Bonn 2025 – scientific programme

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QI: Fachverband Quanteninformation

QI 38: Quantum Thermodynamics

QI 38.4: Talk

Friday, March 14, 2025, 11:45–12:00, HS IX

Consistent Clausius inequality and its typical positivity for pure states — •Philipp Strasberg — Instituto de Física de Cantabria (IFCA), Santander, Spain

I show how to consistently derive Clausius inequality, in unison with textbook thermodynamics but in conflict with some recent suggestions in quantum thermodynamics, using a microscopic notion of entropy and temperature. While its strict non-negativity can only be established for a specific initial ensemble, I also show how dynamical typicality ensures that the overwhelming majority of pure states behaves like said ensemble. While the talk focuses on the archetypal example of two systems exchanging heat, the results are general and applicable to a much wider range of scenarios.

Keywords: Clausius inequality; pure state statistical mechanics; entropy; dynamical typicality; entropy production