Entangled quantum Unruh Otto engine is more efficient

We propose a relativistic quantum Otto cycle between an entangled state of two qubits and their composite excited (or ground) whose efficiency can be greater than the usual single qubit engine. The hot cold reservoirs are constructed by providing uniform accelerations to these along with interaction background field individual qubits. efficiency, as measured from one qubits' frame, not only depends on energy gap states but also relative acceleration them. For lower our observer's compared other one, is more efficient Furthermore, complete protocol construct such being provided.