Super-resolving multi-photon interferences with independent light   sources
  We propose to use multi-photon interferences from statistically independent light sources in combination with linear optical detection techniques to enhance the resolution in imaging. Experimental results with up to five independent thermal light sources confirm this approach to improve the spatial resolution. Since no involved quantum state preparation or detection is required the experiment can be considered an extension of the Hanbury Brown and Twiss experiment for spatial intensity correlations of order N>2. 
Steffen Oppel, Thomas B\"uttner, Pieter Kok, Joachim von Zanthier
quant-ph