Graphene-based Josephson junctions could make better quantum batteries

A graphene Josephson junction coupled to a microwave resonator can function as a quantum battery, with Andreev bound states playing the role of individual charge cells. The unusual physics of the junction adds interaction terms absent in standard models, and these extra couplings boost energy storage across a useful range of parameters. Charging can also be controlled simply by tuning the superconducting phase difference — a knob already available in most superconducting circuits.