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Paper Abstract and Keywords
Presentation 2018-06-04 17:50
Performance improvement of RRDPS protocol by refined security analysis
Takaya Matsuura, Toshihiko Sasaki, Masato Koashi (UT)
Abstract (in Japanese) (See Japanese page) 
(in English) In recent years, quantum key distribution (QKD) protocols which use weak coherent pulses have been attracting much attention due to its ease of implementing the transmitter. Security analysis of this type of QKD protocols usually focuses on the pulses detected by the reciever and ignores the other pulses. Recently, however, it was found that the information on those undetected pulses is useful in security analysis and it leads to a tighter estimation of the amount of information leakage. Here, we apply this technique to the round-robin differential phase shift (RRDPS) protocol, which is one of the QKD protocols with weak coherent pulses and has a striking feature that the amount of information leakage is bounded without monitoring signal disturbance. We show that the key rate is significantly improved compared to that in the original analysis. The result mitigates difficulty of switching many delay lines, which is the main obstacle in implementing the RRDPS protocol.
Keyword (in Japanese) (See Japanese page) 
(in English) quantum cryptography / QKD / RRDPS / weak coherent pulse / complementarity / / /  
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Conference Information
Committee QIT  
Conference Date 2018-06-04 - 2018-06-05 
Place (in Japanese) (See Japanese page) 
Place (in English) ICCH Ran 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
Registration To QIT 
Conference Code 2018-06-QIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Performance improvement of RRDPS protocol by refined security analysis 
Sub Title (in English)  
Keyword(1) quantum cryptography  
Keyword(2) QKD  
Keyword(3) RRDPS  
Keyword(4) weak coherent pulse  
Keyword(5) complementarity  
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1st Author's Name Takaya Matsuura  
1st Author's Affiliation The University of Tokyo (UT)
2nd Author's Name Toshihiko Sasaki  
2nd Author's Affiliation The University of Tokyo (UT)
3rd Author's Name Masato Koashi  
3rd Author's Affiliation The University of Tokyo (UT)
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Speaker Author-1 
Date Time 2018-06-04 17:50:00 
Presentation Time 20 minutes 
Registration for QIT 
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