Yb nuclear-spin qubits*

Recent progress with optical tweezer arrays has shown that Ytterbium-171 has several favorable features for quantum computing and entanglement generation. The naturally two-level nuclear spin qubit is highly robust in both the ground electronic state (¹S₀) and metastable clock state (³P₀), due to a lack of hyperfine coupling in J=0 states. We have demonstrated fast high-fidelity manipulation of nuclear spin qubits with T₂* coherence times of several seconds, high-fidelity cooling, and imaging [1]. Recently, we also have demonstrated mid-circuit measurement using the neutral-atom version of the omg (optical-metastable-ground) architecture, where we store ancilla atoms in the optical clock state which is dark to the measurement beam. [2]. In this talk, we describe our progress in generating and manipulating entangled Ytterbium atom arrays. We initialize radial motional ground state atoms in the meta-stable clock state, utilizing coherent excitation of the clock transition. Then, we demonstrate high-fidelity manipulation of the Rydberg state with T₂* coherence time up to >10 μs. We report the result of a fast, high-fidelity two-qubit gate using purely optical fields,  and our progress towards quantum circuits featuring mid-circuit measurement and feedback.