Characterization of A Novel 2D-3D Photonic Integrated Circuit for Broadband, High-Efficiency Control of Trapped Ion Qubits

Photonics integration offers a promising path toward scalable quantum processors. We implement a monolithic surface trap with a novel integrated photonic circuit layer that achieves broadband beam focusing over a wavelength range from 405 nm to 900 nm, using a planar waveguide lens paired with a 3D-printed biconic mirror. Additionally, our device exhibits 30-dB crosstalk suppression at the 40Ca+ optical gate wavelength of 729 nm, assuming a 5 um ion-ion distance. Experimentally, we characterize the trap by trapping 40Ca+ ions and conducting preliminary measurements of motional heating rates and charging effects. Furthermore, we demonstrate laser delivery of 866 nm, 854 nm, and 729 nm light to the ions via a single 3D-printed biconic mirror.