光纖量子通信網(wǎng)絡(luò)中的多址技術(shù)及單光子波長(zhǎng)變換研究
[Abstract]:Quantum key distribution is based on the fundamental principles of quantum mechanics. It applies the Heisenberg uncertainty principle and the non-cloning of unknown quantum states, and has unconditional security. Therefore, it has become a hot spot in the field of cryptography and quantum physics at home and abroad. From birth to now, quantum key distribution has developed from laboratory research to small scale metropolitan area network of dozens of users, and is moving from man to wide-area network on a larger scale. Even the development of quantum communication networks on a global scale. Therefore, it is very important to study the multiple access technology in quantum communication networks. This paper focuses on multiple access technology, including multiple access technology in quantum communication networks and single-photon wavelength conversion technology in wavelength division multiple access (WDM). Firstly, the research and development of multiuser quantum communication are introduced, and the significance of studying multiple access technology and single photon wavelength conversion in quantum communication network is expounded. Secondly, the theoretical knowledge of multiuser quantum communication technology is described, including the basic structure of quantum key distribution network from the aspects of function and protocol, quantum bits, several common quantum states, The principle of uncertainty, the noncloning of unknown quantum states, the quantization of light field, the preparation and detection technology of single photon signal, the quantum communication protocol based on single photon signal are introduced. Including BB84 protocol, weak coherent optical decoy state protocol. Thirdly, referring to the multiple access mode in classical communication, the feasible multiple access technology in quantum communication network is studied, the model of multiple access network is constructed, and the quantum key generation rate is analyzed and compared. The results show that the quantum key distribution network based on TDMA (Time Division Multiple Access) can provide a non-interference and efficient quantum key distribution service, and that the quantum key distribution network based on CDMA (Code Division Multiple Access) can achieve its best performance only at code replay 1. An improved method based on LBS (Listen Before Send) algorithm is proposed for quantum key distribution network based on CDMA, and the parameter of wavelength is introduced into the model of TDMA network, which is combined with WDM (Wavelength Division Multiplexing) technology. Furthermore, a WDM-TDMA hybrid network model supporting large capacity and multiple users is constructed, and its key generation rate is analyzed. Fourthly, the single photon wavelength conversion technique in wavelength division multiple access (WDM) is studied for the blocking problem caused by quantum information exchange between subnetworks in quantum communication networks. The possibility of quantum state complete transfer in the process of Four-Wave mixing (FWM) and differential (Difference Frequency Generation, shorthand (DFG) is proved, and the condition of realizing the complete conversion of single photon wavelength is also proved. An experimental scheme of single photon wavelength secondary conversion based on FWM and DFG cascade is proposed and analyzed. Finally, the paper summarizes the full text and prospects the future work.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TN929.11;TN918.4
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