title: Secure quantum key distribution with a single not-so-weak coherent pulse.
abstract: We propose a secure quantum key distribution (QKD) protocol using a single not-so-weak coherent qubit. With two preprocesses for random rotation and compensation, a key bit is encoded to a randomly polarized not-so-weak coherent qubit. We analyze the security of the QKD protocol, which counters the photon number splitting and the impersonation attacks. The estimated mean number of photon, which is less than 6.0, guarantees security. Additionally, we discuss the possibility of quantum secure direct communication.
authors: National Creative Research Initiative Center for Controlling Optical Chaos, Pai-Chai University, Daejeon, Korea. chmkim@mail.pcu.ac.kr
authors: Chil-Min
authors: CM
authors: Kim
authors: Yong-Wan
authors: YW
authors: Kim
authors: Young-Jai
authors: YJ
authors: Park