  Uniformly accelerated frame mimics a thermal bath whose temperature is
proportional to the proper acceleration. Using this phenomenon we give a
detailed construction of an Otto cycle between two energy eigenstates of a
system, consists of two entangled qubits. In the isochoric stages the thermal
bath is being provided via the vacuum fluctuations of the background field for
a monopole interaction by accelerating them. We find that making of Otto cycle
is possible when one qubit is accelerating in the right Rindler wedge and other
one is moving in the left Rindler wedge; i.e. in anti-parallel motion, with the
initial composite state is a non-maximally entangled one. However, the
efficiency greater than that of the usual single qubit quantum Otto engine is
not possible. We provide values of the available parameters which make Otto
cycle possible. On the other hand, Otto cycle is not possible if one considers
the non-maximally entangled state for parallel motion. Moreover, for both
initial symmetric and anti-symmetric Bell states we do not find any possibility
of the cycle for qubits' parallel and anti-parallel motion.
