Impact of picosecond laser pulse waveform on detection efficiency of gated-mode avalanche photodiodes for quantum key distribution |
| |
Authors: | Junbin Fang Changjun Liao Zhenjun Wei Songhao Liu |
| |
Institution: | a Laboratory of Photonic Information Technology, SIPSE & LQIT, South China Normal University, Guangzhou 510006, Chinab Department of Computer Science, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China |
| |
Abstract: | Detection efficiency is one of the key parameters that affect the performance of gated-mode avalanche photodiodes in quantum key distribution. In this paper, the impact of the waveform of faint picosecond laser pulses on detection efficiency is investigated both experimentally and analytically. Two kinds of laser pulses are attenuated to the single photon level to measure and plot single photon detection efficiency versus synchronous delay between the detector and the laser source. The results show that the narrower laser pulse with single peak can be detected with about 9% higher detection efficiency and lead to a lower QBER than the pulse with subpeak and a broadened pedestal. |
| |
Keywords: | Quantum key distribution Detection efficiency Avalanche photodiode Gated-mode |
本文献已被 ScienceDirect 等数据库收录! |