Optical storage of high-density information beyond the diffraction limit: A quantum study

We propose an optical readout scheme allowing a proof of principle of information extraction below the diffraction limit. This technique, which could lead to improvement in data readout density onto optical disks, is independent from the wavelength and numerical aperture of the reading apparatus, and involves a multipixel array detector. Furthermore, we show how to use nonclassical light in order to perform a bit discrimination beyond the quantum noise limit.