Quantum battery optimized by parametric amplification

TL;DR

This paper proposes a superconducting circuit-based quantum battery scheme enhanced by two-photon parametric amplification, leading to increased charging power, stability, and robustness against noise.

Contribution

It introduces a novel quantum battery design utilizing two-photon-driven LC resonators and transmon qubits, with exponential coupling enhancement and decoherence suppression.

Findings

Exponential enhancement of cavity-qubit coupling due to two-photon driving

Significant increase in charging power and rapid energy transfer

Suppression of decoherence and energy leakage, ensuring stable energy storage

Abstract

The parametric amplification enabled by two-photon driving constitutes a versatile platform for advanced quantum technologies. We present an optimized scheme for implementing quantum batteries (QBs) based on a superconducting circuit system, where a two-photon-driven LC resonator serves as the charger and an array of transmon qubits functions as the battery. Our results show that two-photon parametric driving exponentially enhances the effective cavity-qubit coupling, which in turn gives rise to near-degenerate energy-level structures and highly entangled quantum states. This significantly enhances the charging power and enables rapid energy transfer from the charger to the battery. Moreover, the engineered squeezed cavity mode and the associated quantum correlations effectively suppress environmentally induced decoherence, thereby delaying energy leakage and facilitating stable energy storage. The proposed scheme remains robust against practical experimental imperfections, such as parameter disorder and environmental noise, preserving its performance advantages. The work provides a feasible platform for realizing high-power, high-stability QBs and highlights the potential of parametric control in quantum energy technologies.