Journal articles

This is a list of all journal articles. For other publication types, see all publications.

2024

Thouless pumping in Josephson junction arrays

Recent advancements in fabrication techniques have enabled unprecedented clean interfaces and gate tunability in …

Simulations of the dynamics of quantum impurity problems with matrix product states

The Anderson impurity model is a paradigmatic example in the study of strongly correlated quantum systems and describes an interacting …

2023

Topological Kondo model out of equilibrium

The topological Kondo effect is a genuine manifestation of the nonlocality of Majorana modes. We investigate its out-of-equilibrium …

Matrix models and holography: Mass deformations of long quiver theories in 5d and 3d

We enlarge the dictionary between matrix models for long linear quivers preserving eight supercharges in $d=5$ and $d=3$ and type IIB …

Eichtheorien im Quantensimulator

Gauge theories form the theoretical foundation of our understanding of many fields of science, in particular elementary particle …

The holographic map of an evaporating black hole

We construct a holographic map that takes the semi-classical state of an evaporating black hole and its Hawking radiation to a …

Quantum approximate optimization algorithm for qudit systems

A frequent starting point of quantum computation platforms is the two-state quantum system, i.e., the qubit. However, in the context of …

Universal equilibration dynamics of the Sachdev-Ye-Kitaev model

Equilibrium quantum many-body systems in the vicinity of phase transitions generically manifest universality. In contrast, limited …

Massive flows in AdS$_6$/CFT$_5$

We study five-dimensional $N=1$ Superconformal Field Theories of the linear quiver type. These are deformed by a relevant operator, …

Engineering random spin models with atoms in a high-finesse cavity

All-to-all interacting, disordered quantum many-body models have a wide range of applications across disciplines, from spin glasses in …

Quantum routing of information using chiral quantum walks

We address routing of classical and quantum information over quantum network and show how to exploit chirality (directionality) to …

Dynamics of Stripe Patterns in Supersolid Spin–Orbit-Coupled Bose Gases

Despite ground-breaking observations of supersolidity in spin–orbit-coupled Bose–Einstein condensates, until now the …

Critical slowing down in sudden quench dynamics

We reveal a prethermal dynamical regime upon suddenly quenching to the vicinity of a quantum phase transition in the time evolution of …

Detecting quantum phase transitions in the quasistationary regime of Ising chains

Recently, single-site observables have been shown to be useful for probing critical slowing down in sudden quench dynamics Dağ et al., …

Absence of operator growth for average equal-time observables in charge-conserved sectors of the Sachdev-Ye-Kitaev model

Quantum scrambling plays an important role in understanding thermalization in closed quantum systems. By this effect, quantum …

Reliability of lattice gauge theories in the thermodynamic limit

Although gauge invariance is a postulate in fundamental theories of nature such as quantum electrodynamics, in quantum-simulation …

2022

Achieving the quantum field theory limit in far-from-equilibrium quantum link models

Realizations of gauge theories in setups of quantum synthetic matter open up the possibility of probing salient exotic phenomena in …

Genuine multipartite entanglement in a one-dimensional Bose-Hubbard model with frustrated hopping

Frustration and quantum entanglement are two exotic quantum properties in quantum many-body systems. However, despite several efforts, …

Towards the continuum limit of a $(1+1)$d quantum link Schwinger model

The solution of gauge theories is one of the most promising applications of quantum technologies. Here, we discuss the approach to the …

Quantum phases of dipolar bosons in multilayer optical lattice

We consider a minimal model to investigate the quantum phases of hardcore, polarized dipolar atoms confined in multilayer optical …

Entanglement Witnessing for Lattice Gauge Theories

Entanglement is assuming a central role in modern quantum many-body physics. Yet, for lattice gauge theories its certification remains …

Ground-state phase diagram of quantum link electrodynamics in $(2+1)$-d

The exploration of phase diagrams of strongly interacting gauge theories coupled to matter in lower dimensions promises the …

Stabilizing lattice gauge theories through simplified local pseudo generators

The postulate of gauge invariance in nature does not lend itself directly to implementations of lattice gauge theories in modern setups …

From non-Hermitian linear response to dynamical correlations and fluctuation–dissipation relations in quantum many-body systems

Quantum many-body systems are characterized by their correlations. While equal-time correlators and unequal-time commutators between …

Thermalization dynamics of a gauge theory on a quantum simulator

Gauge theories form the foundation of modern physics, with applications ranging from elementary particle physics and early-universe …

Enhancing disorder-free localization through dynamically emergent local symmetries

Disorder-free localization is a recently discovered phenomenon of nonergodicity that can emerge in quantum many-body systems hosting …

Projective symmetry group classification of chiral $\mathbb{Z}_2$ spin liquids on the pyrochlore lattice: application to the spin-$1/2$ XXZ Heisenberg model

We give a complete classification of fully symmetric as well as chiral $\mathbb{Z}_2$ quantum spin liquids on the pyrochlore lattice …

Gauge protection in non-Abelian lattice gauge theories

Protection of gauge invariance in experimental realizations of lattice gauge theories based on energy-penalty schemes has recently …

2021

Gauge-Symmetry Protection Using Single-Body Terms

Quantum-simulator hardware promises new insights into problems from particle and nuclear physics. A major challenge is to reproduce …

Unconventional critical exponents at dynamical quantum phase transitions in a random Ising chain

Dynamical quantum phase transitions (DQPTs) feature singular temporal behavior in transient quantum states during nonequilibrium …

Dynamical phase transitions in quantum spin models with antiferromagnetic long-range interactions

In recent years, dynamical phase transitions and out-of-equilibrium criticality have been at the forefront of ultracold gases and …

Exciting the Goldstone Modes of a Supersolid Spin–Orbit-Coupled Bose Gas

Supersolidity is deeply connected with the emergence of Goldstone modes, reflecting the spontaneous breaking of both phase and …

From entanglement certification with quench dynamics to multipartite entanglement of interacting fermions

Multipartite entanglement, such as witnessed through the quantum Fisher information (QFI), is a crucial resource for quantum …

Polymer Physics by Quantum Computing

Sampling equilibrium ensembles of dense polymer mixtures is a paradigmatically hard problem in computational physics, even in …

Local measures of dynamical quantum phase transitions

In recent years, dynamical quantum phase transitions (DQPTs) have emerged as a useful theoretical concept to characterize …

Analog cosmological reheating in an ultracold Bose gas

Cosmological reheating describes the transition of the post-inflationary universe to a hot and thermal state. In order to shed light on …

Quantum aging and dynamical universality in the long-range $O(N\to\infty)$ model

Quantum quenches to or near criticality give rise to the phenomenon of aging, manifested by glassy-like dynamics at short times and far …

Dominant Reaction Pathways by Quantum Computing

Characterizing thermally activated transitions in high-dimensional rugged energy surfaces is a very challenging task for classical …

2020

Observation of gauge invariance in a 71-site quantum simulator

The modern description of elementary particles is built on gauge theories. Such theories implement fundamental laws of physics by local …

Robustness of gauge-invariant dynamics against defects in ultracold-atom gauge theories

Recent years have seen strong progress in quantum simulation of gauge-theory dynamics using ultracold-atom experiments. A principal …

Reliability of lattice gauge theories

Currently, there are intense experimental efforts to realize lattice gauge theories in quantum simulators. Except for specific models, …

Hybrid infinite time-evolving block decimation algorithm for long-range multi-dimensional quantum many-body systems

In recent years, the infinite time-evolution block decimation (iTEBD) method has been demonstrated to be one of the most efficient and …

Out-of-equilibrium phase diagram of long-range superconductors

Within the ultimate goal of classifying universality in quantum many-body dynamics, understanding the relation between …

Perspectives of quantum annealing: Methods and implementations

Quantum annealing is a computing paradigm that has the ambitious goal of efficiently solving large-scale combinatorial optimization …

A scalable realization of local U(1) gauge invariance in cold atomic mixtures

In the fundamental laws of physics, gauge fields mediate the interaction between charged particles. An example is quantum …

2019

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 …

2018

Relating Out-of-Time-Order Correlations to Entanglement via Multiple-Quantum Coherences

Out-of-time-order correlations (OTOCs) characterize the scrambling, or delocalization, of quantum information over all the degrees of …

2016

Real-time dynamics of lattice gauge theories with a few-qubit quantum computer

Gauge theories are fundamental to our understanding of interactions between the elementary constituents of matter as mediated …

Many-body localization in a quantum simulator with programmable random disorder

When a system thermalizes it loses all memory of its initialconditions. Even within a closed quantum system, subsystemsusually …

Measuring multipartite entanglement through dynamic susceptibilities

Entanglement is considered an essential resource in quantum technologies, and central to the understanding of quantum many-body …

2015

A quantum annealing architecture with all-to-all connectivity from local interactions

Quantum annealers are physical devices that aim at solving NP-complete optimization problems by exploiting quantum mechanics. The basic …

Spectroscopy of Interacting Quasiparticles in Trapped Ions

The static and dynamic properties of many-body quantum systems are often well described by collective excitations, known as …

Probing entanglement in adiabatic quantum optimization with trapped ions

Adiabatic quantum optimization has been proposed as a route to solve NP-complete problems, with a possible quantum speedup compared to …

2014

Tomography of Band Insulators from Quench Dynamics

We propose a simple scheme for tomography of band-insulating states in one- and two-dimensional optical lattices with two sublattice …

Quasiparticle engineering and entanglement propagation in a quantum many-body system

The key to explaining and controlling a range of quantum phenom-ena is to study how information propagates around many-body sys-tems. …

2012

Can one trust quantum simulators?

Various fundamental phenomena of strongly correlated quantum systems such as high-$T_c$ superconductivity, the fractional quantum-Hall …