Quantifying the performance of multi-pulse quantum sensing

Heisenberg-Limited Waveform Estimation with Solid-State Spins in Diamond

“…Without taking the decoherence into consideration, the sensitivity scales as the dashed gray line. The best experimental sensitivity (blue dots) is 370 nT/ √ Hz for k = 64. charged NV center in diamond [10,37,[41][42][43][44], where a substitutional nitrogen atom is next to a vacancy, forming a spin triplet system in its ground state. A roomtemperature home-built confocal microscopy is employed to image, initialize and read out the NV center in a singlecrystal synthetic diamond sample, which is mounted on a three-axis closed-loop piezoelectric stage for submicrometer-resolution scanning.…”