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The development of scalable, high-fidelity qubits is a key challenge inquantum information science. Neutral atom qubits have progressed rapidly inrecent years, demonstrating programmable processors and quantum simulators withscaling to hundreds of atoms. Exploring new atomic species, such as alkalineearth atoms, or combining multiple species can provide new paths to improvingcoherence, control and scalability. For example, for eventual application inquantum error correction, it is advantageous to realize qubits with structurederror models, such as biased Pauli errors or conversion of errors intodetectable erasures. In this work, we demonstrate a new neutral atom qubit,using the nuclear spin of a long-lived metastable state in ${}^{171}$Yb. Thelong coherence time and fast excitation to the Rydberg state allow one- andtwo-qubit gates with fidelities of 0.9990(1) and 0.980(1), respectively.Importantly, a significant fraction of all gate errors result in decays out ofthe qubit subspace, to the ground state. By performing fast, mid-circuitdetection of these errors, we convert them into erasure errors; duringdetection, the induced error probability on qubits remaining in thecomputational space is less than $10^{-5}$. This work establishes metastable${}^{171}$Yb as a promising platform for realizing fault-tolerant quantumcomputing.

High-fidelity gates with mid-circuit erasure conversion in a metastable neutral atom qubit