We implement mid-circuit operations in a 48-site array of neutral atoms,
enabled by new methods for control of the omg
(optical-metastable-ground state qubit) architecture present in 171Yb.
We demonstrate laser-based control of ground, metastable and optical qubits
with average single-qubit fidelities of Fg=99.968(3), Fm=99.12(4)
and Fo=99.804(8). With state-sensitive shelving between the ground and
metastable states, we realize a non-destructive state-detection for 171Yb,
and reinitialize in the ground state with either global control or local
feed-forward operations. We use local addressing of the optical clock
transition to perform mid-circuit operations, including measurement, spin
reset, and motional reset in the form of ground-state cooling. In
characterizing mid-circuit measurement on ground-state qubits, we observe raw
errors of 1.8(6)% on ancilla qubits and 4.5(1.0)% on data qubits, with
the former (latter) uncorrected for 1.0(2)% (2.0(2)%) preparation and
measurement error; we observe similar performance for mid-circuit reset
operations. The reported realization of the omg architecture and
mid-circuit operations are door-opening for many tasks in quantum information
science, including quantum error-correction, entanglement generation, and
metrology