基于高斯调制的连续变量量子通信的研究

发布时间：2018-01-08 18:35

本文关键词：基于高斯调制的连续变量量子通信的研究　出处：《天津工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：量子通信理论是量子信息学的核心内容之一。它的出现为信息的安全传输开辟了一种全新的思路,为密码科学和通信科学带来了新的活力。自BB84协议被提出以来,无论是离散变量还是连续变量的量子通信,在理论和实验上都取得了许多的重要的研究成果。同时这些成果显示出了量子通信的巨大的应用前景和商业价值,吸引了世界各国政府投入了大量人力资源进行进一步的研究。虽然连续变量量子通信技术相比于离散变量量子通信技术来说出现较晚,但它却具有很明显的后发优势。其利用经典光源,如用相干光作为信号源,具有实现成本低,并且容易集成等优点。本文详细阐述了高斯调制的连续变量量子通信过程,对其中的安全密钥产生率进行了详细的研究,并对该通信方案下的安全性进行了深入的分析和讨论。主要研究内容有以下两个方面:(1)阐述了对称配置下的连续变量量子通信过程的方案相比较一般的通信方案具有一定的优势。基于测量设备无关来提高Alice和Bob之间的互信息量。随后,利用相关的测量理论和量子信息论得出基于纠缠表象下的理论安全密钥产生率。同时结合量子态的协方差矩阵的表征方法,详细说明了通信双方以及窃听者经过测量前后所得到的条件协方差矩阵的推导过程。并利用矩阵的辛本征值与Von Neumann熵的关系最终计算得出连续变量量子安全密钥产生率的理论表达式。(2)针对对称配置下的连续变量量子通信系统进行了安全性分析。根据关联参数与物理环境之间的关系对攻击类型进行适当地分类,通过数值模拟的方法得出最佳的攻击方法,并给出最佳攻击方法下的安全密钥产生率。然后,对安全密钥产生率的进行了深入地分析,将探测器的探测效率考虑进来,用两个分束器来对探测器的效率进行模拟。最终得出在对称配置的条件下,探测器的效率不为1条件下的双模高斯攻击下的安全密钥产生率。
[Abstract]:The theory of quantum communication is one of the core content of quantum information science. It appears safe transmission of information opens up a new method, has brought new vitality to the password science and communication science. Since the BB84 protocol is presented, both discrete variables or continuous variable quantum communication, the important research results many have been made in theory and experiment. At the same time, these results show that the quantum communication has great application prospect and commercial value, attracted the attention of governments around the world have invested a lot of human resources for further research. Although the continuous variable quantum communication technology compared to the discrete variable quantum communication technology appeared relatively late, but it has the obvious advantage of backwardness. The classical sources, such as the use of coherent light as the signal source, has low cost and easy integration, etc. This paper expounds high Continuous variable quantum communication, modulation rate, have carried out a detailed study of the security key, and security of the communication scheme are analyzed and discussed in detail. The main research contents include the following two aspects: (1) describes the configuration of the symmetric communication scheme of continuous variable quantum communication the scheme is more general has certain advantages. Based on independent measurement equipment to improve the mutual information between Alice and Bob. Then, using the measurement theory and related theory of quantum information is obtained under the representation theory of the rate of safety entanglement key. Based on the characterization method combined with the covariance matrix of quantum states, a detailed description of the derivation of the conditional covariance matrix obtained by both sides of communication and the eavesdropper through measurement before and after. And by using the symplectic eigen matrix relation between Von value and Neumann entropy calculated the end. Continuous variable quantum secure key generation theory expression rate. (2) for continuous variable quantum communication system under the symmetric configuration was analyzed. Proper classification of attack types according to the relationship between the related parameters and the physical environment, the best attack method is obtained through numerical simulation method, and gives the best security key attack the method of generating rate. Then, the secure key generation rate is analyzed, the detection efficiency of the detector into account, using two beam splitter to the efficiency of the detector is simulated. Finally the symmetrical configuration under the condition that the detector efficiency for security key Gauss 1 attack mode under the production rate.

【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O413;TN918

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