Spatial interference between pairs of disjoint optical paths with a   single chaotic source
  We demonstrate a novel second-order spatial interference effect between two indistinguishable pairs of disjoint optical paths from a single chaotic source. Beside providing a deeper understanding of the physics of multi-photon interference and coherence, the effect enables retrieving information on both the spatial structure and the relative position of two distant double-pinhole masks, in the absence of first order coherence. We also demonstrate the exploitation of the phenomenon for simulating quantum logic gates, including a controlled-NOT gate operation. 
Michele Cassano, Milena D'Angelo, Augusto Garuccio, Tao Peng, Yanhua   Shih, and Vincenzo Tamma
quant-ph