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In classical physics, the detection of any physical quantity is accompanied by noise, including the classical noise of the system and quantum noise, which limits the detection accuracy. Among them, the classical noise mainly comes from technical defects, the advantages and disadvantages of instruments and other factors. With the development of science and technology, the classical noise of the system is greatly reduced and can often be ignored. Therefore, quantum noise determined by quantum mechanical properties gradually becomes the main source of noise. The squeezed light source has the quantum property that a certain orthogonal component can be lower than the shot noise limit, which breaks through the standard quantum noise limit and further improves the detection accuracy. As a kind of non-classical light, the squeezed state has great application potential in the field of quantum optics. Based on the stable working squeezed light prepared in the early stage, and combining with the theory, experiment and key technology of Professor Bi over 20 years, we have developed a set of instrumentized short-range quantum infrared detector. Special design is made in light source, detection system, pattern matching, phase locking, structure design and packaging, which can effectively improve detection accuracy and imaging quality in the range of 0.5m-9m, and then used in light source correction such as transverse displacement and tilt measurement of light beam and various detection under special conditions such as weak light.
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