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A quantum model of a heat engine resembling the Otto cycle is employed toexplore strategies to suppress frictional losses. These losses are caused bythe inability of the engine's working medium to follow adiabatically the changein the Hamiltonian during the expansion and compression stages. By addingexternal noise to the engine, frictional losses can be suppressed.Comment: references added some minor change

Quantum lubrication: Suppression of friction in a first-principles four-stroke heat engine