基于FPGA的微波相干源线性检测和特性表征  

FPGA⁃based linear detection and characterization of microwavecoherent source

作　　者：王硕 潘佳政 魏兴雨 江俊良 张凯旋 李子硕 郭婷婷 许问渠 左权 周天石 盛怡凡 孙国柱 吴培亨 WANG Shuo;PAN Jiazheng;WEI Xingyu;JIANG Junliang;ZHANG Kaixuan;LI Zishuo;GUO Tingting;XU Wenqu;ZUO Quan;ZHOU Tianshi;SHENG Yifan;SUN Guozhu;WU Peiheng(Research Institute of Superconductor Electronics,School of Electronic Science and Engineering,Nanjing University,Nanjing 210023,China;Purple Mountain Laboratories,Nanjing 211111,China)

机构地区：[1]南京大学电子科学与工程学院超导电子学研究所,江苏南京210023 [2]紫金山实验室,江苏南京211111

出　　处：《量子电子学报》2023年第6期850-857,共8页Chinese Journal of Quantum Electronics

基　　金：国家重点研发计划(2016YFA0301801);南京大学登峰计划,江苏高校优势学科建设工程项目。

摘　　要：微波光子的检测和表征对于量子信息具有重要意义。通常使用Hanbury Brown-Twiss(HBT)干涉仪对光子源性质进行检测和表征,然而,由于微波光子信噪比较低,在对其进行检测和表征过程中常常需要多次计算才能移除噪声影响。本工作基于现场可编程门阵列(FPGA),提出一种快速、可扩展的测量方案用于分析微波光子源性质,可更快速地实现该计算过程。利用该方案对频率为3 MHz的相干源进行了模拟测量,分析了二阶相关函数所具有的特性,发现测量结果与理论具有良好的一致性。该系统的实现对未来进行单光子源检测具有重要意义。Detection and characterization of microwave photon sources is a key step in quantum information.For the optical photons,Hanbury Brown-Twiss interferometer can be used to measure the correlation of them.However,for microwave photons,as the signal-to-noise ratio of them is much lower than that of optical photons,multiple-calculation process is necessary for the elimination of noise influence.Here a new,fast and scalable measurement scheme is demonstrated to characterize a microwave photon source,in which real-time processing and full parallelism are realized by using field programmable gate array(FPGA).And the second-order correlation function of a coherent source with 3 MHz is investigated using the proposed scheme.The good agreement between the output of FPGA and that of the theoretical calculation indicates that,the scheme is promising for application in quantum information processing such as the characterization of microwave single-photon sources.

关 键 词：量子信息处理 微波光子源 相干源 相关函数 现场可编程门阵列 

分 类 号：O455[理学—无线电物理]