Quantum Otto cycle in a superconducting cavity in the nonadiabatic regime

We analyze the efficiency of quantum Otto cycle applied to a superconducting cavity. consider its description in terms full scalar field one-dimensional cavity with time dependent boundary condition that can be externally controlled perform and extract work unitarily from system. study performance this machine when acting as heat engine well refrigerator. It is shown that, non-adiabatic regime, affected by dynamical Casimir effect, induces sort friction diminishes efficiency. also find regions parameters where effect so strong no longer function an since would produced completely consumed friction. However, avoided for some particular temporal evolutions conditions do not change occupation number modes cavity, leading highly improved