Search

We present a duality between a particle detector model coupled to the amplitude of a scalar field and coupled to the field's derivative in the limit of large energy gaps. We show that the results of the models can be mapped to each other in a one-to-one fashion modulo a rescaling by the detector's gap. Our analysis is valid for arbitrary scalar fields in curved spacetimes, and requires minimal assumptions regarding the detectors. The duality also applies to the case where more than one detector is coupled to the field. This shows that many examples of entanglement harvesting with amplitude coupled UDW detectors give exactly the same result as derivative coupled detectors that interact with the field in the same region of spacetime., 9 pages, 3 figures + appendix

We revisit the Bose-Marletto-Vedral (BMV) table-top experimental proposal -- which aims to witness quantum gravity using gravity mediated entanglement -- analyzing the role of locality in the experiment. We show how gravity mediated entanglement in the BMV experiment can be accounted for without appealing to the quantum nature of the gravitational field. We then carry out a fully quantum modelling of the interaction of matter and gravity and identify the modifications that a BMV-like experiment should have in order to truly reveal quantum features of the gravitational interaction., 5 pages + appendices, 1 figure. V3: incorporated feedback, and improved presentation

We explore entanglement harvesting with particle detectors that couple linearly to non-Hermitian fields. Specifically, we analyze the case of particle detectors coupled to a complex scalar quantum field and to a spin 1/2 fermionic field. We then compare these models with the well-known case of a real scalar field and previous results using quadratic models. Unlike quadratic models, the linear models are able to distinguish the particle from the anti-particle sector of the field. This leads to striking differences between quadratic couplings -- which cannot be related to physically observable processes -- and linear couplings -- that can be related to high-energy physics. Finally, we use this analysis to comment on the role that the field statistics plays on the protocol., 19 pages, 10 Figures, 3 Appendices. RevTeX 4.1. V2: Fixed several inconsistencies of the first version including issues with Figures