Nonlocal Quantum XOR Games for Large Number of Players

Nonlocal games are used to display differences between classical and quantum world. In this paper, we study nonlocal games with a large number of players. We give simple methods for calculating the classical and the quantum values for symmetric XOR games with one-bit input per player, a subclass of nonlocal games. We illustrate those methods on the example of the N-player game (due to Ardehali [Ard92]) that provides the maximum quantum-over-classical advantage.