Physikalisches Kolloquium: Johannes Zeiher – Understanding, controlling and creating many-body systems atom by atom

Titel: Understanding, controlling and creating many-body systems atom by atom

Abstract:
Microscopic control and readout of individual quanta has been one of the driving forces behind advances in quantum science and technology in recent years, leading to spectacular breakthroughs across quantum simulation, quantum computing, quantum optics, and quantum metrology. In my talk, I will present recent results on quantum-gas microscopy of many-body systems both in and out of equilibrium. In particular, I will discuss an experiment demonstrating strongly constrained out-of-equilibrium transport and the emergence of Hilbert space fragmentation in two-dimensional tilted Hubbard systems. In the second part of my talk, I will introduce a hybrid experimental platform based on the alkaline-earth atom strontium. By directly loading thousands of individually addressable atoms from a magneto-optical trap into an optical lattice, we achieve high-fidelity, low-loss imaging and iterative assembly of atom arrays. For applications in quantum computing and simulation, we encode a qubit in the metastable fine-structure states of strontium, demonstrating long coherence times, high-fidelity control, and fast initialization via coherent three-photon coupling from the ground state. I will conclude by outlining our ongoing work on a new experimental platform that integrates an optical resonator with tweezer-trapped atoms, enabling novel light–matter interfaces for quantum simulators and quantum computers.

Sprecher / Speaker: Prof. Johannes Zeiher( LMU München & Max Planck Institut für Quantenoptik)
Kontakt / Contact: Prof. Dr. Michael Hartmann