Abstract: Considering noise in the quantum channel of BB84 quantum key distribution protocol，an improved model of BB84 protocol with quantum error correction code，such as Quantum Low Density Parity Check code（QLDPC） is proposed in this paper.By numerical simulation，the effect of quantum error correction code on BB84 protocol is analyzed in the case of the efficiency of transmission rate.The results show that quantum LDPC codes have good ability to overcome the noise，raise the efficiency of transmission rate and verify the availability of the improved model.

摘要： 针对BB84量子密钥分配协议中量子信道存在噪声，设计一种带有量子纠错码的改进的BB84协议模型，在模型中用量子低密度奇偶校验码（量子LDPC）作为纠错码对发送量子态进行编码。通过数值仿真，从密钥传输效率的角度分析量子纠错编码对BB84协议的影响。结果表明量子LDPC码能克服噪声，提高了密钥传输效率，验证了在含噪量子信道中改进的BB84协议模型的有效性。