Generating pure single-photon states via spontaneous four-wave mixing in a system of coupled microresonators

TL;DR

This paper proposes an on-chip single-photon source using coupled microresonators and spontaneous four-wave mixing, optimizing parameters to produce high-purity, frequency-uncorrelated single photons for quantum information applications.

Contribution

The paper introduces a novel design and optimization method for a microresonator-based single-photon source that enhances photon purity by suppressing dispersion effects.

Findings

Optimal coupling parameters maximize photon purity.

Spectral width of pump pulse influences photon purity.

Design achieves high-purity heralded single-photon generation.

Abstract

We present the optimal design for an on-chip single-photon source based on spontaneous four-wave mixing in a system of coupled ring microresonators, which provides frequency uncorrelated joint spectral amplitude of the biphoton field and thereby generation of pure single-photon heralded states. A simple method is proposed for suppressing negative dispersion effects by optimizing the controlled spectroscopic parameters of the system. It shown that the optimal coupling parameters, in combination with the optimal spectral width of the pump pulse, give rise to the highest purity of the heralded photons for a given pump linewidth.