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Recently there has been a great deal of interest in tabletop experiments intended to exhibit the quantum nature of gravity by demonstrating that it can induce entanglement. In order to evaluate these experiments, we must determine if there is any interesting class of possibilities that will be convincingly ruled out if it turns out that gravity can indeed induce entanglement. In particular, since one argument for the significance of these experiments rests on the claim that they demonstrate the existence of superpositions of spacetimes, it is important to keep in mind that different interpretations of quantum mechanics may make different predictions about superpositions of spacetimes. ψ


This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Foundations of Physics, volume 52, in 2022 following peer review. The final publication may differ and is available at Springer via

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Available for download on Sunday, October 08, 2023