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Study on the Optical Monitoring Technology in Quantum Cryptography

Author: HuMin
Tutor: LiuSongHaoï¼›LiaoChangJun
School: South China Normal University
Course: Optics
Keywords: Quantum Key Distribution Optical power PIN photodiode Logarithmic amplifier USB interface PDIUSBD12
CLC: O413
Type: Master's thesis
Year: 2007
Downloads: 129
Quote: 1
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Abstract


With the rapid development of information and communication technology, information security and confidentiality of communications privacy, especially in military intelligence and state secrets is particularly prominent and important. Unlike traditional passwords, such as RSA and DES security of quantum key distribution system based on the principles of physics rather than mathematical complexity, is an absolutely safe communication. The theory of quantum key distribution, experimental research is an important part of the very popular in the field of quantum information research, and is the first commercial quantum information technology. In the conventional optical fiber communication system, for monitoring and measurement of the transmitted light is very important, and it relates to the problem of power equalization and channel interference. For fiber-based quantum cryptography system for strong attenuation of the light source of the laser pulse, the optical power monitoring is one of the important means to guarantee its security, the use of the means of monitoring and control can achieve a more stable the strong attenuation single photon source. This paper combines quantum key distribution system, and propose a practical optical power monitoring programs, and systems analysis of the composition and design of the measuring instrument. Divided into five chapters: Chapter 1: Introduction to the theoretical development and the basic principles of quantum cryptography, the key technology of fiber optic quantum cryptography system - single photon source, single-photon detectors. Chapter 2: basic principles of optical power measurement techniques detailed analysis, first introduced the characteristics of the photodetector photoelectric conversion and preamplifier circuit design, and then carry out specific research logarithmic amplifier and filter circuit , followed by a description of the man-machine interface of the SCM system circuit include button controls and LCD circuit design, and finally a detailed description of the software design of the entire system. Chapter 3: Analysis of optical power measurement system communication module, USB interface with a PC for data communication, data processing can take full advantage of the PC's powerful computing capabilities. Focuses on the basic principles of the USB protocol and PDIUSBD12 chip firmware programming. Chapter 4: Introduction to the precise control of the strong attenuation of a single photon source. Poisson distribution of single-photon source, and designed a very weak light pulse stability control device. Chapter 5: Summary and Outlook.

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