Development and Integration of Silicon Photonics Interposer for Quantum Computing System

In this work, we report the design and optimization of photonics interposer for addressing trapped ion in a quantum computing system. The interposer is built on commercial SOI platform comprising of grating couplers and waveguide. 1,092 nm light beam can be coupled into the input coupler and propagates along the waveguide, which is eventually directed towards the trapped 88Sr+ ion qubit. Considering the coupling efficiency of both input and output coupler, the power efficiency reaching the trapped ion can be estimated to be ∼ 16%, and the output 1,092 nm light can be coupled onto the trapped ion qubit for addressing.