  We propose a quantum Otto cycle based on the properties of a two-level system
in a realistic out-of-thermal-equilibrium electromagnetic field acting as its
sole reservoir. This steady configuration is produced without the need of
active control over the state of the environment, which is a non-coherent
thermal radiation, sustained only by external heat supplied to macroscopic
objects. Remarkably, even for non-ideal finite-time transformations, it largely
over-performs the standard ideal Otto cycle, and asymptotically achieves unit
efficiency at finite power.
