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THU: Thursday Contributed Sessions

THU 7: Entanglement and Complexity: Contributed Session to Symposium II

THU 7.4: Vortrag

Donnerstag, 11. September 2025, 15:00–15:15, ZHG008

Splitting and interconnecting atomic singlets in dynamical superlattices — •Yann Kiefer, Zijie Zhu, Lars Fischer, Konrad Viebahn, and Tilman Esslinger — ETH Zürich, Zürich, Switzerland

The transport of atoms, electrons or entanglement in general in large many-body systems is becoming an increasingly important task for quantum applications. Often, long-distance qubit connectivity relies on the transport of particles, which leads to unwanted excitations and heating and ultimately the loss of information. To circumvent this, we present a ground-state preserving transportation scheme based on periodic modulation of an optical lattice potential.

In detail, we leverage topological pumping in a periodically modulated one-dimensional optical superlattice to realise the transport of coherent fermionic two-particle states over large distances. Furthermore, we use the access of the optical lattice potential to implement gate operations by engineering the local superexchange coupling J. More specifically, when two particles meet in a double well of the optical lattice, we can control J using two different methods, such that two-particle (SWAP)^n gates are implemented while preserving the motional many-body ground state of the system. We reveal the successful implementation of such gates by observing multi frequency singlet-triplet oscillations (STOs) as a direct signature of entanglement between fermions distributed over tens of lattice sites.

Keywords: Optical Superlattices; Quantum Computing; Entanglement engineering; Ultracold Fermions; Quantum Processing