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Bell inequalities stronger than the Clauser-Horne-Shimony-Holt inequality for three-level isotropic states
We show that some two-party Bell inequalities with two-valued observables are stronger than the CHSH inequality for $3\ensuremath{\bigotimes}3$ isotropic states in the sense that they are violated by some isotropic states in the $3\ensuremath{\bigotimes}3$ system that do not violate the CHSH inequality. These Bell inequalities are obtained by applying triangular …