We report an 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 the nonclassicalities originated from physical constraints and information theoretic perspectives are not equivalent, this result provides an insight to understand the nature of quantum discord.
Bibliographical noteFunding Information:
ICT RandD programs of MSIP/IITP (B0101-16-1355, R0101-15-0060); National Research Foundation of Korea (2015K2A1B8047228, 2016R1A2A1A05005202); KIST Research Programs (2E27231, 2V05340, 2E26680-16-P024).
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics