Information Causality and Extremal Tripartite Correlations
  We study the principle of information causality for the set of extremal correlations in the tripartite scenario. We show that all but one nonlocal extremal correlations in this scenario violate information causality. This undetected correlation is shown to satisfy any bipartite physical principle. 
Tzyh Haur Yang, Daniel Cavalcanti, Mafalda Almeida, Colin Teo, Valerio   Scarani
quant-ph