Nonlocality Tests Enhanced by a Third Observer

Daniel Cavalcanti, Rafael Rabelo, Valerio Scarani
2012 Physical Review Letters  
We consider Bell tests involving bipartite states shared between three parties. We show that the simple inclusion of a third part may greatly simplify the measurement scenario (in terms of the number of measurement settings per part) and allows the identification of previously unknown nonlocal resources.
doi:10.1103/physrevlett.108.040402 pmid:22400815 fatcat:xu3ewzjxbnbu5ntjie634qzo5q