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Paper Abstract and Keywords
Presentation 2013-05-27 10:30
On misconception of Koashi's key rate theory of quantum key distribution
Osamu Hirota (Tamagawa Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) It has been pointed out many times by Yuen that the security theory of quantum key distribution(QKD) originated by Shor-Preskill has a serious defect, among others that their key rate theory is not correct.
The security in the present theory is evaluated as failure probability
of protocol. So the theory ignores the concept of the security requirement as the secret key for symmetric cipher by such a generated key. In addition,they employ a wrong justification for own interpretation on the trace distance and its level. Consequently, they insist the unconditional security of own system when the level is 10^{-6} - 10^{-20}.
In this paper, we show the following results.The above numerical value of the level may provide a cipher that is weaker than conventional ciphers.
Thus, theories on key rate such as Koashi's rate theory has no meaning
in the design of practical cipher based on the present QKD.
Keyword (in Japanese) (See Japanese page) 
(in English) Quantum Key Distribution / Key rate / Shor-Preskill theory / NICT QKD system / / / /  
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Conference Information
Committee QIT  
Conference Date 2013-05-27 - 2013-05-28 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaido Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
Registration To QIT 
Conference Code 2013-05-QIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) On misconception of Koashi's key rate theory of quantum key distribution 
Sub Title (in English)  
Keyword(1) Quantum Key Distribution  
Keyword(2) Key rate  
Keyword(3) Shor-Preskill theory  
Keyword(4) NICT QKD system  
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1st Author's Name Osamu Hirota  
1st Author's Affiliation Tamagawa University (Tamagawa Univ.)
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Speaker Author-1 
Date Time 2013-05-27 10:30:00 
Presentation Time 20 minutes 
Registration for QIT 
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