Anti-interference quantum imaging apparatus and method of weakly absorbed target by sub shot noises

Abstract

The invention discloses an anti-interference quantum imaging apparatus and method of a weakly absorbed target by sub shot noises. According to the main thinking, a laser 1 generates a laser pulse and the laser pulse passes through a telescope 2, a half wave plate 3, a BBO crystal 4 successively to generate a signal beam and an idle beam; the idle beam passes through a high-pass totally-reflecting mirror 5, a lens 6, a first orthogonal polarization selection plate 7 and a narrow-band filtering plate 9 to obtain a useful signal beam passing through the narrow-band filtering plate 9; and the idle beam passes through the high-pass totally-reflecting mirror 5, the lens 6, a second orthogonal polarization selection plate 8 and a narrow-band filter mirror 10 to obtain a useful idle beam passing through the narrow-band filter mirror 10. A charge coupling device 12 detects the useful signal beam passing through a to-be-image target 11 and the useful idle beam passing through the narrow-band filter mirror 10 respectively to obtain an effective signal beam and an effective idle beam; and a signal processing module 13 obtains an quantum imaging result of the to-be-image target 11 according to the effective signal beam and the effective idle beam.

Description

technical field [0001] The invention belongs to the technical field of quantum imaging, in particular to an anti-interference sub-shot noise weak absorption target quantum imaging device and imaging method, which is suitable for enhancing the anti-interference ability of the sub-shot noise weak absorption target quantum imaging method. Background technique [0002] Quantum imaging, also known as two-photon correlation imaging, intensity correlation imaging and ghost imaging, is a new type of imaging technology developed by using the phenomenon of quantum entanglement. As a new imaging technology, the realization of entangled light source ghost imaging in quantum imaging makes it possible to transmit the object image information in one of the two independent spaces, so as to realize correlated imaging. Thermal light sources can also be used for correlative imaging. Compared with classical imaging, quantum imaging has the following advantages: 1) Super-resolution imaging in q...

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Problems solved by technology

However, this scheme requires that even under the condition of strong background noise, the sub-shot noise at the symmetrical position of the far-field light field of the two branches of the imaging optical path must be spatially correlated. However, it is difficult for real quantum imaging experiments to meet this requirement.

[0004] Giorgio Brida's document "Experimentalquantumimagingexploitingmultimodespatialcorrelationoftwinbeams" introduced the experiment of using the spatial correlation characteristics of sub-shot noise to perform quantum imaging on weakly absorbing targets, that is, using the spatial correlation characteristics of the symmetrical positions of the signal beam and the idle beam generated by the parametric down-conversion process to achieve Quantum imaging of weakly absorbing targets; the problem with this method is that when there is interference in the imaging background, using this method to image objects will produce very large errors

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