Classicality from zero discord for continuous-variables bipartite   systems
  Quantum information resources quantified by non-zero discord are ubiquitous for the continuous-variables bipartite systems. Complementary to this, we formally construct a model characterized by zero two-way discord for arbitrarily long time interval. The model is classical in the sense it does not support quantum information processing. We point out some interesting physical features of the model. 
M. Arsenijevic, J. Jeknic-Dugic, M. Dugic
quant-ph