Generalization of the Clauser-Horne-Shimony-Holt inequality self-testing maximally entangled states of any local dimension

Abstract

The Clauser-Horne-Shimony-Holt inequality (CHSH) is one of the most popular and well-studied witnesses of Bell's theorem, separating classical from quantum correlations. In this work, for every d≥2, we present a generalization of the CHSH inequality with the property that maximal violation is achieved uniquely by the maximally entangled state of local dimension d. This provides an avenue for device-independent certification of maximally entangled states of arbitrary local dimension.