Collisional charging of a transmon quantum battery

TL;DR

This paper introduces a superconducting transmon-based quantum battery model charged by ancillary two-level systems, demonstrating high control over stored energy and extraction within current quantum circuit capabilities.

Contribution

It presents a novel quantum battery model using anharmonic superconducting circuits and analyzes its performance with coherent ancillas through numerical simulations.

Findings

Coherent ancillas enable remarkable energy control.

The model achieves efficient energy storage and extraction.

Performance is within reach of current quantum circuit technology.

Abstract

Motivated by recent developments in the field of multilevel quantum batteries, we present the model of a quantum device for energy storage with anharmonic level spacing, based on a superconducting circuit in the transmon regime. It is charged via the sequential interaction with a collection of identical and independent ancillary two-level systems. By means of a numerical analysis we show that, in case these ancillas are coherent, this kind of quantum battery can achieve remarkable performances for what it concerns the control of the stored energy and its extraction in regimes of parameters within reach in nowadays quantum circuits.