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Paper Abstract and Keywords
Presentation 2022-12-09 10:15
Finite-size security proof of binary-modulation continuous-variable quantum key distribution using only heterodyne measurement
Shinichiro Yamano (Univ. of Tokyo), Takaya Matsuura (RMIT Univ.), Yui Kuramochi (Kyushu Univ.), Toshihiko Sasaki, Masato Koashi (Univ. of Tokyo)
Abstract (in Japanese) (See Japanese page) 
(in English) Continuous-variable quantum key distribution (CV QKD) has many practical advantages including compatibility with current optical communication technology. Implementation using heterodyne measurements is particularly attractive since it eliminates the need for active phase locking of the remote pair of local oscillators, but the full security of CV QKD with discrete modulation was only proved for a protocol using homodyne measurements. Here we propose an all-heterodyne CV-QKD protocol with binary modulation and prove its security against general attacks in the finite-key regime. Although replacing a homodyne measurement with a heterodyne measurement would be naively expected to incur a 3 dB penalty in the rate-distance curve, our proof achieves a key rate with only a 1dB penalty.
Keyword (in Japanese) (See Japanese page) 
(in English) Quantum Cryptography / continuous variable quantum key distribution / heterodyne measurement / / / / /  
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Conference Information
Committee QIT  
Conference Date 2022-12-08 - 2022-12-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Keio Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
Registration To QIT 
Conference Code 2022-12-QIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Finite-size security proof of binary-modulation continuous-variable quantum key distribution using only heterodyne measurement 
Sub Title (in English)  
Keyword(1) Quantum Cryptography  
Keyword(2) continuous variable quantum key distribution  
Keyword(3) heterodyne measurement  
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1st Author's Name Shinichiro Yamano  
1st Author's Affiliation the University of Tokyo (Univ. of Tokyo)
2nd Author's Name Takaya Matsuura  
2nd Author's Affiliation RMIT University (RMIT Univ.)
3rd Author's Name Yui Kuramochi  
3rd Author's Affiliation Kyushu University (Kyushu Univ.)
4th Author's Name Toshihiko Sasaki  
4th Author's Affiliation the University of Tokyo (Univ. of Tokyo)
5th Author's Name Masato Koashi  
5th Author's Affiliation the University of Tokyo (Univ. of Tokyo)
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Speaker Author-1 
Date Time 2022-12-09 10:15:00 
Presentation Time 15 minutes 
Registration for QIT 
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