Mainz 2026 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

Q: Fachverband Quantenoptik und Photonik

Q 12: Quantum Computing and Simulation II

Q 12.1: Invited Talk

Monday, March 2, 2026, 17:00–17:30, P 10

Topological pumping and quantum information — •Konrad Viebahn, Yann Kiefer, Zijie Zhu, Lars Fischer, Marius Gächter, Giacomo Bisson, Samuel Jele, Lisa Peters, and Tilman Esslinger — Institute for Quantum Electronics, ETH Zurich, Switzerland

Topological pumps provide a powerful method for transporting particles with remarkable precision by slowly and cyclically modulating a lattice potential. This transport is topologically protected - a feature it shares with the quantum Hall effect - making it inherently robust against noise and experimental imperfections.

In this talk, I will introduce a novel paradigm of this concept: moving beyond the transport of individual particles to the pumping of qubits carrying quantum information. Our experiments, which employ ultracold fermions in dynamical optical lattices [1,2], demonstrate the coherent transport of not only single atoms but also entangled Bell pairs over hundreds of lattice sites. This capability allows us to perform fundamental quantum computations during transport, including high-fidelity two-qubit gates. I will show how we can chain these operations together to build non-local quantum circuits and generate complex entanglement patterns across the lattice.

[1] Zhu et al. PRX (2025), Splitting and connecting singlets in atomic quantum circuits

[2] Kiefer et al. arXiv:2507.22112, Protected quantum gates using qubit doublons in dynamical optical lattices

Keywords: Ultracold fermions; Optical lattices; Collisional gates; Topological transport; Quantum gases