QKD系统中基于EA电路的诱骗态实现

使用诱骗态量子秘钥方案可以解决因光子数分离攻击而导致的安全漏洞,保证了长距离量子通信的安全。本文介绍了量子通信的相关原理,通过对电吸收调制电路和激光器驱动电路的设计,精确控制产生了1550 nm波段的窄脉冲,经过内部调制成功制备诱骗态光脉冲,其强度约为信号态光脉冲的三分之一,因激光器的同一性而具有一致的光学特征从而避免了时频窃听,并具有强度可调的优点。

Realization of decoy state based on EA circuit in QKD system

The security loopholes caused by the Photon-Number-Splitting Attack could be solved by using the decoy quantum key scheme,and the security of long-distance quantum communication could be guaranteed. The principle of quantum communication was introduced in this paper. The electro-absorption modulation circuit and the laser drive circuit were designed. The 1550 nm narrow pulse was precisely controlled and generated. After the internal modulation,the decoy light pulse was successfully prepared. Its intensity was about one-third of the signal state,and the uniform optical feature was owned by the same character of the laser so as to avoid time-frequency eavesdropping,and has the advantage of adjustable intensity.