Two-photon interference with true thermal light
  Two-photon interference and "ghost" imaging with entangled light have attracted much attention since the last century because of the novel features such as non-locality and sub-wavelength effect. Recently, it has been found that pseudo-thermal light can mimic certain effects of entangled light. We report here the first observation of two-photon interference with true thermal light. 
Yan-Hua Zhai, Xi-Hao Chen, Da Zhang, Ling-An Wu