Gravity entanglement, quantum reference systems, degrees of freedom

TL;DR

This paper interprets gravity-mediated entanglement using quantum reference systems, identifies the key gravitational degree of freedom involved, and clarifies conceptual distinctions relevant to quantum gravity and information.

Contribution

It provides a novel interpretation of gravity-induced entanglement through quantum reference systems and clarifies the role of gravitational degrees of freedom.

Findings

Identifies the single gravitational degree of freedom mediating entanglement

Clarifies the irrelevance of longitudinal vs transverse degrees for interpretation

Discusses implications for quantum gravity and quantum information communities

Abstract

We discuss the physical interpretation of the gravity mediated entanglement effect. We show how to read it in terms of quantum reference systems. We pinpoint the single gravitational degree of freedom mediating the entanglement. We clarify why the distinction between longitudinal and transverse degrees of freedom is irrelevant for the interpretation of the results. We discuss the relation between the LOCC theorem and the interpretation of the effect, its different relevance for, respectively, the quantum gravity and quantum information communities, and the reason for the excitement raised by the prospect of detection.