Optical superlattice for engineering Hubbard couplings in quantum simulation
arxiv(2024)
摘要
Quantum simulations of Hubbard models with ultracold atoms rely on the
exceptional control of coherent motion provided by optical lattices. Here we
demonstrate enhanced tunability using an optical superlattice in a fermionic
quantum gas microscope. With our phase-stable bichromatic design, we achieve a
precise control of tunneling and tilt throughout the lattice, as evidenced by
long-lived coherent double-well oscillations and next-nearest-neighbor quantum
walks in a staggered configuration. We furthermore present correlated quantum
walks of two particles initiated through a resonant pair-breaking mechanism.
Finally, we engineer tunable spin couplings through local offsets and create a
spin ladder with ferromagnetic and antiferromagnetic couplings along the rungs
and legs, respectively. Our work underscores the high potential of optical
superlattices for engineering, simulating, and detecting strongly correlated
many-body quantum states.
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