Finding a quantum battery model that displays a genuine quantum advantage, while being prone to experimental fabrication, is an extremely challenging task. In this Letter we propose a deceptively simple quantum battery model that displays a genuine quantum advantage, saturating the quantum speed limit. It consists of two harmonic oscillators (the charger and the battery), coupled during the non-equilibrium charging dynamics by a non-linear interaction. We first present the model, then certify the genuine quantum advantage, and finally briefly discuss how the battery can be fabricated through the use of superconducting circuits.
@article{arxiv.2409.08627,
title = {Genuine quantum advantage in non-linear bosonic quantum batteries},
author = {Gian Marcello Andolina and Vittoria Stanzione and Vittorio Giovannetti and Marco Polini},
journal= {arXiv preprint arXiv:2409.08627},
year = {2025}
}