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Materials

Quantum Batteries in two-dimensional material-based Josephson Junctions

V. Varrica, G. Gemme, F. M. D. Pellegrino, E. Paladino, M. Sassetti, D. Ferraro

Featured June 1, 2026

Original Paper

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Simply

Using graphene junctions as tiny batteries allows for efficient energy storage by tuning the electrical phase, enabling faster and more powerful charging than traditional methods.

In depth
The paper proposes a solid-state quantum battery architecture where a graphene Josephson junction acts as a collection of Andreev bound states. These states are coupled to an LC resonator, and the authors demonstrate that unique longitudinal interaction terms—arising from the coupling between the resonator flux and the junction supercurrent—can significantly enhance energy storage efficiency, particularly in two-photon resonant regimes.

Key Takeaways

  • 1
    The architecture utilizes Andreev bound states in graphene Josephson junctions as a scalable, solid-state platform for quantum energy storage.
  • 2
    The presence of longitudinal coupling terms provides a mechanism to enhance energy storage through two-photon resonant processes, distinguishing this model from the standard Dicke model.
  • 3
    An alternative charging protocol based on modulating the superconducting phase difference offers a viable path to reduce hardware complexity in experimental implementations.

Conceptual Flow

HIGH LEVEL
1
Methodology

The researchers connect a tiny superconducting loop to a resonator to act as a battery.

Resonator
Superconducting Loop
Inductive Coupling
Quantum Battery
2
Results

They found that changing the electrical phase makes the battery charge much better.

Phase Control

Energy Transfer

Stored Energy