Sunburst quantum Ising battery

TL;DR

This paper investigates a sunburst quantum Ising model for quantum batteries, demonstrating how coupling optimization enhances energy extraction and charging power independently of initial states.

Contribution

It introduces a novel sunburst quantum Ising model and analyzes how coupling affects ergotropy and charging power, providing insights into optimizing quantum battery performance.

Findings

Coupling optimizes ergotropy and charging power simultaneously.

Maximum charging power increases with coupling strength.

Ergotropy and charging power are independent of initial charger state.

Abstract

We study the energy transfer process in the recently proposed sunburst quantum Ising model, which consists of two interacting integrable systems: a transverse Ising chain with a very small transverse field and a finite number of external isolated qubits. We show that in this model of the quantum battery, coupling between the battery and charger can be used to optimize the ergotropy, which is the maximum amount of energy that can be extracted from the battery. At the same time, maximum charging power increases with the coupling strength, allowing for the simultaneous optimization of both ergotropy and charging power in the strong coupling limit. Furthermore, we show that both ergotropy and charging power are independent of the initial state of the charger.