Generation of maximally-entangled long-lived states with giant atoms in a waveguide

TL;DR

This paper demonstrates efficient generation of long-lived, maximally-entangled states between giant atoms in a waveguide, utilizing photon-mediated interactions, interference effects, and steady-state driving, with observable photon bunching as an entanglement witness.

Contribution

It introduces a method to generate and detect highly entangled states of giant atoms in a waveguide, enhancing entanglement creation through adjustable decay and interference effects.

Findings

Spontaneous sudden birth of entanglement is enhanced with giant atoms.

Steady-state highly entangled states can be achieved with resonant classical driving.

Photon bunching correlates with maximal entanglement, serving as a witness.

Abstract

In this paper we show how to generate efficiently entanglement between two artificial giant atoms with photon-mediated interactions in a waveguide. Taking advantage of the adjustable decay processes of giant atoms into the waveguide, and of the interference processes, spontaneous sudden birth of entanglement can be strongly enhanced with giant atoms. Highly entangled states can also be generated in the steady-state regime when the system is driven by a resonant classical field. We show that the statistics of the light emitted by the system can be used as a witness of the presence of entanglement in the system, since giant photon bunching is observed close to the regime of maximal entanglement. Given the degree of quantum correlations incoherently generated in this system, our results open a broad avenue for the generation of quantum correlations and manipulation of photon statistics in systems of giant atoms.