星地量子密钥分发中密钥纠错的编码模块

在星地量子密钥分发中,两个合法用户Alice和Bob通过星地链路窗口完成密钥分发.密钥分发后Alice和Bob拥有不一致的密钥序列X、Y,双方通过理想公共授权信道传送部分信息序列,得到一致的密钥序列,这一过程称为数据协调中的密钥纠错.在密钥纠错中,理想公共授权信道传输的信息序列是X经编码产生的校验序列,要求密钥序列的编码模块所占FPGA资源少,编码速度快.提出了一种基于FPGA和Turbo码的编码方案,其占用FPGA资源少,编码速度快,可根据需要选择编码码率.

Encoding module for key error correction in satellite-ground quantum key distribution

In satellite-ground quantum key distribution,two legitimate users,Alice and Bob,complete the key distribution by satellite-ground link window.After key distribution,Alice and Bob have inconsistent key sequences X and Y.The two sides transmit part of the information sequence through the ideal public authorized channel,and consistent key sequences are obtained,which is called key error correction in data reconciliation.In key error correction,information sequence transmitted by the ideal public authorized channel is the check sequence generated by X.Encode module of key sequence is required to occupy less FPGA resources,and the encoding speed is fast.A coding scheme based on FPGA and turbo codes is proposed.It takes less FPGA resources,fast coding speed and can select the coding bit rate according to the demands.