Coherent spin qubit shuttling through germanium quantum dots
Floor van Riggelen-Doelman (Kavli institute of nanoscience Delft, TU Delft - QCD/Veldhorst Lab, TU Delft - QuTech Advanced Research Centre)
Chien-An Wang (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Veldhorst Lab, Kavli institute of nanoscience Delft)
Sander L. de Snoo (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Vandersypen Lab, Kavli institute of nanoscience Delft)
William I.L. Lawrie (Kavli institute of nanoscience Delft, TU Delft - QCD/Veldhorst Lab, TU Delft - QuTech Advanced Research Centre)
Nico W. Hendrickx (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QCD/Veldhorst Lab)
Maximilian Rimbach-Russ (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Rimbach-Russ, Kavli institute of nanoscience Delft)
Amir Sammak (TU Delft - BUS/TNO STAFF, TU Delft - QuTech Advanced Research Centre)
Giordano Scappucci (TU Delft - QCD/Scappucci Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
Corentin Déprez (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QCD/Veldhorst Lab)
Menno Veldhorst (TU Delft - QN/Veldhorst Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
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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.
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