  In an initially uncorrelated mixed separable bi-partite system, quantum
correlations can emerge under the action of a local measurement or local noise
[A. Streltsov, H. Kampermann, and D. Bru\ss{}, Phys. Rev. Lett. 107, 170502
(2011)]. We analyze this counter-intuitive phenomenon using quantum discord as
a quantifier. We then relate changes in quantum discord to system-environment
correlations between the system in a mixed state and some purifying
environmental mode using the Koashi-Winter inequality. On this basis, we
suggest an interpretation of discord as a byproduct of transferring
entanglement and correlations around the different subsystems of a global pure
state.
