面向长距离量子通信的双光子关联成像技术

量子时域鬼成像利用光子对的时间-频率关联性实现了50km光纤链路上的图像传送,有望应用于量子通信的协议中。然而,现有方案的成像质量较差,成像速度较慢,因此其应用性在一定程度上受到了限制。文章对已有成像方案进行了较大的改进,利用可编程滤波器数字设定待成像信息,进而实现了二维图像信息的自动化实时传送。实验结果证明,改进方案的成像质量和速度均有显著改善,有利于推动量子关联成像在量子通信领域的应用。

Two-photon Correlation Imaging Technique towards Long-distance Quantum Communications

Quantum temporal ghost imaging utilizes the time-frequency correlation of photon pairs to realize the image transmission over optical fiber link of 50km, which shows the potential applications in protocols of quantum communications. But the present schemes usually present poor imaging quality poor and low transmission speed, limiting the future application to some extent. In this paper, the scheme is considerably modified and a programmable optical filter is used to digitally set the information of the imaging object. Based on the modification, the two-dimensional image is transmitted automatically in real-time. Experimental results demonstrate that both the imaging quality and rate are notably improved with the modified scheme, pushing the applications of quantum correlation imaging in the field of quantum communications.