Generation of a non-zero discord bipartite state with classical   second-order interference
  We report investigation on quantum discord in classical second-order interference. In particular, we theoretically show that a bipartite state with D = 0.311 of discord can be generated via classical second-order interference. We also experimentally verify the theory by obtaining D = 0.197 +- 0.060 of non-zero discord state. Together with the fact that non-classicalities originated from physical constraints and information theoretic perspectives are not equivalent, this result provides an insight to understand the nature of quantum discord. 
Yujun Choi, Kang-Hee Hong, Hyang-Tag Lim, Jiwon Yune, Osung Kwon,   Sang-Wook Han, Kyunghwan Oh, Yoon-Ho Kim, Yong-Su Kim, S...
quant-ph