Exploring quantum correlations of classical light source for image transmission

There has been an interesting debate on the quantum versus classical origin of ghost imaging in thermal light. To clarify this quantum-classical dilemma, Lixiang Chen at Xiamen University of China formulated a density matrix to fully describe thermal two-photon orbital angular momentum state, which revealed the hidden quantumness with non-zero discord. Then, a scheme of mimicking teleportation was devised to demonstrate the possibility of teleporting an optical image, with an accompanying featureless background.