Programmable Quantum Walks with tweezer-trapped Atoms

Neutral atoms in optical tweezer arrays have become a powerful and flexible platform for quantum simulation of the Hubbard model. In this talk, we demonstrate quantum random walks of a single strontium atom in 1D tweezer arrays. We enhance coherent tunneling between sites by introducing an additional modulated tweezer trap between the original lattice sites. This hybrid tweezer system enables dynamic temporal and spatial control of tunneling, enabling programmable quantum walks. These results highlight the potential of optical tweezer arrays for studying Hubbard models in finite-size lattices with arbitrary geometries and controlled disorder.