Nitrogen-vacancy (NV) centers in diamond have been shown to be capable of detecting ac magnetic fields with high sensitivity, spectral resolution, and spatial resolution. However, most studies so far have focused on the regime of time-averaged or time-correlated measurements, while little attention has been paid to the single-shot regime. Here we show that the amplitude and phase of an ac field can be retrieved from a single pair of two consecutive measurements. We demonstrate this concept by measuring a 4 MHz ac field with a per-shot amplitude and phase sensitivity of $78\mathrm{nT}$ and $63\mathrm{mrad}$, respectively, at a temporal resolution of $320\mathrm{\mu }\mathrm{s}$. We also investigate the effects and quantify the errors resulting from probe frequency detunings, as well as operating in the strong field regime. Moreover, we showcase the ability of the measurement protocol to dynamically change the probe frequency in real time. This work advances the use of NV centers for real-time measurements of ac magnetic fields.

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• Magnetometry
• Nitrogen vacancy centers in diamond
• Quantum cryptography
• Quantum sensing
• Spin optoelectronics
• Wireless communication networks
• Radio frequency techniques