Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 49: Poster – Photonics, Lasers, and Applications

Q 49.38: Poster

Mittwoch, 12. März 2025, 17:00–19:00, Tent

Violating the thermodynamic uncertainty relation in the three-level laser — •Sander Stammbach — Universität Basel, Basel, Schweiz

Heat engines are devices that convert thermal energy into useful work under continuous, cyclic operation. The prime example of a quantum heat engine is the three-level laser (or maser) [1]: an incoherent pump process plays the role of a heat reservoir, providing thermal energy to create a population inversion. At the same time, the lasing transition leads to useful work output in the form of stimulated emission into a coherent driving field that is usually treated as a time-dependent coherent amplitude. Here, we consider a model in which the three-level system is placed in a single-mode cavity that is externally driven by coherent light. Making use of the framework of full counting statistics [2], we investigate the fluctuating energy currents of the system as a function of the drive. We also evaluate the thermodynamic uncertainty relation (TUR) [3] and identify the quantum regimes of operation in which its classical bound can be violated. In previous studies without cavity, these regimes could result in an enhanced output power, i.e., a quantum advantage. Our findings suggest that this is no longer the case in a cavity.

Keywords: Quantenthermodynamik; Quanten Optik; Laser; Heatengine; thermodynamic uncertainty relation