Correlated photon pair generation in low-loss double-stripe silicon nitride waveguides

TL;DR

This paper demonstrates correlated photon pair generation in low-loss double-stripe silicon nitride waveguides using spontaneous four-wave mixing, highlighting its potential for integrated quantum photonic chips despite current limitations from spontaneous Raman scattering.

Contribution

It introduces a novel waveguide structure for efficient photon pair generation, advancing integrated quantum photonics.

Findings

Coincidence-to-accidental ratio over 10 achieved

Spontaneous Raman scattering limits performance

Cooling can mitigate Raman scattering effects

Abstract

We demonstrate correlated photon pair generation via spontaneous four-wave mixing in a low-loss double-stripe silicon nitride waveguide with a coincidence-to-accidental ratio over 10. The coincidence-to-accidental ratio is limited by spontaneous Raman scattering, which can be mitigated by cooling in the future. This demonstration suggests that this waveguide structure is a potential platform to develop integrated quantum photonic chips for quantum information processing.