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We demonstrate a technique for precision sensing of temperature or themagnetic field by simultaneously driving two hyperfine transitions involvingdistinct electronic states of the nitrogen-vacancy center in diamond. Frequencymodulation of both driving fields is used with either the same or oppositephase, resulting in the immunity to fluctuations in either the magnetic fieldor the temperature, respectively. In this way, a sensitivity of 1.4 nTHz$^{-1/2}$ or 430 $\mu$K Hz$^{-1/2}$ is demonstrated. The presented techniqueonly requires a single frequency demodulator and enables the use ofphase-sensitive camera imaging sensors. A simple extension of the methodutilizing two demodulators allows for simultaneous, independent, andhigh-bandwidth monitoring of both the magnetic field and temperature.

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