Graph-theoretical Bounds on the Entangled Value of Non-local Games
  We introduce a novel technique to give bounds to the entangled value of non-local games. The technique is based on a class of graphs used by Cabello, Severini and Winter in 2010. The upper bound uses the famous Lov\'asz theta number and is efficiently computable; the lower one is based on the quantum independence number, which is a quantity used in the study of entanglement-assisted channel capacities and graph homomorphism games. 
Andr\'e Chailloux, Laura Man\v{c}inska, Giannicola Scarpa and Simone   Severini
quant-ph