Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 60: Cryotechnique: Refrigeration and Thermometry

TT 60.7: Hauptvortrag

Donnerstag, 19. März 2020, 16:45–17:15, HSZ 103

Heat and Work Fluctuations in a Quantum Heat Engine — Timo Kerremans, Peter Samuelsson, and •Patrick P. Potts — Physics Department and Nanolund, Lund University, Sweden

The fluctuations of thermodynamic observables shed insight into the non-classical nature of quantum thermal machines, paving the way for developing novel quantum technologies. I will present a detailed case study of heat and work fluctuations in the heat engine proposed in [Phys. Rev. B 93, 041418(R)]. As a thermo-electric device, work fluctuations are directly linked to electrical current fluctuations, circumventing any ambiguity in defining work as a fluctuating quantity in the quantum regime. We find that while heat fluctuations can be described classically, the work fluctuations either require a quasi-probabilistic description, or an explicit description of the measurement process. The non-classicality of the work fluctuations implies that the first law of thermodynamics cannot be formulated for a single experimental run. This is in stark contrast to classical fluctuating systems, where only the second law may be violated for single runs.