Cluster Ising quantum batteries can mimic super-extensive charging power

TL;DR

This paper demonstrates that an extended cluster-Ising model can exhibit super-extensive charging power in quantum batteries, challenging previous beliefs and showing potential for large-scale quantum energy storage.

Contribution

It reveals that super-extensive charging power can occur in an integrable spin chain model, contrary to prior assumptions, and explores its robustness at finite temperatures.

Findings

Super-extensive charging power observed up to 1000 spins.

Anomalous scaling due to super-extensive energy growth.

Phenomenon persists at finite temperatures.

Abstract

Quantum batteries, miniaturized devices able to store and release energy on demand, are promising both because their intrinsic energy and time scales can match those of other quantum technologies and due to the intriguing possibility of achieving super-extensive charging power. While this enhanced scaling is known to appear in several settings, it is generally believed to be forbidden in Wigner-Jordan integrable spin chains charged via quantum-quench protocols. Here, we show that an extended cluster-Ising model, despite belonging to the above category, exhibits super-extensive charging power over wide ranges of system sizes, reaching up to a thousand spins, in proper parameter regimes. This remarkable anomalous scaling is due to a corresponding super-extensive growth of the stored energy, implying that it occurs at large but finite size and cannot persist in the thermodynamic limit. This phenomenon appears robust against finite-temperature effects.