Superconducting transmon qubit-resonator quantum battery

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 has 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.

Automated summary

In this paper, an implementation scheme of a quantum battery (QB) based on a superconducting circuit is proposed. The QB consists of N coupled transmon qubits and a one-dimensional transmission line resonator. The Hamiltonian of the QB system is derived and its charging performance is investigated by considering three decay channels. It is found that the presence of decay channels suppresses the high oscillation of the energy storage process, leading to a stable and powerful QB.