Bonn 2025 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 37: Poster – Quantum Information Technologies (joint session Q/QI)
QI 37.24: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Towards fully chip-integrated optical and near-field microwave control of trapped-ion qubits — •Mohammad Masum Billah1,2, Florian Ungerechts1, Rodrigo Munoz1, Janina Bätge1, Axel Hoffmann1,4, Giorgio Zarantonello1,3, Christopher Reiche1,2, and Christian Ospelkaus1,2,5 — 1Institut für Quantenoptik, Leibniz Universität Hannover — 2Laboratorium für Nano- und Quantenengineering, Leibniz Universität Hannover — 3QUDORA Technologies GmbH — 4Institut für Hochfrequenztechnik und Funksysteme, Leibniz Universität Hannover — 5Physikalisch-Technische Bundesanstalt
To fully harness the capabilities of surface-electrode trapped ion quantum computers, a large number of qubits is essential. Scalable ion traps are critical for accommodating these qubits, but also require a significant number of free-space lasers for qubit state preparation as well as for readout, cooling and optical quantum gates. While microwave near-field gate operations can reduce the need for the latter lasers, achieving full scalability necessitates the integration of optical waveguides and grating couplers within the trap chip for effective qubit control. This integration poses novel challenges in ion trap design and the microfabrication processes used to create the corresponding chips. Our study addresses key issues such as the impact of optical windows in the chip on trapping potentials, DC shuttling operations, and specifically, the effects on microwave near-field interactions. We further explore the implications of these integrations and discuss the increasing complexity in fabricating such highly integrated ion traps.
Keywords: quantum information processing; optical waveguides; grating couplers; ion traps; microfabrication