Wu Juan, Wang Fang-Xiang, Chen Wei, Wang Shuang, He De-Yong, Yin Zhen-Qiang, Guo Guang-Can, Han Zheng-Fu
Opt Lett. 2019 May 15;44(10):2522-2525. doi: 10.1364/OL.44.002522.
Ghost imaging (GI) can reconstruct the image of an object by measuring the correlation function of two beams, none of which carries the structure information of the object independently. This powerful technology makes it possible to obtain high-quality imaging of the object even in the presence of noise. Here, we introduce the GI method into quantum device evaluation in the time domain. We realized a proof-of-principle experiment to evaluate the temporal detection efficiency of a gated-mode single-photon avalanche detector (SPAD). The experimental results show that high-quality evaluation of temporal characteristics of the SPAD can be realized by the method of temporal GI (TGI). Our work indicates that the TGI method is an effective tool to monitor the temporal characteristics of quantum devices in real time and will bring a new perspective to the security evaluation of quantum communication.
鬼成像（GI）可以通过测量两束光的关联函数来重建物体的图像，其中任何一束光都不单独携带物体的结构信息。这项强大的技术使得即使在存在噪声的情况下也能够获得物体的高质量成像。在此，我们将GI方法引入时域量子器件评估中。我们实现了一个原理验证实验，以评估门控模式单光子雪崩探测器（SPAD）的时间探测效率。实验结果表明，通过时间鬼成像（TGI）方法可以实现对SPAD时间特性的高质量评估。我们的工作表明，TGI方法是实时监测量子器件时间特性的有效工具，并将为量子通信的安全性评估带来新的视角。
