If standard ideas about quantum gravity are right, one would expect the gravitational field to display the same sort of non-local correlations that quantum matter does. ...  No Bell experiment (nor any other experiment) to date has shown it to be the case. However, it can be tested by a relatively simple experiment. The experiment should either provide the first significant evidence for quantum gravity, or else (if standard intuitions are somehow wrong) establish a definite limitation on the domain of validity of quantum theory.

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