High Fidelity Entangling Gates on a Hubbard Fermionic Quantum Computer

In our quantum gas microscope, we load fermionic ⁶Li atoms into optical superlattices and image the local density and spin by performing site-resolved projective measurements. I will present how the exceptional control of optical superlattices and local measurements enables us to realize building blocks for digital quantum computation and to perform analog quantum simulation [1, 2].

Our machine allows us to encode single-particle [3] or two-particle qubits in isolated double wells. Using interacting fermions with opposite spins in double wells, we realize two-qubit entangling gates with fidelities above 99% on up to 120 atoms in parallel. The estimated two-qubit gate infidelity is lower than the threshold needed for certain fault-tolerant models. This platform of fermionic qubits holds significant potential for quantum computation of electronic systems, such as the simulation of molecules.