The Bose-Marletto-Vedral proposal in different frames of reference and the quantum nature of gravity

TL;DR

This paper explores how the BMV experiment's implications for quantum gravity are consistent across different inertial frames, emphasizing the non-classical nature of gravity and potential differences in entanglement in accelerated frames.

Contribution

It demonstrates that all components of the gravitational potential must be non-classical for consistent relativistic descriptions of the BMV experiment.

Findings

Gravitational potential components are necessarily non-classical.

Entanglement may vary between accelerated and stationary frames.

Relativistic invariance constrains quantum properties of gravity.

Abstract

Observing spatial entanglement in the Bose-Marletto-Vedral (BMV) experiment would demonstrate the existence of non-classical properties of the gravitational field. We show that the special relativistic invariance of the linear regime of general relativity implies that all the components of the gravitational potential must be non-classical. This is simply necessary in order to describe the BMV entanglement consistently across different inertial frames of reference. On the other hand, we show that the entanglement in accelerated frames could differ from that in stationary frames.