Genuine quantum advantage in non-linear bosonic quantum batteries

TL;DR

This paper introduces a simple, experimentally feasible quantum battery model with harmonic oscillators that demonstrates a genuine quantum advantage by saturating the quantum speed limit during non-linear charging dynamics.

Contribution

The authors propose a new quantum battery model using coupled harmonic oscillators with non-linear interactions, showing a genuine quantum advantage and discussing its experimental realization.

Findings

The model saturates the quantum speed limit during charging.

It demonstrates a clear quantum advantage over classical counterparts.

Potential implementation using superconducting circuits is discussed.

Abstract

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.