Uncorrelated photon pair generation from an integrated silicon nitride resonator measured by time resolved coincidence detection

TL;DR

This paper demonstrates a method to generate and measure uncorrelated photon pairs from a silicon nitride resonator with high purity using time-resolved coincidence detection and tailored temporal correlations.

Contribution

It introduces a technique for measuring joint temporal intensity in high-Q cavities and shows how to tailor photon pair correlations using a resonant interferometric coupler.

Findings

Achieved 98.67% purity in photon pairs

Demonstrated independent tuning of resonator quality factors

Applied time-resolved coincidence detection to silicon nitride resonators

Abstract

We measure the joint temporal intensity of signal and idler photon pairs generated by spontaneous four wave mixing in a silicon nitride microresonator by time-resolved coincidence detection. This technique can be applied to any high-Q optical cavity whose photon lifetime exceeds the duration of the pump pulse. We tailor the temporal correlation of photon pairs by using a resonant interferometric coupler, a device that allows us to independently tune the quality factors of the pump and signal and idler resonances.Temporal post-selection is used to accurately measure the temporal emission of the device, demonstrating a purity of 98.67(1)%.