  Photon-number squeezing and correlations enable measurement of absorption
with an accuracy exceeding that of the shot-noise limit. However, sub-shot
noise imaging and sensing based on these methods require high detection
efficiency, which can be a serious obstacle if measurements are carried out in
"difficult" spectral ranges. We show that this problem can be overcome through
the phase-sensitive amplification before detection. Here we propose an
experimental scheme of sub-shot-noise imaging with tolerance to detection
losses.
