Superextensive charging speeds in a correlated quantum charger

TL;DR

This paper demonstrates that long-range interactions in quantum chargers can induce superlinear charging power scaling, surpassing noninteracting systems, with implications for quantum energy transfer and experimental realization.

Contribution

It introduces the concept of superextensive charging speeds in correlated quantum systems and analyzes their behavior using the Lipkin-Meshkov-Glick model and spin chains.

Findings

Superlinear scaling of charging power due to long-range interactions

Persistence of the effect up to a critical system size

Potential for experimental observation in trapped-ion systems

Abstract

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.