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Quantum key distribution system digital control module design

Author: WanXu
Tutor: WangJian
School: University of Science and Technology of China
Course: Physical Electronics
Keywords: Quantum communication Quantum key distribution Digital control module FPGA USB
CLC: O413
Type: Master's thesis
Year: 2010
Downloads: 93
Quote: 0
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Abstract


Quantum information is quantum physics and information science combined and developed new disciplines. Since the introduction of quantum mechanics, it has classical information unmatched advantages and prospects, has attracted widespread interest. Quantum information including quantum computing and quantum communication two fields. Quantum computing research object is applicable to quantum computers and quantum algorithms quantum computers. The main research quantum communication quantum cryptography, quantum teleportation, and to resolve long-distance quantum communication technologies. Quantum cryptography, also known as quantum key distribution, which uses quantum mechanics properties to ensure communication security. It enables communication between the parties to produce and share a random, secure key, to encrypt and decrypt information. In this paper, we focus on the field of quantum communication, quantum key distribution. Since 1984, Bennett and Brassard proposed the first quantum key distribution protocol has been based on a variety of different protocols, using different channels of quantum key distribution experiment has been completed. Decades, governments, research institutions, companies invest a lot of resources to the study of quantum cryptography, it gradually from the initial to the practical laboratory. China University of Science and Technology of Quantum Physics and Quantum Information Laboratory developed a quantum key distribution system is an attempt to practical use. In this thesis work, completed a quantum key distribution system digital control module circuit design, including FPGA-based control panel and synchronization acquisition delay boards. Control panel with powerful and flexible FPGA as the core, to achieve a variety of complex logic at the same time can be a good cost control. Control board and the host computer using the USB communication between the PC and through a custom backplane bus communication with other electronics module to complete the part of the control electronics. Synchronous acquisition board to complete the synchronization delay the reception of light screening, and screened for sync signal delay can be adjusted to provide for single-photon detector as a gate control signal. Screening the circuit board can be extracted synchronization signal 30mV, and subjected to the delay adjustment step 100ps, the delay range 200ns, the signal delay relative to synchronous optical shaking at 300ps. With digital control module circuit design, also completed a control board FPGA logic design. FPGA logic design logic including the sender, the receiver and the USB interface logic logical three-part, integrated in the same project, you can use the Mode Select command to select the appropriate part of the work. The sender, the logical main host computer PC command reception analysis, random number access, synchronization signal generation, laser and analog voltage board control and data encoding upload; On the receiving side, the logic mainly to complete PC PC command received the detector data acquisition and data encoding upload. In this thesis, the design and development of digital control module implements the entire system design requirements, operating normally, has reached a finished product, industrial requirements. Recently, based on existing commercial fiber and the development of quantum key distribution system, the research team in Hefei build the world's first all-pass type of quantum communication networks, to achieve a fully functional, and will gradually develop in the direction toward industrialization .

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