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A scalable on-chip single-photon source at telecommunications wavelengths isan essential component of quantum communication networks. In this work, wenumerically construct a pulse-regulated single-photon source based on anoptical parametric amplifier in a nanocavity. Under the condition of pulsedexcitation, we study the photon statistics of the source using the Monte Carlowave-function method. The results show that there exits an optimum excitationpulse width for generating high-purity single photons, while the sourcebrightness increases monotonically with increasing excitation pulse width. Moreimportantly, our system can be operated resonantly and we show that in thiscase the oscillations in $g^{(2)}(0)$ is completely suppressed.

Pulse-regulated single-photon generation via quantum interference in a $\chi^{(2)}$ nonlinear nanocavity