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