Enhanced Thermal Object Imaging by Photon Addition or Subtraction
  Long-baseline interferometry (LBI) is used to reconstruct the image of faint thermal objects. The image quality, for a given exposure time, is in general limited by a low signal-to-noise ratio (SNR). We show theoretically that a significant increase of the SNR, in a LBI, is possible by adding or subtracting photons to the thermal beam. At low photon counts, photon addition-subtraction technology strongly enhances the image quality. We have experimentally realized a nondeterministic physical protocol for photon subtraction. Our theoretical predictions are supported by experimental results. 
Claudio Parazzoli, Benjamin Koltenbah, David Gerwe, Paul Idell, Bryan   Gard, Richard Birrittella, S M Hashemi Rafsanjani, M...
physics.optics quant-ph