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arXiv:2505.07445

Integrated Multi-Wavelength Photonic Architectures for Future Scalable Trapped Ion Quantum Devices

Alto Osada, Koichiro Miyanishi

Published May 12, 2025• 0 citations
arXivHTMLPDF

Abstract

Recent advances of quantum technologies rely on precise control and integration of quantum objects, and technological breakthrough is anticipated for further scaling up to realize practical applications. Trapped-ion quantum technology is a promising candidates 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, whole architecture of the scalable photonic circuits for them is left unexplored. In this work, we discuss photonic 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 various applications not only to quantum ones such as trapped-ion devices but also to classical photonics, e.g. optoelectronic devices and biochemical sensing.

DOI
10.48550/arxiv.2505.07445

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Trapped-ion quantum computers, leveraging a quantum charge-coupled device (QCCD) architecture, have world-class performance in the field of quantum computing, offering high fidelities and all-to-all connectivity [1]. While systems have advanced over the last decade, much work remains to scale quantum computers to fault-tolerance. Providing scalable light delivery is one key challenge. Current systems utilize engineered bulk- and fiber-optic-based light delivery systems, external to the vacuum chamber, to deliver arrays of beams to ions. However, fundamental optical limitations preclude the use of such systems when scaling beyond thousands of qubits. Integrated photonic-based beam delivery offers a potential solution, with encouraging proof-of-concept demonstrations from the photonics and quantum communities [2]–[5]. Quantinuum and Sandia National Labs have partnered to accelerate the development of integrated photonics for trapped-ion quantum computing applications, working towards photonic components supporting high-fidelity operations. Here, we present development of photonic integrated components designed to deliver laser light toBa+\text{Ba}^{+}Ba+qubits, utilizing a low-loss, high-confinement, trap-integrable PECVD SiN platform. In order to demonstrate two-qubit gates at 532 nm, we developed low loss, tight bend waveguides, efficient edge couplers, and asymmetric multimode interference (MMI) splitters, along with beam-forming grating out-couplers delivering gaussian beams at the ion plane. For quantum state preparation and measurement (SPAM) applications at4 9 3   n m\text{4 9 3 ~ n m}4 9 3   n m, we demonstrate fabrication-tolerant splitters and low-crosstalk gratings. Measured component performance shows promise for future trap-integrated demonstrations.