Quantum communication is developed owing to the theoretically proven security of quantum mechanics, which may become the main technique in future information security. However, most studies and implementations are limited to two or several parties. Herein, we propose a fully connected quantum communication network without a trusted node for a large number of users. Using flexible wavelength demultiplex/multiplex and space multiplex technologies, 40 users are fully connected simultaneously without a trusted node by a broadband energy-time entangled photon pair source. This network architecture may be widely deployed in real scenarios such as companies, schools, and communities owing to its simplicity, scalability, and high efficiency.
@article{arxiv.2011.11319,
title = {Fully connected entanglement-based quantum communication network without trusted node},
author = {Xu Liu and Rong Xue and Heqing Wang and Hao Li and Xue Feng and Fang Liu and Kaiyu Cui and Zhen Wang and Lixing You and Yidong Huang and Wei Zhang},
journal= {arXiv preprint arXiv:2011.11319},
year = {2020}
}