Collective Quantum Batteries and Charger-Battery Setup in Open Quantum Systems: Impact of Inter-Qubit Interactions, Dissipation, and Quantum Criticality

TL;DR

This paper investigates three models of two-qubit open quantum systems to understand how inter-qubit interactions, environmental factors, and quantum criticality influence quantum battery performance.

Contribution

It introduces and analyzes three novel two-qubit models, highlighting the effects of interactions, baths, and criticality on quantum battery efficiency.

Findings

Inter-qubit interactions affect quantum battery performance.

Bath temperature and inter-atomic distance influence energy storage.

Quantum criticality significantly impacts storage capacity.

Abstract

Quantum batteries have emerged as promising platforms for exploring energy storage and transfer processes governed by quantum mechanical laws. In this work, we study three models of two-qubit open quantum systems. The first model comprises two central spins immersed in spin baths, and both central spins are collectively considered as quantum batteries. The impact of inter-qubit interactions on the performance of the quantum battery is investigated. In the second model, a two-qubit model interacting with a squeezed thermal bath serves as a collective quantum battery, where the impact of inter-atomic distance and the bath temperature on the battery's performance is explored. Furthermore, a two-qubit model is used, where one qubit is modeled as a battery and the other as a charger. The charger in this model interacts with an anisotropic spin-chain bath, which is conducive to quantum criticality. It is demonstrated that this criticality has a substantial impact on the quantum battery's storage capacity.