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Paper Abstract and Keywords
Presentation 2019-05-20 13:20
[Poster Presentation] Reduction of size and excess noise of continuous-variable quantum key distribution system using single-path interferometer
Shinya Hirashita, Kento Kitamura, Takuya Hirano (Gakushuin Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) It is necessary to reduce excess noise in order to realize continuous quantum key distribution (CV- QKD) in a channel with a large optical loss. The purpose of this research is to reduce excess noise of continuous quantum key distribution system using a single optical-path interferometer where the signal light and local oscillator light always travel the same optical path. In the single optical-path configuration, it is expected that the change in the relative phase between the signal light and the local oscillation light is small even if there exists mechanical vibrations, and the configuration is suitable for a long distance or free space quantum channel. In this paper, we report the simplification of the optical system and improvement of the polarization extinction ratio which is an important parameter for reducing the excess noise of the single optical path configuration. By simplifying the optical system we could reduce the size of the transmitter and receiver. Using this system, quantum key distribution was performed over a 40 km optical fiber.
Keyword (in Japanese) (See Japanese page) 
(in English) continuous-variables quantum key distribution / excess noise / small size / / / / /  
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Conference Information
Committee QIT  
Conference Date 2019-05-20 - 2019-05-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyushu University, Chikushi Campus 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
Registration To QIT 
Conference Code 2019-05-QIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Reduction of size and excess noise of continuous-variable quantum key distribution system using single-path interferometer 
Sub Title (in English)  
Keyword(1) continuous-variables quantum key distribution  
Keyword(2) excess noise  
Keyword(3) small size  
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1st Author's Name Shinya Hirashita  
1st Author's Affiliation Gakushuin University (Gakushuin Univ.)
2nd Author's Name Kento Kitamura  
2nd Author's Affiliation Gakushuin University (Gakushuin Univ.)
3rd Author's Name Takuya Hirano  
3rd Author's Affiliation Gakushuin University (Gakushuin Univ.)
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Speaker Author-1 
Date Time 2019-05-20 13:20:00 
Presentation Time 90 minutes 
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