A Platform for High-Fidelity Microwave and Optical Control of 85Rb Qubits

Within the TU/e Kat-1 team, we aim to realize an implementation of a full-stack hybrid quantum computer. At its core, our quantum processor is based on neutral rubidium-85 atoms confined in optical tweezers, with qubit states encoded in the hyperfine splitting of the ground state. Within this poster, we present our plans and initial results of an upgraded experimental setup aimed at achieving higher gate fidelities. Key improvements include the design of a new four-coil configuration for driving global microwave transitions with arbitrary polarization and increased homogeneity. In addition, we introduce an alignment-free, dual-wavelength local addressing system based on shared acousto-optical deflectors. This system suppresses beam-pointing instabilities between the addressing and trapping beams. Together, these developments are expected to enhance the robustness and fidelity of both our global and local qubit operations.