Robust Ghost Imaging Based on Degenerate Spontaneous Parametric Down-Conversion

• Published in: Chinese physics letters Vol. 34; no. 5; pp. 68 - 71
• Main Author: 孔令军 司宇 刘瑞 王周祥 齐文荣 涂成厚 李勇男 王慧田
• Format: Journal Article
• Language: English
• Published: 01.05.2017
• Subjects: 信号路径; 实验方案; 成像质量; 简并; 纠缠光子对; 自发参量下转换; 非线性晶体; 鲁棒性
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/34/5/054206

In traditional ghost imaging, the entangled photon pairs produced from the spontaneous parametric down conversion （SPDC） process are used. There is an intrinsic disadvantage that the utilization efficiency of the photon pairs is very low. Inasmuch as all the correlated photon pairs produced by the degenerate SPDC process can be used to record the image of an object, the ghost imaging scheme we present here has a higher utilization efficiency of the photon pairs. We also investigate the robustness of our experimental scheme. The experimental results show that, no matter whether the photon-pair source is two light cones or two beam-like spots, the clear image of the object can be obtained. The slight rotation of the nonlinear crystal has no influence on the imaging quality. Our experimental results also demonstrate that when the part of the photon-pair source in the signal path or the idler path is blocked by unwanted things, the clear ghost image of the object can still be recorded.