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Research on Key Technology in Continuous Variable Quantum Key Distribution

Author: HeYunXian
Tutor: ZengGuiHua
School: Shanghai Jiaotong University
Course: Communication and Information System
Keywords: Continuous variables Quantum Key Distribution Phase modulator Amplitude modulator Gaussian modulation
CLC: O413
Type: Master's thesis
Year: 2010
Downloads: 89
Quote: 1
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Abstract


Based cryptography and quantum mechanics , the physics method of quantum cryptography , due to its security and eavesdropping detection , has a good safety performance and prospects . Continuous variable quantum password use of Gaussian states ( coherent state and compressed state ) as a signal carrier , using the light field of the the amplitude and is the phase as the signal carrier of the available observing physical quantities , amplitude modulation and phase modulation of the signal is loaded into the quantum carrier , in the detection end uses balanced homodyne detection system , as opposed to simple discrete variable quantum cryptography based on single-photon technology , equipment , high channel capacity . Therefore, the theory of continuous variable quantum cryptography , experimental research is of great significance . Theoretical research and technology to achieve our research is committed to continuous variable quantum cryptography , based on continuous variable quantum key distribution system has been initially developed , the paper briefly introduces the developed system , and then discussed in detail the continuous variable quantum key distribution several key technologies in the experiment : 1 . Gaussian source is a continuous variable quantum cryptography is an important part , it has close ties with the efficiency of the communication system , security and other core issues . Shannon's information theory model , this paper studies the Gaussian source channel capacity of quantum communication , quantum cryptography communication security analysis of the dependence of these important parameters of the Gaussian source parameters , and to determine the quantum secure communication system security conditions. On this basis the experimental realization of a Gaussian modulation , to utilize the FPGA successfully achieved a Gaussian continuous variable quantum signal modulation . 2 the phase modulator and the amplitude modulator is a continuous variable quantum key distribution indispensable light modulating device . The drive circuit and performance monitoring circuit is one of the key technologies of continuous variable quantum key distribution experiment . Firstly theoretically modulator performance analysis , followed by the to quantum security communication system hardware platform LiNbO3 phase modulator driver circuit and the performance test circuit is designed , and also given the performance monitoring of the amplitude modulator circuit experimentally verify the feasibility and reliability of the program .

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CLC: > Mathematical sciences and chemical > Physics > Theoretical Physics > Quantum theory
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