Harvesting entanglement from complex scalar and fermionic fields with linearly coupled particle detectors

TL;DR

This paper investigates entanglement harvesting using particle detectors coupled to complex scalar and fermionic fields, demonstrating that complex detectors can significantly enhance entanglement extraction.

Contribution

It introduces a model of entanglement harvesting with non-Hermitian fields and shows how complex detectors can boost harvested entanglement compared to real detectors.

Findings

Complex scalar models approximate fermionic models at large mass.

Complex detectors can increase negativity by up to two orders of magnitude.

Entanglement harvesting efficiency depends on field mass and detector properties.

Abstract

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 find that the complex scalar model can be a good approximation for the fermionic model in the protocol of entanglement harvesting when the mass of the field is sufficiently large compared to the inverse interaction time. Moreover, we show that by taking advantage of the U(1) degree of freedom of a complex detector it is possible to increase the harvested negativity by up to two orders of magnitude when compared to the case of a real detector.