A Bell test is a real-world physics experiment designed to rule out classical (local-realistic) descriptions of nature how strongly distant particles can correlate. In a purely classical world, there’s a maximum possible correlation set by a so-called *Bell inequality*, but quantum mechanics predicts stronger correlations that violate this classical limit. Experiments consistently confirm these stronger “nonlocal” correlations, showing that nature isn’t purely classical—yet quantum physics still respects its own upper limit on how strong these correlations can be. >[!read]- Further Reading > - [[Entanglement]] > - [[Bell Nonlocality]] >[!ref]- References >- J. S. Bell, On the Einstein Podolsky Rosen paradox, Physics Physique Fizika **1**, 195 (1964). >- J. F. Clauser, M. A. Horne, A. Shimony, and R. A. Holt, Proposed Experiment to Test Local Hidden-Variable Theories, Phys. Rev. Lett. **23**, 880 (1969).