Most traditional applications of quantum cryptography are point-to-point communications, in which only two users can exchange keys. In this letter, we present a network scheme that enable quantum key distribution between multi-user with wavelength addressing. Considering the current state of wavelength division multiplexing technique, dozens or hundreds of users can be connected to such a network and directly exchange keys with each other. With the scheme, a 4-user demonstration network was built up and key exchanges were performed.
@article{arxiv.quant-ph/0610096,
title = {Quantum key distribution network with wavelength addressing},
author = {Xiao-Fan Mo and Tao Zhang and Fang-Xing Xu and Zheng-Fu Han and Guang-Can Guo},
journal= {arXiv preprint arXiv:quant-ph/0610096},
year = {2007}
}