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Paper Abstract and Keywords
Presentation 2014-05-12 16:30
Problem with Interpretation of Trace Distance as Failure Probability in Quantum Key Distribution
Takehisa Iwakoshi, Osamu Hirota (Tamagawa Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) Quantum Key Distribution (QKD) has been attracting attention as an important technique to share an information-theoretically secure key under the existence of an eavesdropper. However, a security claim has been made repeatedly since 2009 that trace distance, a security parameter in QKD, is not interpreted correctly. The interpretation states that trace distance between a distributed quantum state and an ideal quantum state gives a probability that the distributed state is not ideal. However, the interpretation may be based on misuse of coupling theorem. Therefore, this study simulated by a physical random number generator whether the probability can be given by the trace distance. The result showed that the interpretation was wrong. Thus, to evaluate the security of QKD, it is required to give a new interpretation of trace distance and the failure probability of QKD.
Keyword (in Japanese) (See Japanese page) 
(in English) Quantum Key Distribution / Security proof / Trace Distance / Coupling Theorem / Failure probability / / /  
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Conference Information
Committee QIT  
Conference Date 2014-05-12 - 2014-05-13 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
Registration To QIT 
Conference Code 2014-05-QIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Problem with Interpretation of Trace Distance as Failure Probability in Quantum Key Distribution 
Sub Title (in English)  
Keyword(1) Quantum Key Distribution  
Keyword(2) Security proof  
Keyword(3) Trace Distance  
Keyword(4) Coupling Theorem  
Keyword(5) Failure probability  
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1st Author's Name Takehisa Iwakoshi  
1st Author's Affiliation Tamagwa University (Tamagawa Univ.)
2nd Author's Name Osamu Hirota  
2nd Author's Affiliation Tamagwa University (Tamagawa Univ.)
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Speaker Author-1 
Date Time 2014-05-12 16:30:00 
Presentation Time 20 minutes 
Registration for QIT 
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