Abstract: A 1550nm highspeed light source is realized for decoystate quantum key distribution (QKD). Signalstate and decoystate pulses are obtained with the same pulse duration of 25ps, and similar spectral characteristics by triggering laser diode (LD) with two different electrical pulses, where the pseudorandom numbers decide which state will be generated. The same duration and similar spectral characteristics effectively avoid possible eavesdroppers attacks through temporal and spectral analysis. Meanwhile, the intensity fluctuation is controlled to meet the requirements of practical decoystate QKD with random intensity error. In addition, with the help of a highspeed singlephoton detector, the light sources characteristics are analyzed.

Key words: quantum key distribution, decoy state, diode Laser

摘要： 实现了1.55μm波段的高速量子密钥分发(quantum key distribution, QKD)光源.通过产生2个不同的伪随机电脉冲驱动半导体激光器，得到了2种25ps、包含信号态和诱骗态的激光脉冲，并且它们的光谱特性十分相似，可以避免窃听者通过时频分析进行窃听.通过量化控制光源的强度涨落，以满足在随机强度误差下诱骗态量子密钥分发的实际应用.此外，经过高速的单光子探测器的测量，分析了所提出的光源的特性.

关键词: 量子密钥分发, 诱骗态, 半导体激光器