Frequency correlated photon generation at telecom band using silicon nitride ring cavities

TL;DR

This paper demonstrates the generation of frequency correlated photon pairs at telecom wavelengths using silicon nitride ring cavities, advancing chip-scale quantum light sources for quantum technologies.

Contribution

It reports the first use of a 150-GHz silicon nitride ring cavity for generating frequency correlated photon pairs with a broad bandwidth and detailed phase matching analysis.

Findings

Generated 42 correlated frequency mode pairs

Achieved a bandwidth of 51.25 nm

Confirmed phase matching condition for photon pair generation

Abstract

Frequency entangled photon sources are in high demand in a variety of optical quantum technologies, including quantum key distribution, cluster state quantum computation and quantum metrology. In the recent decade, chip-scale entangled photon sources have been developed using silicon platforms, offering robustness, large scalability and CMOS technology compatibility. Here, we report the generation of frequency correlated photon pairs using a 150-GHz silicon nitride ring cavity. First, the device is characterized for studying the phase matching condition during spontaneous four-wave mixing. Next, we evaluate the joint spectrum intensity of the generated photons and confirm the photon pair generation in a total of42 correlated frequency mode pairs, corresponding to a bandwidth of 51.25 nm. Finally, the experimental results are analyzed and the joint spectral intensity is quantified in terms of the phase matching condition.