Quantum steering as a probe of energy transfer in quantum batteries

TL;DR

This paper explores how Einstein-Podolsky-Rosen (EPR) steering can be used as a resource to understand and enhance energy transfer and storage in quantum batteries, providing new ways to monitor and improve their performance.

Contribution

It introduces the role of quantum steering as a novel indicator and resource for optimizing energy dynamics in quantum batteries with shared reservoirs.

Findings

Steering is stored until energy equilibrium is reached.

Steering enhances energy storage and extractable work.

Steering acts as a witness to battery population balance.

Abstract

This study investigates the role of EPR steering in characterizing the energy dynamics of quantum batteries (QBs) within \textcolor{black}{a charging system that features shared reservoirs. After optimizing parameter configurations to achieve high-energy systems, we observe across a variety of charging scenarios with low-dissipation regimes that steering serves as a vital resource: it is initially stored until the system reaches energy equilibrium, and then subsequently utilized to sustain the enhancement of energy storage. Furthermore, steering acts as a witness to battery population balance and a consumable that enhances extractable work. Additionally, we discuss the contribution of the steering potential to energy upon high-dissipation charging in details. These findings establish a novel indicator for monitoring QB energy variations, which will be beneficial to achieve the high-performance quantum batteries.