# SKM 2023 – wissenschaftliches Programm

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# DY: Fachverband Dynamik und Statistische Physik

## DY 34: Statistical Physics: Far From Equilibrium II

### DY 34.3: Vortrag

### Mittwoch, 29. März 2023, 17:15–17:30, ZEU 250

**Quantum and classical contributions to entropy production in fermionic and bosonic Gaussian systems** — •Krzysztof Ptaszyński^{1,2} and Massimiliano Esposito^{2} — ^{1}Institute of Molecular Physics, Polish Academy of Sciences, Mariana Smoluchowskiego 17, 60-179 Poznań, Poland — ^{2}Complex Systems and Statistical Mechanics, Physics and Materials Science Research Unit, University of Luxembourg, L-1511 Luxembourg, Luxembourg

As previously demonstrated, the entropy production -- a key quantity characterizing the irreversibility of thermodynamic processes -- is related to generation of correlations between degrees of freedom of the system and its thermal environment. The natural question appears whether such correlations are of a classical or a quantum nature, namely, whether they are accessible through measurements. We deal with this problem by investigating fermionic and bosonic Gaussian systems. It is shown that for fermions the entropy production is mostly quantum due to parity superselection rule which restricts the set of physically allowed measurements to projections on the Fock states, which significantly limits the amount of classically accessible correlations. In contrast, in bosonic systems a much larger amount of correlations can be accessed through Gaussian measurements. Specifically, while quantum contribution may be important at low temperatures, in the high temperature limit the entropy production corresponds to purely classical position-momentum correlations.