A 300-MHz Bandwidth Balanced Homodyne Detector for Continuous Variable Quantum Key Distribution  

作　　者：HUANG Duan FANG Jian WANG Chao HUANG Peng ZENG Gui-Hua 黄端;房坚;汪超;黄鹏;曾贵华(State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiaotong University,Shanghai 200240)

机构地区：[1]State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiaotong University,Shanghai 200240

出　　处：《Chinese Physics Letters》2013年第11期117-119,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 61170228;China Postdoctoral Science Foundation under Grant No 2013M540365.

摘　　要：In Gaussian-modulated coherent-state quantum key distribution,the measurement of quadratures of coherent states is performed by using a homodyne detector.However,conventional detectors usually suffer from narrow bands.We present a method to design a high-speed shot-noise-limited balanced homodyne detector.A 300-MHz bandwidth detector is experimentally tested and the level of shot noise is 14 dB higher than the electronic noise.The results show that a detector with this method is potential to design a GHz bandwidth detector for continuous variable quantum key distribution at a low level of ratio of shot noise to electronic noise.

关 键 词：coherent quantum NARROW 

分 类 号：O41[理学—理论物理]