Experimental And Anti-interference Of Quantum Imaging Based On Entangled Light

Nonlocal properties of quantum imaging have been attracting people for its research and detection. Compared to traditional Optical imaging, quantum imaging has huge advantages in terms of resolution and interference.These make it may have a large applications in the life science, defense and military fields.Quantum entanglement is an important manifestation of Quantum nonlocal property.When two particles are entangled,one particle's stage changing will lead to the other's instant change.The entangled double photon obtained by the spontaneous parametric down-conversion(SPDC) method,are highly entangled on momentum, polarization,and frequency.The first Quantum imaging experiment is completed with the entangled double photon.In this thesis, the theory and the experiments of quantum imaging with entangled two-photon source are studied.To suppress the bad influence of background noise and the interference,we propose an anti-interference method based on the double entangled photon.Later we simulate and make the experiment. The main research contents and innovations are as follows:1: Briefly review the history of finding quantum entanglement and producing method with the double entangled photon.After that we introduce the history of quantum imaging, and the research states of quantum imaging with the entangled photon.2: Make use pf the the spontaneous parametric down-conversion(SPDC) method to produce the entangled double photon. In the darkroom environment,the 457 nm beam is used to pump a nonlinear BBO crystal that is cut at a degenerate type?phase matching angle to produce pairs of orthogonally polarized signal and idler photons. We successfully prepare the entangled photon pairs and verifies its time and space correlation.3:Make use of the entangled double photon to complete the experiment of double slit quantum imaging.In our experiment one of the two entangled beams illumination a doule slit,after which there is a fixed single-photon detector.The other beam of the entangled beams scan and detect in one direction.finally by making the experiment of coincident measurement,we can get the image of the double slit.To have a better understanding of the experiment,we explain the principle of quantum imaging from the point of phenomenological and classical optics.4: Propose an anti-interference method based on the double entangled photon. First we analysis the princes of this method,also the factors that may affect imaging quality. On this basis, we propose the framework of this method and give its implementation steps. Then the anti-interference performance of this method is simulated and also these different factors that affect the imaging quality. The simulations show that the proposed method does have the ability of anti-interference. Also We have found that :1)the size of the combined pixel should be as equal as the coherent area of the entangled light.2)The large offset of the center of the symmetry,the worse the quality of the image;But the positioning problem of the center of the symmetry should be further stuied in future.