| Nonorthogonal Decoy-State Quantum Key Distribution |
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| 作者姓名： | 李靖波 方细明 |
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| 作者单位： | Department of Physics, Hunan Normal University, Changsha 410081 |
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| 基金项目： | Supported by the Scientific Research Fund of Hunan Provincial Education Department under Grant No 03c213. |
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| 摘 要： | In practical quantum key distribution （QKD）, weak coherent states as the photon source have a limit in the secure key rate and transmission distance because of the existence of multi-photon pulses and heavy loss in transmission line. The decoy-state method and the nonorthogonal encoding protocol are two important methods to combat these effects. Here, we combine both the methods and propose an efficient method that can substantially improve the performance of QKD. We find a 78-kin increase over the prior record using the decoy-state method and a 123-km increase over the result of the SARG04 protocol in transmission distance.
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| 关 键 词： | 量子键分布 光子源 多光子脉冲 传输线 非正交编码 |
| 收稿时间： | 2005-12-30 |
| 修稿时间： | 2005-12-30 |
Nonorthogonal Decoy-State Quantum Key Distribution |
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| LI Jing-Bo, FANG Xi-Ming.Nonorthogonal Decoy-State Quantum Key Distribution[J].Chinese Physics Letters,2006,23(4):775-778. |
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| Authors: | LI Jing-Bo FANG Xi-Ming |
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