Cyclic solid-state quantum battery: Thermodynamic characterization and quantum hardware simulation

TL;DR

This paper proposes a cyclic quantum battery model using interacting qubits, demonstrating enhanced efficiency through quantum coherence and correlations, and validates it via simulation on superconducting quantum hardware.

Contribution

It introduces a novel cyclic quantum battery scheme with a practical superconducting circuit implementation and experimental validation on IBM quantum computers.

Findings

Achieves over 50% efficiency in quantum battery cycles.

Shows quantum coherence and correlations enhance energy extraction.

Demonstrates feasibility of implementation on superconducting quantum hardware.

Abstract

We introduce a cyclic quantum battery model, based on an interacting bipartite system, weakly coupled to a thermal bath. The working cycle of the battery consists of four strokes: system thermalization, disconnection of subsystems, ergotropy extraction, and reconnection. The thermal bath acts as a charger in the thermalization stroke, while ergotropy extraction is possible because the ensuing thermal state is no longer passive after the disconnection stroke. Focusing on the case of two interacting qubits, we show that phase coherence, in the presence of non-trivial correlations between the qubits, can be exploited to reach working regimes with efficiency higher than 50% while providing finite ergotropy. Our protocol is illustrated through a simple and feasible circuit model of a cyclic superconducting quantum battery. Furthermore, we simulate the considered cycle on superconducting IBM quantum machines. The good agreement between the theoretical and simulated results strongly suggests that our scheme for cyclic quantum batteries can be successfully realized in superconducting quantum hardware.