Superextensive electrical power from a quantum battery

Abstract

Superextensivity, where the response of a physical system scales super-linearly with size, originates from collective quantum effects and provides a promising route to augment next-generation quantum technologies. While recent work has demonstrated superextensive behaviour in the coherent dynamics of quantum systems, these effects typically occur on short timescales, prohibiting their practical utility. In contrast, triggering steady-state superextensive effects in, for example, a generated electric current, remains unexplored despite the immediate impact on photovoltaic technologies. Here, we utilise a microcavity quantum battery as an experimental platform that superextensively captures li..