Study On Correlated Imaging Schemes Based On High Order Difference Sifted Reconstruction Algorithm And Angular Position Entanglement

The correlated imaging, is also called ghost imaging, could offer a great potentiality withrespect to conventional imaging for obtaining the imagings of objects which are located in opticallyharsh or noisy environment. It can solve the problems which are difficult with conventional imagingtechniques. Recently, it has become one of the hot topics in quantum optics. The research ofcorrespondence correlated imaging scheme and quantum correlated imaging scheme based on theentanglement of angular position in this thesis are theoretical important and valuable.In the thesis, a difference sifted reconstruction algorithm for correspondence correlatedimaging scheme was first proposed. The mean of the difference between idle optical measurementsand signal optical measurements was used as the sifted threshold in the correspondence correlatedimaging scheme for image reconstruction. Furthermore, a small amount of data preprocessing to getthe the sifted threshold was obtained to save time. Based on it, a small amount of data preprocessingdifference correspondence correlated imaging scheme with compressive sensing techniques wasproposed. The numerical simulations showed that the number of samples were greatly reduced forthe images under the same images quality with the novel correlated imaging scheme, and thequalities were better with the increase of the number of samples.Next, a high order difference sifted correspondence correlated imaging scheme was proposedto improve the visibility of correlated imaging. The numerical result showed that the visibility wasimproved against the number of order and the visibility could be close to1when the order was largeenough. Meanwhile, the improved visibility was the cost of the images quality. The PeakSignal-to-Noise rate of the recovered image by the proposed correlated imaging scheme wasreduced by26.3%when the number of order increased from2to9.Finally, a quantum correlated imaging scheme based on the entanglement of angular positionwas proposed. In this scheme, a fan-shaped phase with angle was loaded in the signal opticalpath with LG(-1) mode. The fan-shaped phase was composed of the PI phase in fan area and0phase in others. The light with LG(1) mode was loaded in the idle optical path. The results showedthat different coincidence counting were produced when the fan-shaped phase was setup to differentangles. That could be useful for distinguishing different gray values in multiple gray correlatedimaging scheme. The feasibility of the correlated imaging scheme based on angular positionentanglement was proved by numerical simulations with2gray,4gray and8gray image.