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We describe a general analytical framework of a nanoplasmonic cavity-emittersystem interacting with a dielectric photonic waveguide. Taking into accountemitter quenching and dephasing, our model directly reveals the single photonextraction efficiency, $\eta$, as well as the indistinguishability, $I$, ofphotons coupled into the waveguide mode. Rather than minimizing the cavitymodal volume, our analysis predicts an optimum modal volume to maximize $\eta$that balances waveguide coupling and spontaneous emission rate enhancement.Surprisingly, our model predicts that near-unity indistinguishability ispossible, but this requires a much smaller modal volume, implying a fundamentalperformance trade-off between high $\eta$ and $I$ at room temperature. Finally,we show that maximizing $\eta I$ requires that the system has to be driven inthe weak coupling regime because quenching effects and decreased waveguidecoupling drastically reduce $\eta$ in the strong coupling regime.

Integrated nanoplasmonic quantum interfaces for room temperature single photon sources