Compressed Light Quantum Imaging Experiment Research

Quantum imaging light source has been studied In this paper,, analyzed theadvantage of using quadrature amplitude squeezed light as the light source of imaging,prepared and compressed nature of light detection, also designed by the orthogonalmodel mixing amplitude squeezed light generate squeezed light of the experimentalprogram of spaceand do the preliminary work related.Firstly，using diode-pumped all-solid-state continuous-wave Nd: YAG laser,and quasi-phase matched degenerate optical parametric amplifier based onperiodically poled KTiOPO4crystal, bright two-mode amplitude quadrature squeezedlight is obtained and the self-balanced homodyne probing method is demonstrated.Resolution test experiment is used to test the feasibility of our scheme. Theexperiments of resolution test are done with infrared squeezed light and infraredcoherent light individually under the same condition. The experimental resultsindicate that the resolution of active imaging with infrared squeezed light is higherthan that with infrared coherent light.Secondly, the theory of the multimode squeezed light is formulated, whichindicates that the multimode squeezed light is the mixing result of the coherent lightfilling the first base and the flipped modes of the vacuum squeezed light filling theother bases, which means that the multimode squeezed light can be achieved bymixing the particular modes. The bases mentioned above are orthonormal betweeneach other. The source of the quantum noise is analyzed in the difference detectionprocess by utilizing multimode light above. It is concluded that the main contributionto the quantum noise of each detection parametric variable originates from thefluctuation of the flipped mode corresponding to the variable. Therefore, the quantumnoise of the detection parametric variable can be reduced if the flipped mode is thequadrature amplitude squeezed light. On the basis of the theoretical representation,the experimental scheme for the generation of spacial squeezed light is given in which the key experimental devices are introduced detailedly.Finally, we improve upon the former locking-cavity system in the begin of theflat of Spacial squeezed light. The result of the experimentation indicates that thesystem improved is more locking，and the technology is easier than former to mastery...