On December 16th, 2024 Michele Fantechi (XXXVII cycle) successfully defended his PhD dissertation, earning a PhD degree in Mathematical Models and Methods in Engineering. Congratulations!
Title of the PhD Thesis: Effective Models for Quantum Systems Interacting with Quasi-Classical Reservoirs
Advisors: prof. Michele Correggi and prof. Marco Falconi (Politecnico di Milano)
Area of Mathematics: Mathematical Physics
PhD Committee Members: prof. Fermi Davide (Politecnico di Milano), prof. Paolo Facchi (Università degli Studi di Bari Aldo Moro), prof. Jan Jonas Lampart (Université de Bourgogne)
In his thesis, Michele Fantechi studied effective models for open quantum systems in the quasi-classical regime. He examined two paradigmatic models, namely, the spin-boson model and the Caldeira-Leggett model, where small quantum systems are coupled to a bosonic quantum field in a configuration with a large number of excitations (quasi-classical limit). Especially, he quantitatively analyzed the phenomenon of decoherence and the emergence of non-Markovianity as a result of the interplay between the infrared coupling and the specific choice of states for the bosonic reservoir.