Ultrafast charging quantum battery with cavity–cavity interactions

We present a quantum battery model comprising two lossless cavities that interact through a controlled photon–hopping mechanism, each housing an isolated two-level atom. This study explores the possibility of influencing the interaction between cavities within the traditional two single–cavity working modes, thereby paving the way for enhanced charging performance. By solving the generalized double Jaynes–Cummings model with cavity–cavity interactions, we demonstrate the positive impact of such interactions on battery charging, enabling the quantum battery to outperform the single–cavity case in terms of charging time and average charging power. Additionally, we investigate the influence of different cavity–cavity interaction strengths on charging efficiency and attempt to explain the underlying mechanisms by analyzing the entanglement within the system.