Superconducting transmon qubit-resonator quantum battery

TL;DR

This paper proposes a superconducting circuit-based quantum battery using coupled transmon qubits and a resonator, analyzing its stability, power, and effects of decay channels, with potential for experimental realization.

Contribution

It introduces a novel superconducting circuit design for a quantum battery and analyzes its charging performance considering decay channels and interactions.

Findings

Decay channels suppress energy oscillations, stabilizing the quantum battery.

Qubit dephasing can have an advantage over other decay channels.

Nearest neighbor interactions enhance stable energy storage.

Abstract

Quantum battery (QB) is the miniature energy storage and release device and plays a crucial role in future quantum technology. Here, an implementation scheme of a QB is proposed on a superconducting circuit which is composed by $N$ coupled transmon qubits and a one-dimensional transmission line resonator. We derive the Hamiltonian of the QB system and investigate its charging performance by considering three decay channels. We find that the presence of the decay channels suppresses the high oscillation of the energy storage process, thereby realizing a stable and powerful QB. In particular, compared with the resonator decay and the qubit relaxation, the qubit dephasing shows a counterintuitive advantage in our QB. We show that the nearest neighbor interaction always have a positive impact on the stable energy and the coupling only significantly influences the maximum charging power in the fully nondegenerate ground state region. We also demonstrate the feasibility of our approach by evaluating the QB performance under experimental parameters.