Answers to a few questions regarding the BMV experiment

TL;DR

This paper clarifies key questions and misconceptions about the BMV experiment, defending its implications for the quantum nature of gravity and addressing common objections and subtleties.

Contribution

It provides detailed responses to critiques of the BMV experiment, reaffirming its significance in testing the quantum aspects of gravity.

Findings

Objections to the BMV experiment are addressed and refuted.

The experiment's implications for non-classical gravity are reinforced.

Clarifications on subtleties in interpreting the BMV results.

Abstract

We provide brief answers to a number of recurring questions about the BMV effect and the related experimental proposal (Bose et al., 2017; Marletto and Vedral, 2017). Some of these questions include alleged counter-examples to our result, stating that if gravity (or anything mediating the interaction) can create entanglement while complying with locality, then it must then be non-classical. Here we explain why these objections are not counter-examples and why our result still stands; we also explore a few other important subtleties often disregarded on a first read of our paper (Marletto and Vedral, 2017).