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

TL;DR

This paper proposes a pulse-regulated, on-chip single-photon source at telecom wavelengths using a nanocavity-based optical parametric amplifier, demonstrating optimal pulse conditions for high purity and suppressed oscillations in photon statistics.

Contribution

It introduces a novel pulse-regulated single-photon source design based on a $$ nonlinear nanocavity, with numerical analysis of photon purity and brightness under pulsed excitation.

Findings

Optimal excitation pulse width maximizes single-photon purity.

Source brightness increases with longer excitation pulses.

Resonant operation suppresses oscillations in $g^{(2)}(0)$).

Abstract

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