当前的量子通信协议和密钥分配系统，大多是基于点对点、一对一的单行系统，而现实中的通信网络是一对多、多对多的复杂系统。
The QKD protocols and the available QKD system are mostly based on the point-to-point, or one-to-one network, while the real communication needs one to many, many-to-many network.
PPP(点对点协议)是数据链路层协议，应用极为广泛，也是一个比较复杂的通信协议。
PPP (Point to Point protocol) is a link layer protocol, which be used in a good many occasion. On the other hand, itis a complex communicate protocol.
PPP(点对点协议)是数据链路层协议，应用极为广泛，也是一个比较复杂的通信协议。
PPP (Point to Point protocol) is a link layer protocol, which be used in a good many occasion. On the other hand, itis a complex communicate protocol.
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