  Gaussian quantum discord is a measure of quantum correlations in Gaussian
systems. Using Gaussian discord we quantify the quantum correlations of a
bipartite entangled state and a separable two-mode mixture of coherent states.
We experimentally analyze the effect of noise addition and dissipation on
Gaussian discord and show that the former noise degrades the discord while the
latter noise for some states leads to an increase of the discord. In
particular, we experimentally demonstrate the near-death of discord by noisy
evolution and its revival through dissipation.
