采用纠缠辅助量子LDPC码和检错重传策略的量子直传通信方案

Quantum Secure Direct Communication by Using Quantum Entanglement-assisted LDPC Codes and ARQ Strategy

针对现有量子信息直传协议在有噪音量子信道下传输效率低及可靠性差的问题,提出了一种有效利用纠缠资源的量子安全直传通信方案.通过收发双方共享纠缠粒子作为辅助比特,采用纠缠辅助量子低密度校验码对量子态信息进行前向纠错保护,以提高系统在噪音环境下的传输可靠性.同时采用自动请求重传策略对量子态信息进行检错编码保护,当因窃听或强噪音导致译码获得的信息不正确时,则请求发端对该组信息进行编码重传操作.文中对所选用纠缠辅助量子低密度校验码在量子退极化噪音信道下的迭代译码性能进行了仿真,最后对方案的安全性进行了分析论证.

To improve the performances of the present Ping-Pong protocol systems over noisy channels,an efficient quantum secure direct communication scheme is proposed.Entanglement-assisted quantum low-density parity-check code is used to protect the encoded quantum information sequences against the channel noises,which improves the reliability of the quantum secure direct communication system.Furthermore,quantum automatic repeat-request protocol with error detection code is used to detect the strong channel noise effect,which improves the communication efficiency.Two steps of eavesdropping detection are taken to ensure the system security,and the iterative decoding performance of entanglement-assisted quantum low-density parity-check code is simulated over quantum depolarizing channel.