Coherent spin qubit shuttling through germanium quantum dots

Floor Riggelen-Doelman, Chien-An Wang, Sander L. Snoo, William I. L. Lawrie, Nico W. Hendrickx, Maximilian Rimbach-Russ, Amir Sammak, Giordano Scappucci, Corentin Déprez () and Menno Veldhorst ()
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Floor Riggelen-Doelman: Delft University of Technology
Chien-An Wang: Delft University of Technology
Sander L. Snoo: Delft University of Technology
William I. L. Lawrie: Delft University of Technology
Nico W. Hendrickx: Delft University of Technology
Maximilian Rimbach-Russ: Delft University of Technology
Amir Sammak: QuTech and Netherlands Organisation for Applied Scientific Research (TNO)
Giordano Scappucci: Delft University of Technology
Corentin Déprez: Delft University of Technology
Menno Veldhorst: Delft University of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Quantum links can interconnect qubit registers and are therefore essential in networked quantum computing. Semiconductor quantum dot qubits have seen significant progress in the high-fidelity operation of small qubit registers but establishing a compelling quantum link remains a challenge. Here, we show that a spin qubit can be shuttled through multiple quantum dots while preserving its quantum information. Remarkably, we achieve these results using hole spin qubits in germanium, despite the presence of strong spin-orbit interaction. In a minimal quantum dot chain, we accomplish the shuttling of spin basis states over effective lengths beyond 300 microns and demonstrate the coherent shuttling of superposition states over effective lengths corresponding to 9 microns, which we can extend to 49 microns by incorporating dynamical decoupling. These findings indicate qubit shuttling as an effective approach to route qubits within registers and to establish quantum links between registers.

Date: 2024
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DOI: 10.1038/s41467-024-49358-y

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