FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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A 300-MHz Bandwidth Balanced Homodyne Detector for Continuous Variable Quantum Key Distribution |
HUANG Duan, FANG Jian, WANG Chao, HUANG Peng**, ZENG Gui-Hua** |
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiaotong University, Shanghai 200240
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Cite this article: |
HUANG Duan, FANG Jian, WANG Chao et al 2013 Chin. Phys. Lett. 30 114209 |
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Abstract 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.
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Received: 02 July 2013
Published: 30 November 2013
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PACS: |
42.50.Dv
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(Quantum state engineering and measurements)
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03.67.Hk
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(Quantum communication)
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