Quantum mechanical bound for efficiency of quantum Otto heat engine

Jong Min Park, Sangyun Lee, Hyun Myung Chun, Jae Dong Noh

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The second law of thermodynamics holds that the efficiency of heat engines, classical or quantum, cannot be greater than the universal Carnot efficiency. We discover another bound for the efficiency of a quantum Otto heat engine consisting of a harmonic oscillator. Dynamics of the engine is governed by the Lindblad equation for the density matrix, which is mapped to the Fokker-Planck equation for the quasiprobability distribution. Applying stochastic thermodynamics to the Fokker-Planck equation system, we obtain the -dependent quantum mechanical bound for the efficiency. It turns out that the bound is tighter than the Carnot efficiency. The engine achieves the bound in the low-temperature limit where quantum effects dominate. Our work demonstrates that quantum nature could suppress the performance of heat engines in terms of efficiency bound, work, and power output.

Original languageEnglish
Article number012148
JournalPhysical Review E
Issue number1
StatePublished - 30 Jul 2019


Dive into the research topics of 'Quantum mechanical bound for efficiency of quantum Otto heat engine'. Together they form a unique fingerprint.

Cite this