Chinese Optics Letters, 2014, 12 (7): 072702, Published Online: Jun. 26, 2014
Practical high-speed light source for decoy-state quantum key distribution Download: 606次
270.5568 Quantum cryptography 270.5565 Quantum communications 140.5960 Semiconductor lasers 040.1345 Avalanche photodiodes (APDs)
Abstract
High-speed light source is realized for decoy-state quantum key distribution (QKD) at telecom wavelength of 1.55 μm. By implementing two different electrical pulses together and triggering with 100 MHz pseudorandom number to drive the laser diode, the signal-state and the decoy-state pulses are prepared with identical pulse duration of 25 ps and similar spectral characteristics, avoiding the eavesdropper's attack by temporal and spectral analysis. The intensity fluctuation of the light source is quantified to satisfy the practical decoy-state QKD with random intensity error. The characteristics of the light source are analyzed with a high-speed single-photon detector.
Haibin Du, Yan Liang, Shengxiang Zhang, Xiuliang Chen, Lin Zhao, Jie Chen, Heping Zeng. Practical high-speed light source for decoy-state quantum key distribution[J]. Chinese Optics Letters, 2014, 12(7): 072702.