Characterization of site-resolved coherent control on an array of nuclear spin qubits

Neutral atoms trapped in optical tweezers are a promising platform for implementing scalable quantum computers. Here we introduce a system with the ability to individually manipulate a two-dimensional array of nuclear spin qubits. Each qubit is encoded in the ground state manifold of ⁸⁷Sr and is individually addressable by site-selective beams. We observe negligible spin relaxation after 5 seconds, indicating that T₁ ≫ 5 s. We also demonstrate significant phase coherence over the entire array, measuring T^*₂ = (21 ± 7) s and T_echo = (42 ± 6) s with a single echo pulse. Utilizing gate set tomography (GST), we obtain single qubit gate fidelities greater than 99.0%. Capitalizing on these beneficial properties of our optical tweezer platform, we aim to scale this system to a larger array of qubits in a parallelizable manner.