Abstract
The second law of thermodynamics has been proven by many facts in classicalworld. Is there any new property of it in quantum world? In this paper, wecalculate the change of entropy in T.D. Kieu's model for quantum heat engine(QHE) and prove the broad validity of the second law of thermodynamics. Itis shown that the entropy of the quantum heat engine neither decreases in awhole cycle, nor decreases in either stage of the cycle. The second law ofthermodynamics still holds in this QHE model. Moreover, although themodified quantum heat engine is capable of extracting more work, itsefficiency does not improve at all. It is neither beyond the efficiencyof T.D. Kieu's initial model, nor greater than the reversible Carnot efficiency.
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