基于双步符合计数的纠缠光量子成像方法  

Entangled Optical Quantum Imaging Method Based on Two-Step Coincidence Counting

作　　者：周牧 嵇长银 王勇 曹静阳[1,2] Zhou Mu;Ji Changyin;Wang Yong;Cao Jingyang(School of Communications and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Engineering Research Center of Mobile Communications,Ministry of Education,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]移动通信教育部工程研究中心,重庆400065

出　　处：《光学学报》2023年第20期270-280,共11页Acta Optica Sinica

基　　金：国家自然科学基金(62101085);重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX0895);重庆市教委科学技术研究项目(KJZD-K202000605);重庆市技术创新与应用发展专项(S2022-02N);重庆市研究生科研创新项目(CYS21298,CYB22248)。

摘　　要：为了提高纠缠光量子成像效率,本文采用双步符合计数法快速获取目标成像信息,降低纠缠光量子成像的时间开销。首先,利用透镜和波片组合对激光器产生的泵浦光进行调制,提高周期极化磷酸氧钛钾(PPKTP)晶体自发参量下转换的效率;然后,通过数字微镜器件(DMD)选取测距区域,构造单光子时间脉冲序列差值;其次,利用该差值完成局部符合计数以得到信号和参考光路的延时差;再次,通过控制DMD选取成像区域,对单光子时间脉冲序列进行修正,并利用修正后的序列完成全局符合计数;最后,将符合计数值与灰度值进行映射,得到目标的量子图像。此外,通过与经典量子成像结果相比较,分析了目标距离、测距区域大小和单像素曝光时间对成像结果的影响,同时搭建了实际的量子成像光路以验证本文方法的有效性。Objective Classical optical imaging requires that the light source,object,imaging lens,and imaging plane are in a collinear position,and the first-order correlation property of the light field is employed to obtain the object information for imaging.Different from classical optical imaging,quantum imaging divides the imaging optical path into the signal optical path and the reference optical path and separates the process into the detection process and imaging process,which can complete imaging in the case that classical optical imaging cannot be achieved.As an important development field of quantum information science,quantum precision measurement studies how to utilize quantum effects to measure physical quantities.Compared with traditional measurement techniques,quantum precision measurement has more advantages in measurement accuracy,sensitivity,and security.In the medical and aerospace fields,it has caught widespread attention in China and abroad,with great development potential.Although quantum imaging is based on photon arrival time series received on signal and reference optical paths for coincidence measurement or intensity correlation to achieve imaging,with strong anti-interference ability compared with classical optical imaging,there are still some problems.In the reference optical path,it is necessary to adopt digital micromirror device(DMD)for two-dimensional spatial scanning to obtain spatial information.Pixel-by-pixel scanning is required to obtain accurate coincidence values,which limits imaging efficiency.To improve the efficiency of entangled optical quantum imaging,our study adopts the two-step coincidence counting method to quickly obtain target imaging information and reduce the time overhead of entangled optical quantum imaging.Methods First,the pump light generated by the laser is modulated by the combination of the lens and wave plate to improve the efficiency of spontaneous parametric down-conversion of the periodically poled KTiOPO4(PPKTP)crystal.Second,the ranging region is selected by

关 键 词：量子纠缠 量子成像 符合计数 数字微镜器件 成像效率 

分 类 号：TN92[电子电信—通信与信息系统]