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QI: Fachverband Quanteninformation
QI 3: Semiconductor Spin Qubits I: Silicon
QI 3.1: Hauptvortrag
Montag, 10. März 2025, 11:00–11:30, HS II
Conveyor-mode shuttling of electron spin qubits in Si/SiGe for scalable architectures — Tom Struck1, Mats Volmer1, Max Beer1, Ran Xue1, Alex Willmes1, Max Oberländer1, Till Huckemann1, Arnau Sala1, Łukasz Cywiński2, Hendrik Bluhm1,3, and •Lars R. Schreiber1,3 — 1JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Germany — 2Institute of Physics, Polish Academy of Sciences, Warsaw, Poland — 3ARQUE Systems GmbH, Germany
Long-range coherent qubit coupling is a missing functional block for a scalable architecture of a spin-qubit based quantum computer. In a conveyor-mode shuttle, the spin-qubit is adiabatically transported while confined to a propagating sinusoidal potential in a gate-defined quantum channel [1]. Its key feature is the all-electrical operation by only few easily tunable input terminals. I present progress on conveyor-mode single electron shuttling in Si/SiGe. In a 10 micron long shuttle device, we experimentally demonstrate a shuttle fidelity of 99.7 % across the full device and back and a shuttle-based charge initialization of 34 quantum dots [2]. We observe spin coherent shuttling by separation and rejoining of a spin EPR pair [3] and map electrostatic disorder and the valley splitting [4]. Recent progress on silicon foundry fabrication and in shuttling through T-junctions could enable two-dimensional sparse qubit-architecture hosting millions of spin-qubits.
[1] Langrock ea. PRX Quantum 4, 020305 (2023). [2] Xue ea. Nat. Commun. 15, 2296 (2024). [3] Struck ea. Nat. Commun. 15, 1325 (2024). [4] Volmer ea. npj Quantum Inf. 10, 61 (2024).
Keywords: electron spin qubits; silicon germanium; conveyor-mode shuttling; scalable architecture; valley splitting