  Solid state atom-like systems have great promise for linear optic quantum
computing and quantum communication but are burdened by phonon sidebands and
broadening due to surface charges. Nevertheless, coupling to a small mode
volume cavity would allow high rates of extraction from even highly dephased
emitters. We consider the nitrogen vacancy centre in diamond, a system
understood to have a poor quantum optics interface with highly distinguishable
photons, and design a silicon nitride cavity that allows 99 % efficient
extraction of photons at 200 K with an indistinguishability of > 50%,
improvable by external filtering. We analyse our design using FDTD simulations,
and treat optical emission using a cavity QED master equation valid at and
beyond strong coupling and which includes both ZPL broadening and sideband
emission. The simulated design is compact (< 10 um), and owing to its planar
geometry, can be fabricated using standard silicon processes. Our work
therefore points towards scalable fabrication of non-cryogenic atom-like
efficient sources of indistinguishable photons.
