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2018

When can gravity path-entangle two spatially superposed masses?

Marletto, Chiara, Vedral, Vlatko

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An experimental test of quantum effects in gravity has recently been proposed, where the ability of the gravitational field to entangle two masses is used as a witness of its quantum nature.

The key idea is that if gravity can generate entanglement between two masses then it must have at least some quantum features (i.e., two non-commuting observables).
Here we discuss what existing models for coupled matter and gravity predict for this experiment.
Collapse-type models, and also quantum field theory in curved spacetime, as well as various induced gravities, do not predict entanglement generation; they would therefore be ruled out by observing entanglement in the experiment.

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