ZAGOSKIN, A.M., ... et al., 2012. Squeezing as the source of inefficiency in the quantum Otto cycle. Physical Review B, 86 (1), 7 pp.
The availability of controllable macroscopic devices, which maintain quantum coherence over relatively long
time intervals, for the first time allows an experimental realization of many effects previously considered only as
gedanken experiments, such as the operation of quantum heat engines. The theoretical efficiency η of quantum
heat engines is restricted by the same Carnot boundary ηC as for the classical ones: any deviations from quasistatic
evolution suppressing η below ηC. Here we investigate an implementation of an analog of the Otto cycle in a
tunable quantum coherent circuit and show that the specific source of inefficiency is the quantum squeezing of
the thermal state due to the finite speed of compression/expansion of the system.