technique for precision sensing of temperature or the magnetic field by simultaneously driving two hyperfine transitions involving distinct electronic states of the nitrogen-vacancy center in diamond. Frequency modulation of both driving fields is used with either the same or opposite phase, resulting in the immunity to fluctuations in either the magnetic field or the temperature, respectively. In this way, a sensitivity of 1.4 nT Hz$^{-1/2}$ or 430 $\mu$K Hz$^{-1/2}$ is demonstrated. The presented technique only requires a single frequency demodulator and enables the use of phase-sensitive camera imaging sensors. A simple extension of the method utilizing two demodulators allows for simultaneous, independent, and high-bandwidth monitoring of both the magnetic field and temperature.