Contextual inferences, (non)locality, and the (in)completeness of quantum mechanics

Philippe Grangier

Published 2020-12-17Version 1

In this article we argue that what is usually called "quantum non locality", leading to the violation of Bell's inequality and more generally of classical local realism, can be explained by considering contextual inferences, that are both possible and necessary in quantum physics. They do not show up in classical physics, where contexts may be discarded because physical properties are non-contextual. This analysis allows us to explain why "quantum non locality" does not contradict relativistic causality. Our argument is general from a probabilistic point of view, and it strongly suggests that the usual quantum formalism must be completed, by specifying the measurement context.