Optical storage of high density information beyond the diffraction limit   : a quantum study
  We propose an optical read-out scheme allowing a demonstration of principle of information extraction below the diffraction limit. This technique, which could lead to improvement in data read-out density onto optical discs, is independent from the wavelength and numerical aperture of the reading apparatus, and involves a multi-pixel array detector. Furthermore, we show how to use non classical light in order to perform bit discrimination beyond the quantum noise limit. 
Vincent Delaubert (LKB - Jussieu), Nicolas Treps (LKB - Jussieu), Gao   Bo (LPA), Claude Fabre (LKB - Jussieu)