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 r estriction is removed. We seek and study a few situations to determine the nature and magnitude of the modifications. If one confines such systems wel l 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 stud ies on practical quantum engines.