On the Role of Locality in the Bose-Marletto-Vedral Effect

Abstract

Two of us recently proposed an entanglement-based witness of non-classicality, which can be applied to testing quantum effects in gravity in what is known as the Bose-Marletto-Vedral (BMV) effect. The witness is based on this idea: if a system can create entanglement between two quantum probes by local means only, then it must be non-classical. In this note we discuss the role of locality as an assumption for the theorem supporting the witness; we also discuss other related notions of locality and comment on their mutual relations.

To appear in D. Rickles, X. Arsiwalla, and H. Elshatlawy (eds.), Quantum Gravity and Computation: Information, Pregeometry, and Digital Physics (Routledge, forthcoming)