The Trapped-Ion Quantum Engineering group at Leibniz University of Hannover (LUH) and thePhysikalisch-Technische Bundesanstalt (PTB) studies the physics of trapped ions inradiofrequency and Penning traps. We provide an overview of the group and report on recentexperimental results. We focus on our efforts to combine chip-integrated near-field microwaveconductors for laser-free quantum logic gates and the Quantum Charge-Coupled Device (QCCD)architecture. This register-based architecture provides a scalable platform for trapped-ion quantumprocessors, enabling all-to-all connectivity between the atomic ion qubits. In the past, allfundamental building blocks of the architecture have been demonstrated successfully. However,combining those techniques into scalable devices is a current research topic. We present ourrecently developed surface-electrode traps for near-term quantum information processing with upto 50 atomic ion qubits, highlighting the design and simulation of radiofrequency (RF) junctions,bucket-brigade storage registers, and chip-integrated microwave conductors.

We acknowledge funding by the Quantum Valley Lower Saxony (QVLS) Q-1 project, the FederalMinistry of Education and Research of Germany (BMBF) through the MIQRO and ATIQ projects,and the European Union via the MILLENION project (HORIZON-CL4-2022-QUANTUM-01-SGA).