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A single nitrogen-vacancy (NV) center in diamond is a prime candidate for asolid-state quantum magnetometer capable of detecting single nuclear spins withprospective application to nuclear magnetic resonance (NMR) at the nanoscale.Nonetheless, an NV magnetometer is still less accessible to many chemists andbiologists, as its experimental setup and operational principle are starklydifferent from those of conventional NMR. Here, we design, construct, andoperate a compact tabletop-sized system for quantum sensing with a single NVcenter, built primarily from commercially available optical components andelectronics. We show that our setup can implement state-of-the-art quantumsensing protocols that enable the detection of single $^{13}$C nuclear spins indiamond and the characterization of their interaction parameters, as well asthe detection of a small ensemble of proton nuclear spins on the diamondsurface. This article providing extensive discussions on the details of thesetup and the experimental procedures, our system will be reproducible by thosewho have not worked on the NV centers previously.

Construction and operation of a tabletop system for nanoscale magnetometry with single nitrogen-vacancy centers in diamond