Santos, Jonas F.G.Luiz, Fabricio S. [UNESP]2022-04-282022-04-282021-08-01Journal of Physics A: Mathematical and Theoretical, v. 54, n. 33, 2021.1751-81211751-8113http://hdl.handle.net/11449/222146We present results concerning aspects of quantum thermodynamics under the background of non-Hermitian quantum mechanics for the dynamics of a quantum harmonic oscillator. Since a better control over the parameters in quantum thermodynamics processes is desired, we use concepts from collisional model to introduce a simple prototype of thermal reservoir based on PT -symmetric Hamiltonians and study its effects under the thermalization process of a single harmonic oscillator prepared in a displaced thermal state. We verify that controlling the PT -symmetric features of the reservoir allows to reverse the heat flow between system and reservoir, as well as to preserve the coherence over a longer period of time and reduce the entropy production. Furthermore, we considered a modified quantum Otto cycle in which the standard hot thermal reservoir is replaced by the thermal reservoir based on PT -symmetric Hamiltonians. By defining an effective temperature depending on the PT -symmetric parameter, it is possible to interchange the quantum Otto cycle configuration from engine to refrigerator by varying the PT -symmetric parameter. Our results indicate that PT -symmetric effects could be useful to achieve an improvement in quantum thermodynamics protocols such as coherence protection and entropy production reduction.engNon-Hermitian quantum mechanicsPT-symmetryQuantum thermodynamicsArtigo10.1088/1751-8121/ac13de2-s2.0-85112082170