Welcome to the Group Theoretical Physics 2

Prof. Dr. Kathy LüdgeAnLi Fotografie

Head of Group

Univ.-Prof. Dr. rer. nat. (habil.) Kathy Lüdge

Secretarys office:

Dagmar Böhme

Tel.: +49 (0) 3677 69 3706


Curiebau, Zi. 320

Postal address:

Technische Universität Ilmenau
Faculty of Mathematics and Natural Sciences
Institute of Physics
Group Theoretical Physics 2
P.O. Box 10 05 65
98684 Ilmenau

Visiting address:

Weimarer Straße 25
98693 Ilmenau


We investigate dynamic instabilities caused by optical feedback, optical injection or mode coupling in lasers. The charge carrier dynamics in the amplifier material (e.g. semiconductor nanostructures) play a central role here. Another research topic concerns the extent to which these optical systems can be used for hardware-based machine learning. We use numerical methods to solve coupled differential equations as well as analytical methods of nonlinear dynamics for bifurcation analysis. Reservoir computing is a method of machine learning that can be easily implemented in hardware and is being intensively investigated in the working group. In the project NeurosensEarNeuromorphic acoustic sensor technology for powerful hearing aids of tomorrow, funded by the Carl-Zeiss Foundation, we are investigating micro-mechanical resonators as in-sensor reservoir computers."

Foto Licht Materie Wechselwirkung Kathy Lüdge

Invited conference papers

Bild KupplungsstärkeTheoretische Physik 2 - Kathy Lüdge


Cindrak, S.; Donvil, B.; Lüdge, K.; Jaurigue, L. "Enhancing the performance of quantum reservoir computing and solving the time-complexity problem by artificial memory restriction" In Phys. Rev. Research 6, 013051, 2024

Thurn, A.; Bissinger, J.; Meinecke, S.; Schmiedeke, P.; Soon Oh, S.; Chow, W.; Lüdge, K.; Koblmüller, G.; Finley, J. Self-Induced Ultrafast Electron-Hole-Plasma Temperature Oscillations in Nanowire Lasers In Phys. Rev. Applied 20, 034045, 2023 Köster, F.; Patel, D.; Wikner, A.; Jaurigue, L.; Lüdge, K. Data-informed reservoir computing for efficient time-series prediction In: Chaos, 33, Issue 7, 2023

Meinecke, S.; Köster, F.; Christiansen, D.; Lüdge, K.; Knorr, A.; Selig, M. Data-driven forecasting of nonequilibrium solid-state dynamics In: Phys. Rev. B 107, 184306, 2023

all publications

TU Ilmenau / Michael Reichel (ari)


The group Theoretical Physics 2 offers courses in the framework of the course Technical Physics. This concerns the three Bachelor modules:

Theoretical Physics 1 Theoretical Physics 2 Theoretical Physics 3

as well as the Master modules:

Theoretical Physics, Numerics and Simulation Module Physics of Complex Systems.