摘要
基于预报单光子光源,提出了一种实现简单的非正交一诱惑态方案。由于非正交编码协议需要估计参量的项数是BB 84协议的两倍,所以无法完全采用被动诱惑态方案来降低实现的难度。并考虑到实际应用中,激光器不能做到完全消光而无法制备真正的真空态。因此,将主动诱惑态思想和被动诱惑态思想相结合,把所需诱惑态减少为一个弱光强态。数值仿真表明,由于被动诱惑态思想的加入,非正交一诱惑态方案可以获得较高的密钥生成效率,安全传输距离较理论极限安全传输距离只少2.2 km;且相比于已经提出的非正交诱惑态方案,因为诱惑态数量的减少而更容易实现。
A simple non-orthogonal decoy state protocol with one weak decoy state is presented with a heralded single photon source （HSPS）. Because the number of estimation terms in non-orthogonal encoding protocol is double of that in the Bennett-Brassard 1984 （BB 84） protocol, the passive decoy state method is unsuitable for non-orthogonal encoding protocol to decrease the implementation difficulty. Considering the imperfect extinction ratio of the practical laser, vacuum states are not prepared easily. Therefore, this paper combines passive decoy state method with active decoy state method to decrease the number of decoy state to one weak decoy state. The simulation results show that the protocol with one weak decoy state can obtain good key generation rate by the passive decoy idea and the secure transmission distance is only 2.2 km less than that of the theoretical limit of an infinite decoy state protocol. Compared with the existing non-orthogonal decoy state protocols, the proposed protocol is easier to implement.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2011年第2期197-200,共4页
Journal of University of Electronic Science and Technology of China
基金
国家863计划(2009AAJ128)
关键词
诱惑态
非正交编码协议
量子密钥分配
密钥生成效率
安全传输距离
decoy state
non-orthogonal encoding protocol
quantum key distribution
secure key generation rate
secure transmission distance
