Sagnac环分时差分相位的量子编码调控

发布时间：2018-01-11 03:33

本文关键词：Sagnac环分时差分相位的量子编码调控　出处：《华东师范大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着信息时代的来临,信息安全问题越来越受到人们的重视,因为日常通信变得日益频繁,如何保障信息的绝对安全成为了一道难关。量子密钥分发(QKD)方案结合"一次一密"(OTP)加密算法协助人们一劳永逸地解决了这一问题,到目前为止,已经有许多量子编码的方案被提出,其中相位编码和偏振编码方案早就成为研究的热点。在本文中,我们提出了以Sagnac干涉环分时调制的方式完成相位编码和偏振编码的过程,并且以相对应的实验证明了这种调制模式的可行性。从理论分析和实验结果上可以得出,我们所提出的调制方式可以有效地完成量子编码,同时,能够克服之前方案中存在的不足。在相位编码的实验中,我们以Sagnac分时相位调制的方式,改进了即插即用式量子编码方式,克服了以前设计中对于工作频率的限制,获得了更好、更稳定的编码对比度。并且完成了在25km光纤中的100MHz量子编解码过程,得到了在12小时里稳定的20 kHz的原始码本,并且得出了其误码率(5%)。另外,我们将Sagnac分时相位调制的方式应用在偏振编码的方案中。分析了其以相位调制的方式实现偏振编码的原理,并且以实验的形式验证了 1.25 GHz基于Sagnac干涉环量子编码的可行性。该方案将偏振编码方案所需的光源固定为一个,可以有效避免针对不同光源特性的攻击。
[Abstract]:With the advent of the information age, people pay more and more attention to the problem of information security, because the daily communication becomes more and more frequent. How to ensure the absolute security of information has become a difficult problem. The quantum key distribution (QKD) scheme combined with the "one secret" OTP-based encryption algorithm helps people solve this problem once and for all. Up to now, many quantum coding schemes have been proposed, among which phase coding and polarization coding have long been the focus of research. We propose the implementation of phase coding and polarization coding by Sagnac interference loop time-sharing modulation. From the theoretical analysis and experimental results, it can be concluded that the proposed modulation scheme can effectively complete quantum coding, at the same time. In the experiment of phase coding, we use Sagnac time-sharing phase modulation to improve the plug and play quantum coding. It overcomes the limitation of working frequency in the previous design, obtains better and more stable coding contrast, and completes the 100MHz quantum coding and decoding process in 25km optical fiber. A stable 20 kHz source code book is obtained in 12 hours, and its error rate is obtained. We apply the method of Sagnac time-sharing phase modulation to the scheme of polarization coding, and analyze the principle of realizing polarization coding by phase modulation. The feasibility of 1. 25 GHz quantum coding based on Sagnac interference ring is verified by experiments. This scheme immobilizes the light source required by the polarization coding scheme as a single source. It can effectively avoid attacks against different light source characteristics.
【学位授予单位】：华东师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O413;TN918

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