Quantum key distribution based on a quantum retrodiction protocol
  This paper is withdrawn. We study the quantum key distribution (QKD) protocol based on a quantum retrodiction protocol, namely the so-called mean king problem. The security is analyzed by considering the eavesdropping on both the preparation of the entangled pair and the transmission of the quantum state. This QKD protocol can generate efficiently a bit of raw key in every single run. We find that, for qubit system, it is more secure than the QKD Bennett-Brassard 1984 protocol and the six-state protocol. This QKD protocol works also for higher dimensional system. 
Han-Duo Shi, Yi-Nan Wang, Li Jing, Ru-Quan Wang, Liang-Zhu Mu and Heng   Fan
quant-ph