The zero-phonon transition rate of a nitrogen-vacancy center is enhanced by afactor of ~70 by coupling to a photonic crystal resonator fabricated inmonocrystalline diamond using standard semiconductor fabrication techniques.Photon correlation measurements on the spectrally filtered zero-phonon lineshow antibunching, a signature that the collected photoluminescence is emittedprimarily by a single nitrogen-vacancy center. The linewidth of the couplednitrogen-vacancy center and the spectral diffusion are characterized usinghigh-resolution photoluminescence and photoluminescence excitationspectroscopy.
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