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As a potential candidate for quantum computation and metrology, the nitrogenvacancy (NV)center in diamond presented both challenges and opportunitiesresulted from charge state conversion. By utilizing different lasers for thephoton-induced charge state conversion, we achieved the sub-diffraction chargestate manipulation. The charge state depletion (CSD) microscopy resolution wasimproved to 4.1 nm by optimizing the laser pulse sequences. Subsequently, theelectron spin state dynamics of adjacent NV centers were selectively detectedvia the CSD. The experimental results demonstrated that the CSD can improve thespatial resolution of the measurement of NV centers for nanoscale sensing andquantum information.

Sub-diffraction optical manipulation of the chargestate of nitrogen vacancy center in diamond