期刊
CHINESE PHYSICS LETTERS
卷 30, 期 11, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/30/11/114209
关键词
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资金
- National Natural Science Foundation of China [61170228]
- China Postdoctoral Science Foundation [2013M540365]
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 CHz bandwidth detector for continuous variable quantum key distribution at a low level of ratio of shot noise to electronic noise.
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