QKD网络量子信道管理关键技术研究

Research on Key Technologies of Quantum Channel Management in QKD Network

随着网络的发展,网络传播的信息日益增多,其中某些信息需要较高的安全性,因此信息加密手段的研究具有重大意义。量子密钥分发(Quantum Key Distribution,QKD)技术基于量子力学中的不可克隆定理,即不可能复制一个未知的量子态而不对其造成扰动,保证了其无条件的安全性,能够实现安全的密钥分发。但目前QKD网络规模较小,不能满足大规模组网的需求。同时,经典网络的路由技术已经不能适应QKD网络,量子信道寻径成为了一个需要解决的问题。鉴于以上问题,提出了一种能够满足较大规模QKD通信的基于光开关切换的QKD网络模型,并重点设计了其网络结构和信令体系,在此基础上设计了一个用于量子信道寻径的先导信号协议,并提出了量子信道管理机制。经实验验证,该模型的性能良好。

With the development of the Internet,the information dissemination is increasing and the information security is more and more important.As some information requires higher security,researches on information encryption methods are of great significance.Quantum key distribution（QKD）technology is based on the no-cloning theorem,which states that it is impossible to create an identical copy of an arbitrary unknown quantum state.That is why QKD is unconditionally secure and it enables keys distribution to be safe.However,the current QKD network is small in size and cannot meet the needs of large-scale network.At the same time,the routing techniques on the classical networks can not apply to the QKD network.Finding out feasible quantum paths becomes a problem to be solved.In view of the above issues,a QKD network model which can meet the large-scale QKD communication was put forward according to optical switch,and its network structure and signaling systems were designed.Based on this,the pilot signal protocol and the quantum channel management mechanism were proposed.The results show that the model works well.