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 on the rightfollow the links in the navigation bar to each individual lab.


Recent Publications

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Analyzing non-equilibrium quantum states through snapshots with artificial neural networks
10/2021
Phys. Rev. Lett. 127, 150504 (2021) arXiv:2012.11586
Annabelle Bohrdt, S. Kim, A. Lukin, M. N. Rispoli, R. Schittko, Michael Knap, M. Greiner, J. Léonard
Current quantum simulation experiments are starting to explore non-equilibrium many-body dynamics in previously inaccessible regimes in terms of system sizes and time scales. Therefore, the question emerges which observables are best suited to study the dynamics in such quantum many-body systems. Using machine learning techniques, we investigate the dynamics and in particular the thermalization behavior of an interacting quantum system which undergoes a dynamical phase transition from an ergodic to a many-body localized phase. A neural network is trained to distinguish non-equilibrium from thermal equilibrium data, and the network performance serves as a probe for the thermalization behavior of the system. We test our methods with experimental snapshots of ultracold atoms taken with a quantum gas microscope. Our results provide a path to analyze highly-entangled large-scale quantum states for system sizes where numerical calculations of conventional observables become challenging.

News

Robin and Julian leave Greiner lab
11/2021
We say farewell to Julian and Robin. Robin is moving on to a Ph.D. in the group of Immanuel Bloch, while Julian is starting a professorship at TU Wien (where he is looking to hire new lab members). We wish them both the best!
Ogi joins Greiner lab
10/2021
Postdoc Ognjen Marković has joined the Erbium lab. Welcome, Ogi!
Rob Defends
10/2021
Congratulations to Rob for successfully defending his thesis!
Alec joins Greiner lab
09/2021
PhD student Alec Douglas has joined the Erbium lab. Welcome, Alec!