Welcome to the Greiner Lab!
We use ultracold quantum gases on optical lattices to simulate models from condensed matter physics. Thanks to the microscopy technique developed here, we can see and manipulate individual atoms to perform experiments with remarkable levels of control and accuracy.
For the nonexperts, the 10-minute documentary introducing the background, motivation, and apparatus of our lab is a great starting point. To learn about the sciences, follow the links in the navigation bar to each individual lab.
Recent Publications
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A Pfaffian quantum Hall state of ultracold bosons
Fractional quantum Hall states are a cornerstone of topological physics, hosting fractionally charged quasiparticles with exotic statistics that promise to enable topologically protected quantum information processing. Among these, the Pfaffian state introduced by Moore and Read implements a p-wave pairing structure that supports excitations with non-Abelian exchange statistics. Despite extensive study in electronic systems, direct access to its pairing structure has remained limited. Here we realize a three-particle bosonic Pfaffian state of ultracold 87Rb atoms in an optical lattice subject to a Floquet-engineered synthetic magnetic field. Using a Bayesian-optimized adiabatic protocol, we prepare a state exhibiting Pfaffian pairing correlations. Site-resolved measurements of multi-point density correlations reveal a pronounced suppression of short-range three-body coincidences, reflecting the underlying pairing structure. We further probe the state’s transport response through Hall drift measurements. Our results establish a bottom-up approach to engineering non-Abelian topological order and lay the groundwork for future explorations of anyonic braiding in synthetic matter.
News
Sandra joins Greiner lab
Temperature breakthrough by Lithium team!
Recent work in Nature from the lithium lab, reaches unprecedentedly low temperatures in the Hubbard model, bringing quantum simulations into a regime where they can be truly useful for addressing open questions in material science and condensed matter physics, and where classical simulations are at their limit.