Entanglement-assisted charging of quantum batteries within optomechanical framework

In this study, we propose an optomechanical cavity as a promising platform for charging a quantum battery embedding two two-level atoms. We assume the atoms and the single optical mode are initialized in their corresponding ground states while the mechanical resonator can be either in vacuum or its first excited state. Our findings reveal a remarkable correspondence between the generated entanglement between the atoms and the ergotropy of the quantum battery, i.e., the available energy by unitary operations. This observation of such a high degree of similarity between entanglement and ergotropy seems to be unprecedented. Furthermore, both linear and nonlinear optomechanical couplings are shown to enhance ergotropy provided being properly adjusted. Additionally, we examine the statistical properties of the optical and mechanical modes using the Mandel parameter. Our results indicate that the nonclassicality of the optical mode significantly boosts the available energy. In contrast, less negative Mandel parameter values, reflecting decreased nonclassicality, are preferable to assist the charging process. These insights suggest the possibility of using quantum features to optimize the efficiency of quantum batteries.