Cavity-optomechanical quantum battery

We propose a hybrid-system quantum battery model composed of cavity quantum electrodynamics (QED) and optomechanics, which is called a cavity-optomechanical quantum battery (COQB). The single two-level system (TLS) serves as a quantum battery, which is influenced by a mechanical oscillator through a cavity mode. When the TLS is coupled with cavity mode in the Jaynes-Cummings (JC) model and the initial number of photons is 0, it is impossible to achieve the charging and discharging process. We exhibit three different methods to achieve the feasibility of the COQB and analyze the role of oscillator in the different scenarios. In the closed system, the cavity mode and TLS are coupled in the Rabi model. For the two different environments, the cavity mode is coupled with a thermal bath or driven by a coherent driving field. The existence of an oscillator in both the closed and open dynamics demonstrates advantages in the stored energy and ergotropy.