Frequency encoding of quantum information together with fiber and integrated photonic technologies can significantly reduce the complexity and resource requirements for realizing all-photonic quantum networks. The key challenge for such frequency domain processing of single photons is to realize coherent and selective interactions between quantum optical fields of different frequencies over a range of bandwidths. Here, we report frequency-domain Hong-Ou-Mandel interference with spectrally distinct photons generated from a chip-based microresonator. We use four-wave mixing to implement an active frequency beam-splitter and achieve interference visibilities of 0.95±0.02. Our work establishes four-wave mixing as a tool for selective high-fidelity two-photon operations in the frequency domain which, combined with integrated single-photon sources, provides a building block for frequency-multiplexed photonic quantum networks.
@article{arxiv.2003.06533,
title = {Frequency-Domain Quantum Interference with Correlated Photons from an Integrated Microresonator},
author = {Chaitali Joshi and Alessandro Farsi and Avik Dutt and Bok Young Kim and Xingchen Ji and Yun Zhao and Andrew M. Bishop and Michal Lipson and Alexander L. Gaeta},
journal= {arXiv preprint arXiv:2003.06533},
year = {2020}
}