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A 300-MHz Bandwidth Balanced Homodyne Detector for Continuous Variable Quantum Key Distribution 被引量:7

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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.
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)
出处 《Chinese Physics Letters》 SCIE CAS CSCD 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.
关键词 coherent quantum NARROW
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