Abstract: Silicon is among the most advanced platform for scalable integrated photonics and a high-quality host material for solid-state spins. However, developing an efficient spin-photon interface within silicon is still an active area of research. In this talk, I will present an integrated photonics platform featuring color centers in silicon that operates in the telecom O-band. Specifically, we focus on T centers—a type of carbon-hydrogen defect—with long electron and nuclear spin coherence times. For an efficient photonic interface, we integrate T centers into photonic crystal cavities (PCCs). Using a novel architecture of PCC arrays coupled to a bus waveguide, we achieve wavelength-multiplexed emission from T centers in different cavities and probe signatures of cavity-cavity interactions mediated by the waveguide. Additionally, the same device allows us to investigate factors contributing to T center spectral diffusion. Regarding spin operations, I will discuss our progress in coherent microwave spin control and optical readout for waveguide-integrated individual T centers. These advances represent the first steps toward building a scalable quantum network based on silicon photonics.

Biography: Xueyue (Sherry) Zhang is a Miller Fellow at UC Berkeley and will join Columbia University as an Assistant Professor in January 2025. She earned her B.Eng. from Tsinghua University in 2017 and her Ph.D. in Applied Physics from Caltech in 2023. Dr. Zhang's research interests include superconducting circuits, quantum many-body simulations, and color centers in silicon. Her work has earned her several awards, including the Miller Research Fellowship, the Boeing Quantum Creator Prize, and the Rising Star in Physics Award in 2023.