Three-level Dicke quantum battery

TL;DR

This paper introduces a three-level Dicke quantum battery, analyzing its charging performance with different quantum states, and finds that entanglement influences energy locking and extractability, with optimal energy storage at N=10.

Contribution

It proposes a novel three-level Dicke quantum battery model and investigates how different quantum states affect its charging efficiency and energy extractability.

Findings

Performance is best with a coherent state.

Locked energy correlates with charger-battery entanglement.

Full energy extractability achieved at N=10.

Abstract

Quantum battery (QB) is the energy storage and extraction device that is governed by the principles of quantum mechanics. Here we propose a three-level Dicke QB and investigate its charging process by considering three quantum optical states: a Fock state, a coherent state, and a squeezed state. The performance of the QB in a coherent state is substantially improved compared to a Fock and squeezed states. We find that the locked energy is positively related to the entanglement between the charger and the battery, and diminishing the entanglement leads to the enhancement of the ergotropy. We demonstrate the QB system is asymptotically free as $N \rightarrow \infty$. The stored energy becomes fully extractable when $N=10$, and the charging power follows the consistent behavior as the stored energy, independent of the initial state of the charger.