Enhancing Otto-mobile efficiency via addition of a quantum Carnot cycle
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abstract
It was shown recently that one can improve the efficiency of the Otto cycle by taking advantage of the internal degrees of freedom of an ideal gas [M. O. Scully, "The Quantum Afterburner", Phys. Rev. Lett., to be published]. Here we discuss the limiting improvement of the efficiency by considering reversible cycles with both internal and external degrees of freedom.