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We demonstrate an exceptionally bright photon source based on a singlenitrogen- vacancy center (NV-center) in a nanodiamond (ND), placed in thenanoscale gap between two monocrystalline silver cubes in a dimerconfiguration. The system is operated near saturation at a stable photon rateof 850 kcps, while we further achieve strongly polarized emission and highsingle photon purity, evident by the measured auto-correlation with ag(2)(0)-value of 0.08. These photon source features are key parameters forquantum technological applications, such as secure communication based onquantum key distribution. The cube antenna is assembled with an atomic forcemicroscope, which allows us to predetermine the dipole orientation of theNV-center and optimize cube positioning accordingly, while also tracking theevolution of emission parameters from isolated ND to the 1 and 2 cubeconfiguration. The experiment is well described by finite element modelling,assuming an instrinsic quantum efficiency of 0.35. We attribute the largephoton rate of the assembled photon source, to increased quantum efficiency ofthe NV-center and high antenna efficiency.

Ultrabright Linearly Polarized Photon Generation from a Nitrogen Vacancy Center in a Nanocube Dimer Antenna