Derivative coupling enables genuine entanglement harvesting in causal communication

TL;DR

This paper demonstrates that derivative coupling allows particle detectors to harvest entanglement from a quantum field even when they are causally connected, highlighting a novel mechanism relevant for experimental systems.

Contribution

It introduces the concept that derivative coupling enables genuine entanglement harvesting in causal contact, expanding understanding of quantum field interactions.

Findings

Entanglement can be harvested via derivative coupling even in causal contact.

Harvested entanglement peaks at full light contact.

Derivative coupling models are experimentally relevant.

Abstract

We show that particle detectors coupled to a massless quantum field through its derivative can genuinely harvest entanglement form the field even when they are in causal contact in flat spacetime. This is particularly relevant since the derivative coupling model captures some interesting experimentally realizable systems and since the harvested entanglement peaks at full light contact.