Indistinguishability of single photons from independent sources is critically important for scalable quantum technologies. We provide a comprehensive comparison of single-photon indistinguishability of different kinds of cavity quantum electrodynamics (CQED) systems by numerically simulating Hong-Ou-Mandel (HOM) two-photon interference. We find that the CQED system using nature atoms exhibit superiority in indistinguishability, benefiting from the inherently identical features. Moreover, a Λ−type three-level atoms show essential robust against variation of various system parameters because it exploits the two ground states with considerable smaller decay rates for single-photon generation. Furthermore, a machine learning-based framework is proposed to significantly and robustly improve single-photon indistinguishability for non-identical two CQED systems. This work may pave the way for designing and engineering reliable and scalable photon-based quantum technologies.
@article{arxiv.2404.11193,
title = {Photonic indistinguishability characterization and optimization for cavity-based single-photon source},
author = {Miao Cai and Mingyuan Chen and Jiangshan Tang and Keyu Xia},
journal= {arXiv preprint arXiv:2404.11193},
year = {2024}
}