Improvement of optical image by measurement reduction technique at parametric multiplexing. (arXiv:1812.02589v1 [quant-ph])

In the process of parametric optical image amplification, images are formed
at new frequencies in addition to the amplified original image. We show that
the parametric multiplexing of optical images can be used to produce an image
with improved quality. As an example, we study the parametric amplification of
an optical image at low-frequency pumping in which multiplexed optical images
turn out to be quantum-correlated. Additional improvement is made possible by
using the information about the object that is available to the researcher, in
particular, about sparsity of its image. To take the available information into
account, we apply the measurement reduction technique.

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