Quantum imaging device and method of entangled photon pair time and position synchronization coincidence

Abstract

The invention relates to a quantum imaging device and method of entangled photon pair time and position synchronization coincidence. The device comprises an entangled source, a shading screen, a signal photon position measurement branch and an idle photon position measurement branch. The signal photon position measurement branch comprises an imaging lens, a first optical filter, a resolution plateand a first detector which are successively arranged. The first detector is connected to a signal photon position measurement module. The idle photon position measurement branch comprises a second optical filter and a second detector which are successively arranged. The second detector is connected to an idle photon position measurement module. The first detector and the second detector are connected to a time coincidence module. The signal photon position measurement module and the idle photon position measurement module are connected to the time coincidence module and a space coincidence module. The space coincidence module is connected to a photon counting image synthesis module. In the invention, photon collection efficiency is increased and imaging time is shortened.

Description

technical field [0001] The invention relates to the technical field of quantum imaging, in particular to a quantum imaging device and method for synchronous coincidence of time and position of entangled photons. Background technique [0002] Spontaneous parametric down-converted quantum imaging technology is a new type of imaging technology that uses entangled photons obtained by spontaneous parametric down-conversion to detect highly correlated characteristics, thereby recovering the spatial information of the object to be measured. It is not limited by the classic Rayleigh scattering limit, breaks through the classic imaging limit, improves the imaging quality and visibility, and has broad application prospects in microscopic imaging, military radar and space detection. [0003] At present, the time coincidence measurement of entangled photon pairs is realized by point detector plus scanning method in quantum imaging system. Since the generation efficiency of spontaneous ...

AI Technical Summary

Problems solved by technology

This leads to the serious interference of stray light (background light and pump light for spontaneous parametric down-conversion, etc.) on the signal light during the detection process.

Although the addition of filters in front of the detector can reduce the influence of stray light, the interference of stray light with the same wavelength on the imaging system cannot be eliminated

In addition, in current spontaneous parametric down-conversion quantum imaging systems, single-point single-photon detectors are mostly used for scanning detection in idle optical paths, which can only detect entangled photon pairs at the scanning point, while omitting a large number of entangled photon pairs passing through other places, greatly reducing photon collection efficiency

Due to problems such as low photon collection efficiency and stray light interference, the spatial resolution of point detector plus scanning imaging is not high, and the imaging time is long

[0004] The invention proposes a quantum imaging device and method in which entangled photons coincide with time and position synchronously, which not only overcomes the shortcomings of the current quantum imaging system, such as low photon collection efficiency and long imaging time, but also improves the imaging resolution

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