SNSPD自动化扫描测量系统

发布时间：2018-03-14 03:15

本文选题：SNSPD　切入点：自动化扫描测量系统　出处：《南京大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着量子通信、量子计算、量子成像以及一系列需要弱光检测技术的发展,性能优越的单光子探测器的需求越来越迫切。超导纳米线单光子探测器具有响应速度快、暗记数低、探测效率高、时间抖动小等一系列优点,受到业内广泛的关注。测量系统作为单光子探测实验的重要组成部分,对探测结果具有举足轻重的影。本文主要研究使用LabVIEW程序控制的SNSPD自动化扫描测量系统,通过编写成熟的LabVIEW控制程序,组织各个实验室用仪器有序工作,实现超导纳米线单光子测量系统的一键自动化运行,有效提高测量实验的工作效率。本文首先介绍了 SNSPD的原理及应用,总结传统测量系统存在的缺陷。然后介绍了实验中所使用的编程语言LabVIEW,以及使用LabVIEW控制实验室仪器的编程思路。接着详细介绍了自己搭建的SNSPD自动化扫描测量系统,以及系统中所用到的各个实验室仪器。我们使用自制的偏振测量模块,对扫描测量系统的偏振特性进行深入分析,通过改善偏振控制器等手段,对系统的偏振稳定性进行了一定程度的优化,为后续进一步优化系统的偏振稳定性提供建设性的建议。另外,我们还搭建了一种宽带微波信号的高速度远距离切换矩阵系统。该系统有效克服传统切换矩阵信号最大传输距离受限、损耗大等缺陷,且具有信号保真度高、工作模式多样化等优点,可实现信号切换、信号叠加等多种功能。
[Abstract]:With the development of quantum communication, quantum computation, quantum imaging and a series of low-light detection techniques, the demand of single-photon detectors with superior performance is becoming more and more urgent. A series of advantages, such as high detection efficiency, low time jitter and so on, have attracted wide attention in the industry. As an important part of the single photon detection experiment, the measurement system, This paper mainly studies the automatic scanning and measuring system of SNSPD controlled by LabVIEW program. By writing the mature LabVIEW control program, we organize the work of the instruments used in each laboratory in an orderly way. The single photon measurement system of superconducting nanowires can be operated automatically by one bond, and the efficiency of the measurement experiment can be improved. Firstly, the principle and application of SNSPD are introduced in this paper. This paper summarizes the defects of the traditional measurement system, then introduces the programming language LabVIEW used in the experiment, and the programming ideas of using LabVIEW to control the laboratory instruments. Then, it introduces in detail the SNSPD automatic scanning and measuring system built by itself. And the laboratory instruments used in the system. We use the self-made polarization measurement module to analyze the polarization characteristics of the scanning measurement system in depth, by improving the polarization controller and other means. The polarization stability of the system is optimized to a certain extent, which provides constructive suggestions for further optimizing the polarization stability of the system. We also set up a high speed and long distance switching matrix system for wideband microwave signal. The system effectively overcomes the limitation of the maximum transmission distance and the loss of the traditional switching matrix signal, and has high fidelity. It can realize signal switching, signal superposition and other functions.
【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN15

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