A ytterbium-171 array in an optical cavity.*

Alkaline-earth(-like) atom arrays are an emerging platform for quantum information science (QIS), and in particular the 171Yb atomic species has shown to be a great candidate for QIS applications for its nuclear spin-1/2 structure as well as various optical transitions attractive for qubit readout (556 nm), clock, telecom (1389 nm), and single-photon Rydberg excitation.

Integrating an 171Yb array in an optical cavity then offers exciting prospects in enhancing readout (for quantum networking and generic feedback-enhanced circuits) as well as utilizing long range interaction for simulation and metrology.

We will present our progress toward 171Yb atom array coupling to our dual-wavelength (556 nm/1389 nm) Fabry-Perot cavity in the near concentric regime.  We report a finesse of 30k with cavity stability ∣𝑔_cav| > 0.9, correspond to a single-atom cooperativity 𝐶 > 5.7 at 556 nm. We further present out progress towards an atom array, with cavity-chamber integration and a 3DMOT inside the cavity. We predict a high qubit readout fidelity within tens of microseconds for fast quantum non-demolition (QND) readout , and a collection efficiency of ~50% for telecom photons.