摘要
The security, efficiency, transmission distance and error rate are important parameters of a quantum key distribution scheme. In this article, the former two parameters are focused on. To reach high efficiency, an unsymmetrical quantum key distribution scheme that employs Greenberger-Horne-Zeilinger （GHZ） triplet states and dense coding mechanism is proposed, in which a GHZ triplet state can be used to share two bits of classical information. The proposed scheme can be employed in a noisy or lossy quantum channel. In addition, a general approach to security analysis against general individual attacks is presented.
The security, efficiency, transmission distance and error rate are important parameters of a quantum key distribution scheme. In this article, the former two parameters are focused on. To reach high efficiency, an unsymmetrical quantum key distribution scheme that employs Greenberger-Horne-Zeilinger （GHZ） triplet states and dense coding mechanism is proposed, in which a GHZ triplet state can be used to share two bits of classical information. The proposed scheme can be employed in a noisy or lossy quantum channel. In addition, a general approach to security analysis against general individual attacks is presented.
基金
supported by the National Natural Science Foundation of China(60773085,10647133)
the Natural Science Foundation of Jiangxi Province(2007GQS1906)
the Research Foundation of the Education Department of Jiangxi Province([2007]22)
the Key Project in the 11th Five-Year Plan on Education Science of Jiangxi Province(07ZD017)
the Innovation Project of Jiangxi Graduate Education(YC07A033)
the Scientific Research Starting Foundation for the Recruit Talent of Nanchang University of China
