SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 37: Materials and devices for quantum technology II

HL 37.4: Talk

Thursday, March 30, 2023, 10:15–10:30, JAN 0027

Coherent Conveyor Mode Shuttling of Electrons and their Spin — •Tobias Offermann, Tom Struck, Lino Visser, Mats Volmer, Ran Xue, Hendrik Bluhm, and Lars R. Schreiber — JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, Aachen, Germany

A missing key technology for scaling up electron spin qubits in ²⁸Si/SiGe is a coherent medium-range coupling between two qubits. It would enable a sparse-qubit architecture and makes space for signal-line fan-out and cryogenic electronics tiles integrated on the qubit chip. We present an approach named conveyor-mode shuttling, which relies on physically transporting the electron by a propagating wave-potential with simple input signals across an electrostatically defined quantum-channel [1,2]. We will introduce high fidelity single electron shuttling at a velocity high enough to reduce the shuttling time well below the typical spin-dephasing time of natural silicon. We show initialisation of the shuttle device on one end by two electrons in a spin-singlet. Shuttling only one of these electrons, we generate a separated Einstein-Podolsky-Rosen spin-pair. Combining the electrons by shuttling again, we detect their spin-singlet fraction by Pauli-spin blockade and explore the spin-coherence of the shuttling process.
[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.