  The open-system dynamics of entanglement plays an important role in the
assessment of the robustness of quantum information processes and also in the
investigation of the classical limit of quantum mechanics. Here we show that,
subjacent to this dynamics, there is a subtle flow of quantum correlations. We
use a recently proposed optical setup, which allows joint tomography of system
and environment, to show that the decay of an initial bipartite entangled state
leads to the build up of multipartite entanglement and quantum discord, the
latter exhibiting a non-analytic behavior that signals the emergence of maximal
genuine quantum entanglement. The origin of this analyticity is shown to be
distinct from similar behavior previously found in bipartite systems. Monogamy
relations within the context of open-system dynamics explain this new
phenomenon.
