Experimental evidence of high-resolution ghost imaging and ghost   diffraction with classical thermal light
  High-resolution ghost image and ghost diffraction experiments are performed by using a single source of thermal-like speckle light divided by a beam splitter. Passing from the image to the diffraction result solely relies on changing the optical setup in the reference arm, while leaving untouched the object arm. The product of spatial resolutions of the ghost image and ghost diffraction experiments is shown to overcome a limit which was formerly thought to be achievable only with entangled photons. 
Davide Magatti, Fabio Ferri, Alessandra Gatti, Morten Bache, Enrico   Brambilla and Luigi A. Lugiato (INFM, Dipartimento di ...