Quantum Key Distribution Network： Optimal Secret- Key- Aware Routing Method for Trust Relaying  

作　　者：Chao Yang Hongqi Zhang Jinhai Su 

机构地区：[1]Science and Technology Information Research Institute, Zhengzhou, Henan, China

出　　处：《China Communications》2018年第2期33-45,共13页中国通信（英文版）

摘　　要：Since the QKD network can overcome the distance limitation and expand the point-to-point QKD system to a multi-user key distribution system, some testing QKD networks have been built. However, all of this previous research seldom focused on the routing mechanism of QKD network in detail. Therefore, this paper focuses on the routing issue in trust relaying QKD network, builds a model of the trust relaying QKD network and proposes a secret-key-aware routing method. In our method, a dynamic model for the residual local key is proposed to forecast the residual local key quantity of each QKD link more accurately, and the cost of QKD link and relaying path are defined by multiple affecting factors, e.g. the generation, consumption rate and the local key depletion index. The proposed method is implemented and evaluated in a simulation environment. The simulation results show that our routing method can increase the success rate of key exchange, make all the QKD links participate key exchange with almost equal opportunity to achieve load balance, and trade off the local key generation and consumption of each QKD link. Therefore, our proposed method can contribute to effectively improve the holistic performance of the trust relaying QKD network.Since the QKD network can over- come the distance limitation and expand the point-to-point QKD system to a multi-user key distribution system, some testing QKD networks have been built. However, all of this previous research seldom focused on the routing mechanism of QKD network in detail. Therefore, this paper focuses on the routing issue in trust relaying QKD network, builds a model of the trust relaying QKD network and proposes a secret-key-aware routing meth- od. In our method, a dynamic model for the residual local key is proposed to forecast the residual local key quantity of each QKD link more accurately, and the cost of QKD link and relaying path are defined by multiple affecting factors, e.g. the generation, consumption rate and the local key depletion index. The pro- posed method is implemented and evaluated in a simulation environment. The simulation results show that our routing method can in- crease the success rate of key exchange, make all the QKD links participate key exchange with almost equal opportunity to achieve load balance, and trade off the local key generation and consumption of each QKD link. There- fore, our proposed method can contribute to effectively improve the holistic performance of the trust relaying QKD network.

关 键 词：quantum key distribution QKDnetwork routing algorithm 

分 类 号：TN918.4[电子电信—通信与信息系统]