We define a quantum charger as an interacting quantum system that transfers energy between two drives. The key figure of merit characterizing a charger is its charging power. Remarkably, the presence of long-range interactions within the charger can induce a collective steady-state charging mode that depends superlinearly on the size of the charger, exceeding the performance of noninteracting, parallel units. Using the driven Lipkin-Meshkov-Glick model and power-law interacting spin chains, we show that this effect persists up to a critical system size set by the breakdown of the high-frequency regime. We discuss optimal work output as well as experimentally accessible initial states. The superlinear charging effect can be probed in trapped-ion experiments, and positions interacting Floquet systems as promising platforms for enhanced energy conversion.
Cite
@article{arxiv.2601.02477,
title = {Superextensive charging speeds in a correlated quantum charger},
author = {Harald Schmid and Felix von Oppen and Gil Refael and Yang Peng},
journal= {arXiv preprint arXiv:2601.02477},
year = {2026}
}