现有的量子密钥分发网络根据其节点不同可分为三类,即由信任节点构成的网络系统、由光学节点构成的网络系统、以及由量子节点构成的网络系统。讨论了由不同节点构成的网络系统的特点,并分别指出了各自的优缺点。最后指出,一个跨越全球的量子密钥分发网络需要由这三种不同的网络系统组成。

The quantum key distribution networks can be differentiated three main categories by the functionality that is implemented within the nodes: 1) trusted relay node; 2) optical node; 3) quantum node. The author discusses the characteristics of these three different networks, as well as lists its advantages and the disadvantages, respectively. In the last segment, the author points out that a global quantum key distribution network should be base on these three different networks.