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We investigate the relation between quantum nonlocality and gravity at theastrophysical scale, both in the classical and quantum regimes. Consideringparticle pairs orbiting in the strong gravitational field of ultra-compactobjects, we find that the violation of Bell inequality acquires an angularmodulation factor that strongly depends on the nature of the gravitationalsource. We show how such gravitationally-induced modulation of quantumnonlocality readily discriminates between black holes (both classical andinclusive of quantum corrections) and string fuzzballs, i.e., the true quantumdescription of ultra-compact objects according to string theory. These findingspromote Bell nonlocality as a potentially key tool in comparing differentmodels of classical and quantum gravity and putting them to the test.

Gravitationally modulated quantum correlations: Discriminating classical and quantum models of ultra-compact objects with Bell nonlocality