Is quantum bit commitment really impossible
Jeong Woon Choi, Dowon Hong, Ku-Young Chang, Dong Pyo, Soojoon Lee · arXiv (Cornell University) · 2009
Quantum bit commitment has been known to be impossible by the independent proofs of Mayers, and Lo and Chau, even though several quantum bit commitment protocols have been proposed. However, we here point out that their proof is available only for one-way quantum bit commitment protocols, and present a simple and efficient quantum bit commitment protocol with two-way quantum communications. The unconditional security of our protocol is guaranteed by the additional unknownness and randomness generated by both users.