关键词: 量子密钥分发, 诱骗态, 半导体激光器

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