Security and gain improvement of a practical quantum key distribution using a gated single-photon source and probabilistic photon-number resolution

作     者：Tomoyuki Horikiri Hideki Sasaki Haibo Wang Takayoshi Kobayashi 

作者机构：Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Corporation (JST) and Department of Physics Graduate School of Science University of Tokyo7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan 

出 版 物：《Physical Review A》 (物理学评论A辑：原子、分子和光学物理学)

年 卷 期：2005年第72卷第1期

页      面：012312-012312页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

主　　题：ENTANGLED PHOTONS OPTICAL-FIBER CRYPTOGRAPHY PERFORMANCE SYSTEMS STATES TIME 

摘      要：We propose a high security quantum key distribution (QKD) scheme utilizing one mode of spontaneous parametric downconversion gated by a photon number resolving detector. This photon number measurement is possible by using single-photon detectors operating at room temperature and optical fibers. By post selection, the multiphoton probability in this scheme can be reduced to lower than that of a scheme using an attenuated coherent light resulting in improvement of security. Furthermore, if distillation protocol (error correction and privacy amplification) is performed, the gain will be increased. Hence a QKD system with higher security and bit rate than the laser-based QKD system can be attained using present available technologies.