A5069555561- Cold Atom Physics and Bose-Einstein Condensates
- Quantum many-body systems
- Quantum, superfluid, helium dynamics
- Inorganic Chemistry and Materials
- Iron-based superconductors research
- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Advanced Thermodynamics and Statistical Mechanics
- Iron oxide chemistry and applications
- Quantum Information and Cryptography
- Advanced Chemical Physics Studies
- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Nanocluster Synthesis and Applications
- Quantum and electron transport phenomena
- Advanced NMR Techniques and Applications
- Inorganic Fluorides and Related Compounds
- Machine Learning in Materials Science
- Topological Materials and Phenomena
- Amyloidosis: Diagnosis, Treatment, Outcomes
- Expert finding and Q&A systems
- Quantum optics and atomic interactions
- Metalloenzymes and iron-sulfur proteins
- Characterization and Applications of Magnetic Nanoparticles
Vienna Center for Quantum Science and Technology
2023-2024
TU Wien
2023-2024
Harvard University Press
2019-2023
Harvard University
2019-2023
ETH Zurich
2014-2018
École Normale Supérieure - PSL
2012
Centre National de la Recherche Scientifique
2012
Massachusetts Institute of Technology
2012
Institute for Atomic and Molecular Physics
2004-2005
University of Amsterdam
2004
An interacting quantum system that is subject to disorder may cease thermalize due localization of its constituents, thereby marking the breakdown thermodynamics. The key our understanding this phenomenon lies in system's entanglement, which experimentally challenging measure. We realize such a many-body-localized disordered Bose-Hubbard chain and characterize entanglement properties through particle fluctuations correlations. observe particles become localized, suppressing transport...
Higgs and Goldstone modes are collective excitations of the amplitude phase an order parameter that is related to breaking a continuous symmetry. We directly studied these in supersolid quantum gas created by coupling Bose-Einstein condensate two optical cavities, whose field amplitudes form real imaginary parts U(1)-symmetric parameter. Monitoring cavity fields time allowed us observe dynamics associated revealed their nature. used spectroscopic method measure frequencies, we gave tunable...
Realizing strongly correlated topological phases of ultracold gases is a central goal for ongoing experiments. While fractional quantum Hall states could soon be implemented in small atomic ensembles, detecting their signatures few-particle settings remains fundamental challenge. In this work, we numerically analyze the center-of-mass drift ensemble hardcore bosons, initially prepared ground state Harper-Hofstadter-Hubbard model box potential. By monitoring upon release, wide range magnetic...
Large-scale quantum devices provide insights beyond the reach of classical simulations. However, for a reliable and verifiable simulation, building blocks device require exquisite benchmarking. This benchmarking large-scale dynamical systems represents major challenge due to lack efficient tools their simulation. Here, we present scalable algorithm based on neural networks Hamiltonian tomography in out-of-equilibrium systems. We illustrate our approach using model forefront simulation...
We demonstrate an interference method to determine the low-energy elastic scattering amplitudes of a quantum gas. linearly accelerate two ultracold atomic clouds up energies 1.2 mK and observe collision halo by direct imaging in free space. From between $s$- $d$- partial waves differential pattern we extract corresponding phase shifts. The does not require knowledge density. This allows us infer accurate values for $d$-wave from zero-energy limit first Ramsauer minimum using only van der...
Current quantum simulation experiments are starting to explore nonequilibrium many-body dynamics in previously inaccessible regimes terms of system sizes and timescales. Therefore, the question emerges as which observables best suited study such systems. Using machine learning techniques, we investigate and, particular, thermalization behavior an interacting that undergoes a phase transition from ergodic localized phase. We employ supervised unsupervised training methods distinguish...
Topological states of matter, such as fractional quantum Hall states, are an active field research due to their exotic excitations. In particular, ultracold atoms in optical lattices provide a highly controllable and adaptable platform study new types matter. However, finding clear route realize non-Abelian these systems remains challenging. Here we use the density-matrix renormalization-group (DMRG) method Hofstadter-Bose-Hubbard model at filling factor $\ensuremath{\nu}=1$ find strong...
We present an optical setup with focus-tunable lenses to dynamically control the waist and focus position of a laser beam, in which we transport trapped ultracold cloud 87Rb over distance . The scheme allows us shift at constant waist, providing uniform trapping conditions full length. fraction atoms that are transported entire comes near unity, while heating is range few microkelvin. characterize stability show residual drift rates can be compensated for by counteracting tunable lenses....
Strongly correlated systems can exhibit surprising phenomena when brought in a state far from equilibrium. A spectacular example are quantum avalanches, that have been predicted to run through many-body--localized system and delocalize it. Quantum avalanches occur the is locally coupled small thermal inclusion acts as bath. Here we realize an interface between of variable size, study its dynamics. We find evidence for accelerated transport into localized region, signature avalanche. By...
New generations of ultracold-atom experiments are continually raising the demand for efficient solutions to optimal control problems. Here, we apply Bayesian optimization improve a state-preparation protocol recently implemented in an system realize two-particle fractional quantum Hall state. Compared manual ramp design, demonstrate superior performance our approach numerical simulation – resulting that is 10x faster at same fidelity, even when taking into account experimentally realistic...
We report on adiabatic state preparation in the one-dimensional quantum Ising model using ultracold bosons a tilted optical lattice. prepare many-body ground states of controllable system sizes and observe enhanced fluctuations around transition between paramagnetic antiferromagnetic states, marking precursor critical behavior. Furthermore, we find evidence for superpositions domain walls study their effect by measuring populations each spin configuration across transition. These results...
Strongly interacting topological matter exhibits fundamentally new phenomena with potential applications in quantum information technology. Emblematic instances are fractional Hall states, where the interplay of magnetic fields and strong interactions gives rise to fractionally charged quasi-particles, long-ranged entanglement, anyonic exchange statistics. Progress engineering synthetic has raised hope create these exotic states controlled systems. However, except for a recent Laughlin state...