Hardy's nonlocality argument as witness for post-quantum correlation
  Recently, Gallego et.al. [Phys. Rev. Lett 107, 210403 (2011)] proved that any future information principle aiming at distinguishing between quantum and post-quantum correlation must be intrinsically multipartite in nature. We establish similar result by using device independent success probability of Hardy's nonlocality argument for tripartite quantum system. We construct an example of a tri-partite Hardy correlation which is post-quantum but satisfies not only all bipartite information principle but also the GYNI inequality. 
Subhadipa Das, Manik Banik, Ashutosh Rai, MD Rajjak Gazi, Samir Kunkri
quant-ph