  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.
