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The nitrogen-vacancy (NV) center in diamond allows room-temperaturewide-field quantum magnetometry and metrology for a small volume, which is animportant technology for applications in biology. Although coherence of the NVcenter has a limited frequency resolution of diamond magnetometry to 10-100kHz, recent studies have shown that a phase sensitive protocol can beat thecoherence limit on a confocal setup. Here, we report a new measurementprotocol, "iQdyne," for improving the frequency resolution of wide-fieldimaging beyond the coherence limit of the NV center. We demonstrate wide-fieldmagnetometry with a frequency resolution of 238 mHz and a magnetic sensitivityof 65 nT/sqrtHz, which are superior to the conventional XY8-based technique,which paves the way to in vivo microscale nuclear magnetic resonance imaging.We find that the experimental performance of iQdyne agrees well with that of ananalytical model.

Wide-field diamond magnetometry with millihertz frequency resolution and nanotesla sensitivity