Detecting Bell Correlations in Multipartite Non-Gaussian Spin States
Detecting Bell Correlations in Multipartite Non-Gaussian Spin States
We expand the toolbox for studying Bell correlations in multipartite systems by introducing permutationally invariant Bell inequalities (PIBIs) involving few-body correlators. First, we present around twenty families of PIBIs with up to three- or four-body correlators, that are valid for an arbitrary number of particles. Compared to known inequalities, these …