Time-correlated Photons from a In$_{0.5}$Ga$_{0.5}$P Photonic Crystal Cavity on a Silicon Chip

TL;DR

This paper demonstrates efficient generation of time-correlated photon pairs using a triply-resonant Four-Wave-Mixing process in an InGaP Photonic Crystal cavity integrated on a silicon chip, advancing quantum photonics integration.

Contribution

It introduces a novel integrated photonic crystal cavity source for photon pair generation with significantly higher efficiency than previous ring resonator-based sources.

Findings

Achieved a photon pair generation rate of 5 MHz.

Demonstrated active spectral alignment to optimize efficiency.

Integrated the source on a silicon photonic circuit for quantum applications.

Abstract

Time-correlated photon pairs are generated by triply-resonant Four-Wave-Mixing in a In$_{0.5}$Ga$_{0.5}$P Photonic Crystal cavitiy. Maximal efficiency is reached by actively compensating the residual spectral misalignment of the cavity modes. The generation rate reaches 5 MHz in cavities with Q-factor $\approx 4\times 10^4$, more than one order of magnitude larger than what is measured using ring resonators with similar Q factors fabricated on the same chip. The Photonic Crystal source is integrated on a Si photonic circuit, an important asset for applications in quantum technologies.