Optimal charging of a superconducting quantum battery

TL;DR

This paper reports the experimental realization of a superconducting quantum battery that uses dark and bright states for stable and powerful charging, employing quantum adiabatic brachistochrone to enhance ergotropy injection, and analyzes self-discharge mechanisms.

Contribution

It introduces an experimental superconducting quantum battery utilizing dark and bright states with a novel charging scheme based on quantum adiabatic brachistochrone.

Findings

Achieved stable and powerful charging using dark and bright states.

Enhanced ergotropy injection speed with quantum adiabatic brachistochrone.

Identified self-discharge behavior similar to supercapacitors.

Abstract

Quantum batteries are miniature energy storage devices and play a very important role in quantum thermodynamics. In recent years, quantum batteries have been extensively studied, but limited in theoretical level. Here we report the experimental realization of a quantum battery based on superconducting qubits. Our model explores dark and bright states to achieve stable and powerful charging processes, respectively. Our scheme makes use of the quantum adiabatic brachistochrone, which allows us to speed up the {battery ergotropy injection. Due to the inherent interaction of the system with its surrounding, the battery exhibits a self-discharge, which is shown to be described by a supercapacitor-like self-discharging mechanism. Our results paves the way for proposals of new superconducting circuits able to store extractable work for further usage.