Theoretische Physik III: Dynamics in correlated quantum matter

In our research we are interested in the dynamics of correlated quantum matter at the interface between quantum many-body theory, nonequilibrium physics, quantum information science, and machine learning. The research covers the development of a theory of dynamical quantum phase transitions, the dynamics in lattice gauge theories, the exploration of machine learning techniques as a new toolbox in quantum many-body theory, many-body localization in interacting strongly disordered systems, or entanglement in correlated quantum matter.

 

Below you can find a selection of recent research conducted in this group.

 

The full list of publications of the chair can be found here.

News

9. September 2021

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...

Weiterlesen
27. Juli 2021

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.

Weiterlesen
1. April 2021

Paper: Disorder-Free Localization in an Interacting 2D Lattice Gauge Theory

Disorder-free localization has been recently introduced as a mechanism for ergodicity breaking in low-dimensional homogeneous lattice gauge theories caused by local constraints imposed by gauge invariance. We show that also genuinely interacting systems in two spatial dimensions can become nonergodic as a consequence of this mechanism.

Weiterlesen
2. September 2020

Paper: Quantum Many-Body Dynamics in Two Dimensions with Artificial Neural Networks

The efficient numerical simulation of nonequilibrium real-time evolution in isolated quantum matter constitutes a key challenge for current computational methods. This holds in particular in the regime of two spatial dimensions, whose experimental exploration is currently pursued with strong efforts in quantum simulators. In this work we present a versatile and efficient machine learning inspired approach based on a recently introduced artificial neural network encoding of quantum many-body wave functions.

Weiterlesen
12. April 2019

Paper: Quantum localization bounds Trotter errors in digital quantum simulation

A fundamental challenge in digital quantum simulation (DQS) is the control of an inherent error, which appears when discretizing the time evolution of a quantum many-body system as a sequence of quantum gates, called Trotterization. Here, we show that quantum localization-by constraining the time evolution through quantum interference-strongly bounds these errors for local observables, leading to an error independent of system size and simulation time.

Weiterlesen
19. Januar 2018

Paper: Many-Body Localization Dynamics from Gauge Invariance

We show how lattice gauge theories can display many-body localization dynamics in the absence of disorder. Our starting point is the observation that, for some generic translationally invariant states, the Gauss law effectively induces a dynamics which can be described as a disorder average over gauge superselection sectors.

Weiterlesen

Allgemeine Kontaktinformationen:

Anschrift: Universitätsstraße 1 (Physik Süd), 86159 Augsburg
Telefon: +49-(0)-821-598-3701 (Sekretariat)

Fax: +49-(0)-821-598-3725

E-Mail: angelika.abendroth@physik.uni-augsburg.de

Gebäude/Raum: 410 (S)

© Universität Augsburg

Suche