The controlled and coherent manipulation of individual quantum systems is afundamental key for the development of quantum information processing. Thenitrogen-vacancy (NV) color center in diamond is a promising system since itsphotoluminescence is perfectly stable at room temperature and its electron spincan be optically read-out at the individual level. We review here theexperiments currently realized in our laboratory, concerning the use of singleNV color center as single photon source and the coherent magnetic manipulationof the electron spin associated to a single NV color center. Furthermore, wedemonstrate a nanoscopy experiment based on saturation absorption effect, whichallows to optically pin-point single NV color center at a sub-? resolution.This opens a possibility to independently address two or multiplemagnetically-coupled single NV color centers, which is a necessary step towardthe realization of a diamond-based quantum computer.
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