Quantum key distribution (QKD) networks hold promise for sharing secure randomness over multi-partities. Most existing QKD network schemes and demonstrations are based on trusted relays or limited to point-to-point scenario. Here, we propose a flexible and extensible scheme named as open-destination measurement-device-independent QKD network. The scheme enjoys security against untrusted relays and all detector side-channel attacks. Particularly, any users can accomplish key distribution under assistance of others in the network. As an illustration, we show in detail a four-user network where two users establish secure communication and present realistic simulations by taking into account imperfections of both sources and detectors.
@article{arxiv.2009.13439,
title = {Open-destination measurement-device-independent quantum key distribution network},
author = {Wen-Fei Cao and Yi-Zheng Zhen and Yu-Lin Zheng and Shuai Zhao and Feihu Xu and Li Li and Zeng-Bing Chen and Nai-Le Liu and Kai Chen},
journal= {arXiv preprint arXiv:2009.13439},
year = {2020}
}