Low-overhead entangled light quantum target imaging method based on ranging assistance

Abstract

The invention provides a low-overhead entangled light quantum target imaging method based on ranging assistance. High-speed target imaging is realized through two coincidence counting operations. The method comprises the following steps: firstly, modulating pump light generated by a laser by using a lens combination and a wave plate combination, and improving the spontaneous parametric down-conversion efficiency of a periodically poled potassium titanyl phosphate (PPKTP) crystal; then, a digital micromirror device (DMD) is controlled to select a local ranging pixel area, and a time pulse difference value sequence about photons collected by the barrel detector and the surface detector is constructed; secondly, completing local coincidence counting by using the time pulse difference sequence to obtain a time difference between a signal light path and a reference light path; thirdly, the DMD is controlled to select a global imaging pixel area, the time pulse sequence obtained by the barrel detector is corrected, and the corrected time pulse sequence is utilized to complete global coincidence counting; and finally, mapping the coincidence count value and the gray value to obtain a quantum gray imaging result of the target.

Description

technical field [0001] The invention belongs to the technical field of quantum information, and is a technology for obtaining the distance and image information of a target by using entangled light, which can obtain the distance information of the target while imaging the target, and can effectively reduce the time overhead of quantum target imaging. Background technique [0002] At present, quantum technology represented by quantum information science is constantly forming new scientific frontiers, including quantum communication, quantum computing and quantum precision measurement. These revolutionary technologies will have a disruptive impact on traditional technologies. [0003] Quantum imaging in the field of quantum precision measurement has become a hot research direction due to its high resolution, strong anti-interference ability, and high confidentiality. Traditional geometric optical imaging is based on the point-to-point spatial correspondence between objects an...

AI Technical Summary

Problems solved by technology

However, at present, quantum imaging still has the problem of low imaging efficiency. Obtaining high-resolution quantum imaging results often requires a large time overhead, which greatly limits the practical application of quantum imaging.

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