  Two twin beams with a shared signal beam and separated idler beams are used
together with the photon-number-resolving postselection in the signal beam to
arrive at two coupled beams with anticorrelations in photon-number
fluctuations. Moreover, the beams exhibit the sub-Poissonian photon-number
statistics in their marginal distributions under suitable conditions. The
postselected fields with the increasing mean photon numbers are reconstructed
from the experimental photocount histograms by the maximum likelihood approach.
Also a suitable Gaussian fit of both original twin beams and simulation of the
postselection process are applied to arrive at the corresponding photon-number
distributions. Their nonclassical properties are analyzed by suitable
nonclassicality criteria and quantified by the corresponding nonclassicality
depths. Determining the appropriate quasi-distributions of integrated
intensities with negative values, the performance of different nonclassicality
criteria is judged. Properties of the postselected fields reached both by the
used and ideal photon-number-resolved detectors are mutually compared.
