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Solid state quantum emitters are between the most promising candidates forsingle photon generation in quantum technologies. However, they suffer fromdecoherence effects which limit their efficiency and indistinguishability. Forinstance, the radiation emitted in the zero phonon line (ZPL) of most colorcenters is on the order of a few percent (e.g. $NV^-$ centers in Diamond,$V_{Si}V_{C}$ in SiC) limiting the emission rate of single photons as well asthe efficiency. At the same time, reliable interfacing with photons in anintegrated manner still remains a challenge on both diamond and SiC technology.Here we develop photonic crystal cavities with Q factors in the order of 7,100in 3C SiC. We discuss how this high confinement cavity can significantlyenhance the fraction of photons emitted in the ZPL and improve theircharacteristics. In particular, the increased efficiency and improvedindistinguishability can open the way to quantum technologies in the solidstate.

High-Q/V two-dimensional photonic crystals cavities in 3C-SiC