Key Rate Available from Mismatched Measurements in the BB84 Protocol and the Uncertainty Principle
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概要
- 論文の詳細を見る
We consider the mismatched measurements in the BB84 quantum key distribution protocol, in which measuring bases are different from transmitting bases. We give a lower bound on the amount of a secret key that can be extracted from the mismatched measurements. Our lower bound shows that we can extract a secret key from the mismatched measurements with certain quantum channels, such as the channel over which the Hadamard matrix is applied to each qubit with high probability. Moreover, the entropic uncertainty principle implies that one cannot extract the secret key from both matched measurements and mismatched ones simultaneously, when we use the standard information reconciliation and privacy amplification procedure.
- （社）電子情報通信学会の論文
- 2008-10-01
著者
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WATANABE Shun
Department of Marine Bioscience, Ocean Research Institute, The University of Tokyo
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Watanabe Shun
Tokyo Inst. Technol. Tokyo Jpn
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MATSUMOTO Ryutaroh
Department of Communications and Integrated Systems, Tokyo Institute of Technology
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Watanabe Shun
Department Of Information Science And Intelligent Systems Tokushima University
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Matsumoto Ryutaroh
Department Of Communications And Integrated Systems Tokyo Institute Of Technology
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Watanabe Shun
Department Molecular Cell Signaling Tokyo Metropolitan Institute For Neuroscience
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