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This paper points out the importance of the assumption of locality ofphysical interactions, and the concomitant necessity of propagation of anentity (in this case, off-shell quanta - virtual gravitons) between twonon-relativistic test masses in unveiling the quantum nature of linearizedgravity through a laboratory experiment. At the outset, we will argue thatobserving the quantum nature of a system is not limited to evidencing$O\left(\hbar\right)$ corrections to a classical theory: it instead hinges uponverifying tasks that a classical system cannot accomplish. We explain thebackground concepts needed from quantum field theory and quantum informationtheory to fully appreciate the previously proposed table-top experiments:namely forces arising through the exchange of virtual (off-shell) quanta, aswell as Local Operations and Classical Communication (LOCC) and entanglementwitnesses. We clarify the key assumption inherent in our evidencing experiment,namely the locality of physical interactions, which is a generic feature ofinteracting systems of quantum fields around us, and naturally incorporatesmicro-causality in the description of our experiment. We also present the typesof states the matter field must inhabit, putting the experiment on firmrelativistic quantum field theoretic grounds. At the end we use a non-localtheory of gravity to illustrate how our mechanism may still be used to detectthe qualitatively quantum nature of a force when the scale of non-locality isfinite. We find that the scale of non-locality, including the entanglemententropy production in local/ non-local gravity, may be revealed from theresults of our experiment.

Locality & Entanglement in Table-Top Testing of the Quantum Nature of Linearized Gravity