Photonic integrated circuits (PICs) play a pivotal role in scaling trapped ion quantum systems. However, current quantum PICs suffer from low ion densities. We present a novel quantum PIC for individual optical control of closely-spaced trapped ion qubits. Our device achieves effectively achromatic beam focusing from 405 nm to 810 nm (and beyond) via a planar waveguide lens and a 3D-printed biconic mirror. Moreover, we have measured 30 dB crosstalk at a 5 µm pitch for the 532 nm and 729 nm barium and calcium gate wavelengths, surpassing the state-of-the-art. Finally, our monolithic surface trap integration aims to mitigate the detrimental effects of photoinduced dielectric charging, presenting a potential leap forward in ion trap technology.
Project currently funded by: Federal