We propose a quantum key distribution (QKD) protocol that enables three parties agree at once on a shared common random bit string in presence of an eavesdropper without use of entanglement. We prove its unconditional security and analyze the key rate.
@article{arxiv.0708.0902,
title = {Quantum multiparty key distribution protocol without use of entanglement},
author = {Ryutaroh Matsumoto},
journal= {arXiv preprint arXiv:0708.0902},
year = {2007}
}