title: Extraction of work from a single thermal bath in the quantum regime
abstract: The stationary state of a quantum particle strongly coupled to a quantum thermal bath is known to be non-Gibbsian, due to entanglement with the bath. For harmonic potentials, where the system can be described by effective temperatures, thermodynamic relations are shown to take a generalized Gibbsian form that may violate the Clausius inequality. For the weakly anharmonic case, a Fokker-Planck-type description is constructed. It is shown that then work can be extracted from the bath by cyclic variation of a parameter. These apparent violations of the second law are the consequence of quantum coherence in the presence of the slightly off-equilibrium nature of the bath.
authors.affiliation: CEA/Saclay, Service de Physique Theorique, F-91191 Gif-sur-Yvette Cedex, France and Institute for Theoretical Physics, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands and Yerevan Physics Institute, Alikhanian Brot.
authors.initials: AE
authors.lastname: Allahverdyan
authors.initials: TM
authors.lastname: Nieuwenhuizen