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QI: Fachverband Quanteninformation
QI 28: Spin Qubits
QI 28.1: Hauptvortrag
Donnerstag, 9. März 2023, 11:00–11:30, F428
Conveyor-mode single-electron shuttling in Si/SiGe for a scalable quantum computing architecture — •Inga Seidler1, Tom Struck1, Ran Xue1, Stefan Trellenkamp2, Hendrik Bluhm1, and Lars R. Schreiber1 — 1JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Aachen, Germany — 2Helmholtz Nano Facility (HNF), Forschungszentrum Jülich, Jülich, Germany
Small spin-qubit registers defined by single electrons confined in Si/SiGe quantum dots operate successfully and connecting these could permit scalable quantum computation. Shuttling the electron qubit between registers is a natural choice for high-fidelity coherent links. We demonstrate proof-of-principle of shuttling of a single electron by a gate induced propagating wave-potential in Si/SiGe. Independent from its length only four sinusoidal control signals and low tuning effort are required. We transfer a single electron over a distance of 420 nm and observe a high single-electron shuttling fidelity of 99.42+-0.02 % including a reversal of direction [1]. Theoretical considerations of dephasing mechanisms promise coherent transport over 10 um [2]. Measuring the sensor response while transferring the electron enables us to detect the electron motion. Our shuttle can be readily embedded in industrial fabrication of Si/SiGe qubit chips and paves the way to solving the signal-fanout problem for a fully scalable semiconductor quantum-computing architecture.
[1] I.Seidler et al., npj Quant. Inf. 8, 100 (2022). [2] V. Langrock et al., arXiv:2202.11793.