Amplified quantum battery via dynamical modulation

TL;DR

This paper explores how frequency modulation of a quantum battery within a dissipative cavity enhances charging efficiency and work extraction, with optimal parameters varying across coupling regimes.

Contribution

It introduces a model of a frequency-modulated quantum battery in a dissipative environment and demonstrates how modulation parameters optimize charging and energy extraction.

Findings

High-amplitude, low-frequency modulation improves charging in strong coupling.

Low-frequency modulation enables energy storage in weak coupling, which is otherwise impossible.

Modulation parameters are crucial for optimizing quantum battery performance.

Abstract

We investigate the charging dynamics of a frequency-modulated quantum battery (QB) placed within a dissipative cavity environment. Our study focuses on the interaction of such a battery under both weak and strong coupling regimes, employing a model in which the quantum battery and charger are represented as frequency-modulated qubits indirectly coupled through a zero-temperature environment. It is demonstrated that both the modulation frequency and amplitude are crucial for optimizing the charging process and the ergotropy of the quantum battery. Specifically, high-amplitude, low-frequency modulation significantly enhances charging performance and work extraction in the strong coupling regime. As an intriguing result, it is deduced that modulation at very low frequencies leads to the emergence of energy storage and work extraction in the weak coupling regime. Such a result can never be achieved without modulation in the weak coupling regime. These results highlight the importance of adjusting modulation parameters to optimize the performance of quantum batteries for real-world applications in quantum technologies.