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In order to accurately describe optical images, the quantum nature of light must be taken into account, even when the image is formed of a great number of photons. On the one hand, the inevitable quantum fluctuations of light degrade the quality of the image, but on the other hand, the possibility of creating strong quantum correlations or even entanglement between the different points open new possibilities...
In this paper, experimental evidence of cw amplification of images in the quantum regime, using a phase sensitive optical parametric amplification operating inside transverse degenerate cavities. Injecting various images (mismatched Gaussian modes and double slits of different orientations) at the input of the device, showed that the output image was amplitude squeezed by 30% in the regime of deamplification...
We consider the problem of extracting information from an optical image. The modes responsible for the quantum noise affecting the extraction are identified, which leads to a strategy optimizing the information read out
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