Optimizing quantum violation yields facet Bell inequalities

Abstract

Nonlocality is revealed through violations of Bell inequalities, whose complete characterization defines the local polytope. For multipartite systems, however, the local polytope becomes rapidly intractable as the number of parties increases. A natural strategy is therefore to optimize Bell inequalities with respect to the ratio of their quantum value to their classical bound. We prove that a nondegenerate local maximum of this ratio gives a facet Bell inequality, and we propose a gradient-based method that searches for such inequalities iteratively. Applied to permutation-invariant scenarios, our method produces tight Bell inequalities with robust quantum violations. Our method enables certification of nonlocality without complete knowledge of the local polytope. More generally, it applies to optimization problems in quantum information involving a classical polytope and a quantum convex set.

arXiv comment9+11 pages, 4+1 figures, details of infinite N results are moved to 2607.08462