Dr. Konstantin Nestmann

Dr. Konstantin Nestmann

Postdoctoral researcher in Physics

RWTH Aachen

I recently completed my PhD in theoretical physics at RWTH Aachen University, where I currently also work as a postdoctoral researcher. My research focuses on various aspects of open quantum systems from both a quantum information and a statistical physics perspective.

Interests
  • Non-perturbative quantum master equations
  • Quantum non-Markovianity
  • Quantum Thermodynamics
Education

  • PhD in Physics summa cum laude
    (with Prof. M. R. Wegewijs), 2018 - 2022

    RWTH Aachen University

  • MSc in Physics (with Prof. C. Timm), 2018

    Dresden University of Technology

  • BSc in Physics (with Prof. C. Timm), 2015

    Dresden University of Technology

Publications

K. Nestmann
July, 2022 Dissertation
Open Quantum Systems: Time (non)-locality, Fixed Points, and Renormalization Groups
Open Quantum Systems: Time (non)-locality, Fixed Points, and Renormalization Groups

In my doctoral thesis I considered the dynamics of open quantum systems from the quite different perspectives of quantum information theory and statistical physics.
PDF DOI
K. Nestmann, M. R. Wegewijs
April, 2022 SciPost Phys. 12, 121
Renormalization group for open quantum systems using environment temperature as flow parameter
Renormalization group for open quantum systems using environment temperature as flow parameter

We develop the $T$-flow renormalization group scheme to access the low-temperature many-body physics of open quantum systems by literally lowering the temperature of the environment.
PDF Cite DOI
K. Nestmann, V. Bruch, M. R. Wegewijs
May, 2021 Phys. Rev. X 11, 021041
How quantum evolution with memory is generated in a time-local way
How quantum evolution with memory is generated in a time-local way

We establish that the general connection between time-local and non-local quantum master equations is a simple yet general fixed-point equation with far reaching applications.
→ See press releases by RWTH Aachen, FZ Jülich and JARA

PDF Cite DOI
SEE ALL PUBLICATIONS

Teaching

Lead teaching assistant (creating exercise sheets, organizing sections):

  • Quantum Information (Prof. David DiVincenzo and Prof. Maarten Wegewijs)
  • Introduction to Theoretical Physics (Prof. Dante Kennes)

Teaching assistant:

  • Statistical Physics (Prof. Volker Meden)
  • Quantum Mechanics (Prof. Volker Meden; Prof. Fabian Hassler)

Contact