Experimental Exploration of Quantum Correlations: Discord versus   Entanglement
  Quantum correlations represent a fundamental tool for studies ranging from basic science to quantum technologies. Different non-classical correlations have been identified and studied, as entanglement and discord. In view of future applications in this letter we explore experimentally the rich geometry of Bell-diagonal states, measuring the values of entanglement and discord and highlighting the effect of decoherence in real experiments. 
E. Moreva, M. Gramegna, M.A. Yurischev, M. Genovese
quant-ph