Compressed-sensing-based entangled light imaging device and imaging method against background of strong interference

Abstract

The invention discloses a compressed-sensing-based entangled light imaging method against the background of strong interference. According to the technical scheme, a laser 1 generates laser; spontaneous parametric down conversion is carried out on the laser by a BBO crystal 2 to obtain signal light and idle light; the signal light passes through a to-be-imaged object 3 and a first single-photon detector 6 successively to obtain signal light passing through the first single-photon detector 6; a lens 4 collects the idle light to obtained collected idle light and sends the collected idle light to a spatial light modulator5; the spatial light modulator 5 carries out amplitude modulation on the collected idle light and then the modulated light passes through a second single-photon detector7; the light is sent to a coincidence counter 8; the coincidence counter 8 records coincidence counting of the signal light passing through the first single-photon detector 6 and the idle light passing through the second single-photon detector7 to obtain a measurement matrix and a coincidence counting column vector; and a data processing module 9 obtains an imaging result of the to-be-imaged object 3 based on the measurement matrix and the coincidence counting column vector.

Description

technical field [0001] The invention belongs to the technical field of quantum radar, in particular to an entangled light imaging device and imaging method based on compressed sensing in a strong interference background, which is suitable for quantum imaging in a strong interference background. Background technique [0002] Quantum imaging is a new type of imaging technology developed by using the phenomenon of quantum entanglement. It can also be called two-photon correlation imaging, intensity correlation imaging and ghost imaging. As a new imaging technology, quantum imaging, that is, the realization of entangled light source ghost imaging in ghost imaging, can make it possible to transmit object image information in one of the two independent spaces; thermal light sources can also achieve intensity correlation Imaging, that is, quantum imaging. Compared with classical imaging, quantum imaging has the following advantages: 1) Super-resolution imaging of quantum imaging—t...

AI Technical Summary

Problems solved by technology

[0005] In the literature "Entangled-photoncompressiveghostimaging", PetrosZerom et al. propose to use entangled photon pairs generated by parametric down-conversion as a light source, and obtain the imaging results of the original signal according to the coincidence counts generated by the light source and the random pattern reconstruction of the spatial light modulator (SLM) , and can effectively reduce the number of measurements required to reconstruct random patterns; in addition, under the premise of a given reconstruction quantum ghost imaging mean square error, the number of entangled photon pairs required by compressed sensing is much smaller than that required by scanning methods number; in summary, this method not only reduces the time required to obtain the imaging results of the original signal, but also is more economical; lead to biased coincidence counts, and can also cause performance degradation or instability in imaging results

Images