Wang Dong, Li Mo, Guo Guang-Can, Wang Qin
Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003, China.
Key Lab of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education, Nanjing 210003, China.
Sci Rep. 2015 Oct 14;5:15130. doi: 10.1038/srep15130.
Quantum key distribution involving decoy-states is a significant application of quantum information. By using three-intensity decoy-states of single-photon-added coherent sources, we propose a practically realizable scheme on quantum key distribution which approaches very closely the ideal asymptotic case of an infinite number of decoy-states. We make a comparative study between this scheme and two other existing ones, i.e., two-intensity decoy-states with single-photon-added coherent sources, and three-intensity decoy-states with weak coherent sources. Through numerical analysis, we demonstrate the advantages of our scheme in secure transmission distance and the final key generation rate.
涉及诱骗态的量子密钥分发是量子信息的一项重要应用。通过使用单光子加相干源的三强度诱骗态，我们提出了一种在量子密钥分发方面切实可行的方案，该方案非常接近无限数量诱骗态的理想渐近情况。我们对该方案与另外两种现有方案进行了比较研究，即单光子加相干源的双强度诱骗态和弱相干源的三强度诱骗态。通过数值分析，我们证明了我们方案在安全传输距离和最终密钥生成率方面的优势。
