Theoretical Physics III: Correlated quantum matter
Dynamics of correlated quantum matter
The dynamics of correlated quantum matter represents a key frontier in quantum physics. In our research we contribute to this frontier along two main axes. Firstly, we aim to explore novel universal behaviors, dynamical principles, and phases of matter in such dynamical quantum many-body systems, mostly far beyond equilibrium. In particular, we focus on identifying settings where the system's properties are genuinely quantum with no classical analogue. Secondly, our goal is to target the challenge of theoretically describing such nonequilibrium quantum systems. For that purpose we apply a broad class of methods ranging from purely analytical approaches to machine learning algorithms such as neural quantum states.
Strongly Correlated Light and Matter
Our research field lies at the boundary between quantum optics and condensed-matter physics. We are especially interested in collective phenomena arising in quantum open systems and more generally out of equilibrium, and their possible applications in the control of quantum materials functionalities as well quantum nonlinear optics. Currently, our main focus is on recent experiments implementing a novel, non-relativistic regime of Quantum Electrodynamics (QED) within quantum materials. A reliable description of this many-body problem is very challenging and being currently developed. We adopt tailored field-theoretical approaches, which extend methods from condensed matter and quantum optics theory, merging them into a consistent, comprehensive and flexible framework.
Quantum hard disks on a lattice
Machine learning solves complex quantum problems
Due to a new method, artificial neural networks, as used in machine learning, will be able to be trained quicker so as to be able to solve complex problems in quantum mechanics. For example, previously unexplained properties of a special state of matter, the quantum spin liquid, can be calculated, something that has not been possible with any previous method to date. This has been made possible by a new optimisation method developed by the Institute of Physics.
Honorary doctorate for Prof. Dieter Vollhardt
Prof. Dieter Vollhardt was awarded an honorary doctorate by the University of Warsaw last week in recognition of his scientific achievements and longstanding collaboration with theoretical physicists at the University of Warsaw.
Leading quantum mechanical research
The Centre for Electronic Correlations and Magnetism (EKM) was established in the early 1990s. Since then, it has become a top research institute in the field of quantum mechanics. The meeting of the scientific advisory board of the EKM in Augsburg, composed of leading experts in the field, confirms this.
Paper: Reinforcement Learning for Digital Quantum Simulation
Digital quantum simulation on quantum computers provides the potential to simulate the unitary evolution of any many-body Hamiltonian with bounded spectrum by discretizing the time evolution operator through a sequence of elementary quantum gates. A fundamental challenge in this context originates from experimental imperfections, which critically limits the number of attainable gates...
Paper: Unitary Long-Time Evolution with Quantum Renormalization Groups and Artificial Neural Networks
In this work, we combine quantum renormalization group approaches with deep artificial neural networks for the description of the real-time evolution in strongly disordered quantum matter. We find that this allows us to accurately compute the long-time coherent dynamics of large many-body localized systems in nonperturbative regimes including the effects of many-body resonances.
Contact information:
Address: Universitätsstraße 1 (Physik Süd), 86159 Augsburg
Telefon: +49-(0)-821-598-3701 (Secretary’s office)
Fax: +49-(0)-821-598-3725
E-Mail: angelika.abendroth@physik.uni-augsburg.de
Office: 410 (S)
