基于BB84协议的量子密钥分发系统研究

Analysis of Quantum Key Distribution System Based on BB84 Protocol

量子密码技术提出以后,得到了人们的普遍关注,它是目前唯一能够证明的绝对安全的保密通信方式。随着量子信息技术的发展,量子密钥分发技术开始从理论走向实际应用。为了研究在实际量子密钥分发系统中各部件对密钥分发效率的影响,提高密钥分发速率,对基于BB84协议的光纤量子密钥分发系统进行建模分析,研究了影响密钥分发效率的参数。数值仿真表明:准单光子源中平均光子数和光纤长度是影响最终密钥协商速率的关键参数。为进一步提高量子密钥分发系统的效率提供了参考。

The quantum cryptography has been concerned in worldwide after invention, Since it is the only way that can be proved to ensure the secure communication. The rapid development of quantum information technology makes quantum key distribution goes into the practical application from the theoretical research. For studying how the devices in practical quantum key distribution system based on the BB84 protocol effect the key distribution efficiency and improve the key distribution rate, a theoretic model relative to the system was represented,researched the parameter effects the key distribution efficiency. It was shown by the simulation that average photon number in the photon source and the length of optical fiber are the key parameters that affect the system rate. The work is useful for further impro- ving the system efficiency.