Comment on `Quantum-mechanical Carnot engine'

The equations governing adiabatic and isothermal quantum processes involved in an ideal two-state quantum heat engine are modified when the ideality restriction is removed. We seek and study a few situations to determine the nature and magnitude of the modifications. If one confines such systems well within the classical turning point, we show how one can profitably employ the Wilson-Sommerfeld quantization rule to estimate the leading correction terms due to non-ideality. The endeavour is likely to be important in studies on practical quantum engines.