https://doi.org/10.1140/epjp/s13360-026-07815-1
Regular Article
Coherence-driven ergotropy stabilization and collective quantum advantage in few-body quantum batteries
1
LPHE-Modeling and Simulation, Faculty of Sciences, Mohammed V University in Rabat, Rabat, Morocco
2
Centre of Physics and Mathematics, CPM, Faculty of Sciences, Mohammed V University in Rabat, Rabat, Morocco
3
College of Physical and Chemical Sciences, Hassan II Academy of Sciences and Technology, Rabat, Morocco
a
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Received:
18
November
2025
Accepted:
11
May
2026
Published online:
29
May
2026
Abstract
Quantum batteries, miniature energy storage devices that operate at the quantum scale, offer a promising platform to discover how quantum resources can enhance energy storage and power delivery beyond classical limits. In this paper, we investigate the emergence of quantum advantage and energetic stability in few-body quantum batteries, focusing on single-atom and two-qubit architectures. Using ergotropy as a measure of extractable work, we reveal a direct dynamical correspondence between quantum coherence and energy storage efficiency in both single-atom and two-qubit configurations. For a driven two-level atom, we reveal a one-to-one correspondence between quantum coherence and stored energy, demonstrating that coherence decay directly governs the temporal degradation of ergotropy. Extending to a two-qubit system, we show that quantum coherence tracks ergotropy oscillations and enhances the stability of extractable work under open-system dynamics. Finally, we derive a generalized quantum advantage ratio that incorporates interaction-induced corrections, establishing a quantitative criterion for the onset of parallel and collective battery assembling. This work provides a microscopic understanding of how coherence and correlations act as energetic resources, bridging single-particle and few-body regimes in the design of stable and high-performance quantum batteries.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2026
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
