Quadratic power enhancement in extended Dicke quantum battery

TL;DR

This paper presents a quantum battery model with quadratic power enhancement due to quantum correlations, achieved through a hybrid spin-photon system, promising practical advantages over traditional Dicke batteries.

Contribution

It introduces a hybrid Dicke quantum battery with N^2 scaling of power, demonstrating genuine quantum advantage and practical feasibility.

Findings

Quadratic power enhancement due to quantum correlations.

Experimental feasibility of the hybrid setup.

Power enhancement without significant energy efficiency loss.

Abstract

We demonstrate a quadratic enhancement of power in a battery consisting of $N$ two-level systems or spins interacting with two photonic cavity modes, where one of the modes is in the dispersive regime. In contrast to Dicke batteries, the power enhancement arises from a $N^2$ scaling of both quantum correlations and speed of evolution, thus highlighting genuine quantum advantage. Moreover, this hybrid setup is experimentally realizable and ensures that power enhancement is not achieved at significant cost to energy efficiency, while allowing for greater tunability and stable operation in the presence of noise.