Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 47: Open Quantum Systems

Q 47.5: Vortrag

Donnerstag, 14. März 2024, 12:00–12:15, HS 3219

Collision models from the perspective of fast scattering events — •Michael Gaida and Stefan Nimmrichter — Universität Siegen, Deutschland

A collision model is a blueprint for generic opensystems in which the environment is modeled as a sequence of ancillas unitarily interacting with the system. It can be viewed as a mathematical idealization of scattering processes in which kinetics are reduced to a mere swichting on and off of the interaction. Such models are capable of describing thermalization processes if one restricts to energy preserving interaction terms, but the link to dynamical scattering models with both internal and motional degrees of freedom remains to be explored. Recently this link has been investigated in a one-dimensional setting [1, 2]. Here we consider two and three-dimensional scenarios and study under which conditions they can be described by collision models, once the motional degrees of freedom are averaged out. Specifically, we focus on (non-relativistic) high energy scattering and the energy exchange between internal and kinetic energy. We identify the parameter regimes and interaction types that lead to Gibbsian or non-Gibbsian equilibrium state of the internal degrees of freedom.

[1] S. L. Jacob, M. Esposito, J. M. R. Parrondo, and F. Barra, Quantum scattering as a work source, Quantum 6, 750 (2022).

[2] S. L. Jacob, M. Esposito, J. M. Parrondo, and F. Barra, Thermalization induced by quantum scattering, PRX Quantum 2, 020312 (2021).

Keywords: Collision models; Scattering; decoherence