Shuttling an electron spin through a silicon quantum dot array

Abstract

Coherent links between qubits separated by tens of micrometers are expected to facilitate scalable quantum computing architectures for spin qubits in electrically-defined quantum dots. These links create space for classical on-chip control electronics between qubit arrays, which can help to alleviate the so-called wiring bottleneck. A promising method of achieving coherent links between distant spin qubits consists of shuttling the spin through an array of quantum dots. Here, we use a linear array of four tunnel-coupled quantum dots in a 28Si/SiGe heterostructure to create a short quantum link. We move an electron spin through the quantum dot array by adjusting the electrochemical potential for each quantum dot sequentially. By pulsing the gates repeatedly, we shuttle an electron forward and backward through the array up to 250 times, which corresponds to a total distance of approximately 80 μm. We make an estimate of the spin-flip probability per hop in these experiments and conclude that this is well below 0.01% per hop.

11 pages, 3 main figures, 6 appendix figures

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Cited by in corpus (34)

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• Si/SiGe QuBus for single electron information-processing devices with memory and micron-scale connectivity function
• Coherent spin qubit shuttling through germanium quantum dots
• Low disorder and high valley splitting in silicon
• High-fidelity single-spin shuttling in silicon
• Strategies for enhancing spin-shuttling fidelities in Si/SiGe quantum wells with random-alloy disorder
• High-fidelity spin qubit shuttling via large spin-orbit interaction
• Materials for Quantum Technologies: a Roadmap for Spin and Topology
• Understanding disorder in Silicon quantum computing platforms: Scattering mechanisms in Si/SiGe quantum wells
• Extended Hubbard model describing small multi-dot arrays in bilayer graphene
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• Multi-qubit DC gates over an inhomogeneous array of quantum dots
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• Coupling a ${}^{73}$Ge nuclear spin to an electrostatically defined quantum dot
• Switchable spin-photon coupling with hole spins in single-quantum dots