Integrated multi-wavelength photonic routing architectures for scalable trapped ion quantum devices

Recent advances in quantum technologies rely on precise control and integration of quantum objects, and technological breakthroughs are anticipated for further scaling up to realize practical applications. Trapped-ion quantum technology is a promising candidate to realize them, while its scalability depends on the development of intra-node scaling up, reproducibility of quantum nodes, and photonic interconnection among them. Utilization of integrated photonics instead of free-space optics is a crucial step toward mass production of trapped-ion quantum nodes and manifests itself as useful for laser delivery for various quantum operations and photon detection. However, the whole architecture of the scalable photonic circuits for them is left unexplored. In this work, we discuss photonic routing architectures for trapped-ion quantum devices, in which lasers of multiple wavelengths are delivered to multiple trapping zones within a single chip. We analyze two methods of configuring nanophotonic waveguides and compare them in terms of loss of total laser power. This work opens up a new landscape of photonic architecture for trapped-ion quantum technologies, which broadens the scope of integrated photonics for quantum technologies.