A novel secure communication protocol
Qing-yu Cai · arXiv (Cornell University) · 2003
Based on the 'ping-pong' quantum communication protocol proposed by Bostr$\\overset{..}{o}$m and Felbinger [Phys. Rev. Lett. 89, 187902 (2002)], we show a deterministic secure direct communication protocol using single qubit in mixed state. This single qubit protocol is an asymptotically secure key distribution. It can be realized with today's technology. In principle, even if the single qubit source is not perfect, this protocol is also secure.