All-multipartite Bell-correlation inequalities for two dichotomic observables per site - art. no. 032112

We construct a set of 2(2n) independent Bell-correlation inequalities for n -partite systems with two dichotomic observables each, which is complete in the sense that the inequalities are satisfied if and only if the correlati ons considered allow a local classical model. All these inequalities can be summarized in a single, albeit nonlinear inequality. We show that quantum correlations satisfy this condition provided the state has positive partial transpose with respect to any grouping of the n systems into two subsystem s. We also provide an efficient algorithm for finding the maximal quantum-m echanical violation of each inequality, and show that the maximum is always attained for the generalized GHZ state.