45:04
published on April 18, 2025
Quantum Galilei group as quantum reference frame transformations
By Giulia Gubitosi
Many-body quantum heat engines based on free-fermion systems
Appears in collection : 2024 - T1 - WS1 - Quantum simulators
We study the thermodynamics of free-fermion systems coupled to quantum thermal baths within a Markovian approximation. In particular, we construct a four-stroke quantum Otto engine by alternately coupling such kind of systems to two reservoirs at different temperatures and operating adiabatic switches of some Hamiltonian parameters, followed by isochoric transformations.
We show that the engine can operate in four different modes; in particular it can act as a heat engine and as a refrigerator, with thermodynamic performances that are affected by the possible presence of quantum criticality in the model. We also discuss the effects of non perfect thermalization with the baths and of adiabatic processes which are executed in a finite width of time.
