Programmable Assembly of Ground State Fermionic Tweezer Arrays

Quantum simulation with ultracold fermions provides unique insights into the microscopic details of strongly interacting many-body systems. While optical lattice platforms have enabled remarkable progress, the choice of initial atomic configurations is typically limited to a set of accessible states such as Mott-insulators or charge density waves. Arrays of optical tweezers offer a powerful extension to this paradigm by allowing parallelized preparation and assembly of quantum systems atom-by-atom.

 

In this talk, I will present a new experimental approach for the deterministic preparation of arbitrary two-component product states of fermions in 2D optical tweezer arrays. By combining high-fidelity singlet preparation, parallel local spin selectivity, and single-shot spin-resolved imaging on microsecond timescales, we achieve low-entropy fermionic initialization with rapid experimental cycles. We demonstrate the capability of engineering target states, including classical antiferromagnetic patterns with precise defects, across arrays of up to 128 atoms. I will discuss ongoing work on interfacing these assembled states with a quantum gas microscope and outline the new future directions that these advancements open up for studying non-equilibrium dynamics, quantum magnetism, and fermionic quantum information processing.