Entangled photon sources (EPS) are essential for quantum science and technology. Despite advancements in integrated optical platforms like thin-film lithium niobate, a scalable, high-performance, chip-scale EPS has remained elusive. We address this by demonstrating an electrically pumped, post-selection-free polarization-EPS, achieved through hybrid integration of a distributed feedback laser with thin-film lithium niobate chip which integrates periodically poled lithium niobate waveguides, beam splitter, and polarization rotator combiner. By injecting current into the chip, we realize a high-performance EPS with a bandwidth of 73 nm and an entanglement pair generation rate of 4.5*10^10 pairs/s/mW. The polarization entanglement shows Bell-state fidelities above 96% across frequency-correlated modes. This compact, integrated EPS enables key applications, including high-speed quantum key distribution via wavelength division multiplexing, satellite-based quantum communication, and entanglement-based quantum metrology.
@article{arxiv.2508.14566,
title = {Electrically pumped ultrabright entangled photons on chip},
author = {Xu-Feng Jiao and Ming-Yang Zheng and Yi-Hang Chen and Bo Cao and Xina Wang and Yang Liu and Cheng-Ao Yang and Xiu-Ping Xie and Chao-Yang Lu and Zhi-Chuan Niu and Qiang Zhang and Jian-Wei Pan},
journal= {arXiv preprint arXiv:2508.14566},
year = {2025}
}