Limits on inference of gravitational entanglement

On the Significance of Interferometric Revivals for the Fundamental Description of Gravity

“…It should be noted that independent of our work the proposal of Carney, Müller and Taylor [26] has, to the best of our knowledge, been criticised in two recent independent works [37,38] that highlight that the signature claimed to be unique to an entangling channel can be reproduced by semi-classical models. However, unlike our work, [37,38] deviate significantly from the assumptions of theorem 1 in [26] and are thus not conclusive. [37] treats the trajectory of the massive particle classically.…”

“…The resulting additional noise could potentially destroy the revival dynamics, therefore [37] does not invalidate theorem 1 of [26]. [38] provides an example which, as the authors stress, violates the assumption of timetranslation invariance that enters the proof of theorem 1 in [26] in an essential manner. Hence, neither of these two works conclusively falsifies the claims of [26].…”