【作者】 程磊；

【导师】 曾贵华；

【作者基本信息】 上海交通大学 ， 通信与信息系统， 2010， 硕士

【摘要】 由于量子不可克隆定理和海森堡测不准原理保证了量子密码的无条件安全性和对监听的可检测性,量子密码已经成为最具吸引力的前沿领域。量子密钥分发作为量子密码学的研究重点,各国学者在理论以及实验方面都作出了令人瞩目的成就。经过不断探索,学者们发现由于离散变量量子密钥分发所依赖的单光子产生、检测在技术上存在限制,其通信的速率比较低。而使用相干光技术的连续变量量子密钥分发技术难度较低,并且试验证实可以获得较高的通信速率,因此连续变量量子密钥分发受到越来越多的关注。为了提供量子通信过程中的控制功能,人们已经提出并实现了多种电路解决方案。但是这些方案无论在精确度以及功能上都存在各种缺陷,无法满足现有通信方案的要求。而且随着嵌入式技术和可编程技术的发展,人们希望有一种通用的、功能强大的电路设计,可以提供更加精确的电路控制,具备更加强大的软件处理能力,在此基础上希望系统可以脱离PC工作,整个控制系统更加便携,更容易进行资源的重新利用。为了实现一种高度集成、资源可重用并且具有强大软件处理功能的电路系统,论文基于Xilinx FPGA开发板,利用SOPC技术进行精确时钟控制的IP模块开发以及控制系统的软硬件协同,完成了连续变量量子密钥分发的电路设计。论文随后完成了基于ML405的嵌入式Linux系统移植,实现了软硬件的无缝协同设计,为后续的通信算法软件实现提供了友好、便捷的开发环境。最终论文在此Linux环境下实现了连续变量量子密钥分发的自适应协商算法编程,根据所完成算法得出的数据验证了自适应区间划分算法的有效性。更多还原

【Abstract】 Since quantum no-cloning and the Heisenberg uncertainty relation ensure the absolute security and the ability of detecting eavesdropper, quantum cryptography has become the most attractive frontiers in recent years. Quantum Key Distribution (QKD), as the most emphasized research field, has bred remarkable fruition both theatrically and experimentally. After continuous exploitation, scholars found that the technology of photon generation and detection, which the discrete variable quantum key distribution relies on, limited the speed of communication, while at the same time, continuous quantum key distribution which uses coherent light is much easier to realize, and its high speed of communication has been experimentally proved. Therefore, continuous quantum key distribution attracts more and more attention.In order to provide control function for quantum communication, some electrical solution has already been proposed and many of them have been experimentally realized. However, these solutions could not satisfy system demands on precision and function in present communication schemes. Besides, with the fast development of embedded technology and programming techniques, people are looking for a more universal and powerful solution, with more precise timing and powerful software processing ability, greater portability and convenience to reuse all the resources, higher integration of software and hardware and also the ability to work without a PC.For the purpose of realizing a reusable electrical solution with powerful software processing ability and higher integration intensity, this thesis, based on Xilinx FPGA platform, realizes a synchronous timing IP core with precise clock output for the continuous variable quantum key distribution scheme using SOPC techniques. The ML405 based Linux porting is also accomplished and the seamless integration of software and hardware is realized, providing a user-friendly and convenient development environment for the following realization of reconciliation and other QKD related algorithms. Finally, the thesis finishes the programming of auto-adaptive interval selection algorithm for continuous quantum key distribution under embedded Linux. After analyzing a large amount of data experimentally, the validity of the algorithm is proved.更多还原