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We provide experimental evidence of quantum features in bi-partite statesclassified as entirely classical according to a conventional criterion based onthe Glauber P-function but possessing non-zero Gaussian quantum discord. Theirquantum nature is experimentally revealed by acting locally on one part of thediscordant state. Adding an environmental system purifying the state, we unveilthe flow of quantum correlations within a global pure system using theKoashi-Winter inequality. We experimentally verify and investigate thecounterintuitive effect of discord increase under the action of local loss andlink it to the entanglement with the environment. For a discordant stategenerated by splitting a state in which the initial squeezing is destroyed byrandom displacements, we demonstrate the recovery of entanglement highlightingthe role of system-environment correlations.

Quantumness of Gaussian Discord: Experimental Evidence and Role of System-Environment Correlations