SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 37: Materials and devices for quantum technology II
HL 37.1: Vortrag
Donnerstag, 30. März 2023, 09:30–09:45, JAN 0027
Long-range shuttling of single electron by Si/SiGe conveyor — •Ran Xue1, Max Beer1, Jhih-Sian Tu2, Simon Humpohl1, Inga Seidler1, Tom Struck1, Tobias Hangleiter1, 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
Electrostatically confined electrons are promising candidates for spin-qubits due to their long coherence in 28Si/SiGe. To scale up qubit numbers and integrate control electronics, we propose to use a 10 µm long quantum bus (QuBus), which requires four control lines independent of the shuttle distance. Providing a propagating sinusoidal potential in a gate-defined 1D channel, adiabatic movement of a quantum dot filled by a single electron representing the qubit has achieved a shuttling fidelity of 99.4±0.02% in a 420 nm long QuBus [1]. Here, we propose and demonstrate the tomography of a single electron shuttling process on a scaled-up 10 µm long QuBus. The electron is shuttled forth and back over micrometer-scale by a time-reversible pulse composed by only four sine-waves. Our tomography measures the shuttling fidelity and detects shuttling failures such as electron tunneling across pockets of the sinusoidal shuttling potential due to local potential disorder [2].
[1] Seidler, I. et al., npj Quantum Inf. 8: 100 (2022).
[2] Langrock, V. et al., arXiv: 2202.11793 (2022).
Work funded by the DFG under project number EXC 2004/1-390534769.