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We study how the thermalization time of a single radiation cavity-field modechanges drastically depending on the type of the atomic reservoir it interacts.Temporal evolution of the field is analyzed within the micromaser scheme, whereeach atomic reservoir is modeled as a beam of atoms crossing an electromagneticcavity in which they weakly interact with the field. The cavity-fieldthermalizes when we consider either multi-atom or multi-level atom reservoirs.We found that each atomic reservoir generates a different scaling law in thethermalization time of the cavity-field. Such scaling laws can be used for afaster or slower heating and cooling process. We have obtained analyticalexpressions for the thermalization time that were verified by means of anumerical simulation of the injection of each atomic reservoir into the cavity.We also discussed how our results could boost the efficiency and power outputof some quantum heat engines during a finite time operation when the radiationfield mode acts as the working substance.

Tailoring the thermalization time of a cavity-field using distinct atomic reservoirs