Conveyor-mode single-electron shuttling in Si/SiGe for a scalable quantum computing architecture
Small spin-qubit registers defined by single electrons confined in Si/SiGe quantum dots operate successfully and connecting these would permit scalable quantum computation. Shuttling the qubit carrying electrons between registers is a natural choice for high-fidelity coherent links provided the over...
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| creator | Seidler, Inga Struck, Tom Xue, Ran Focke, Niels Trellenkamp, Stefan Bluhm, Hendrik Schreiber, Lars R |
| description | Small spin-qubit registers defined by single electrons confined in Si/SiGe quantum dots operate successfully and connecting these would permit scalable quantum computation. Shuttling the qubit carrying electrons between registers is a natural choice for high-fidelity coherent links provided the overhead of control signals stays moderate. Our proof-of-principle demonstrates shuttling of a single electron by a propagating wave-potential in an electrostatically defined 420 nm long Si/SiGe quantum-channel. This conveyor-mode shuttling approach requires independent from its length only four sinusoidal control signals. We discuss the tuning of the signal parameters, detect the smoothness of the electron motion enabling the mapping of potential disorder and observe a high single-electron shuttling fidelity of \(99.42\pm0.02\,\%\) including a reversal of direction. Our shuttling device can be readily embedded in industrial fabrication of Si/SiGe qubit chips and paves the way to solving the signal-fanout problem for a fully scalable semiconductor quantum-computing architecture. |
| doi_str_mv | 10.48550/arxiv.2108.00879 |
| format | Article |
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| subjects | Accuracy Chip formation Conveyors Electron spin Electrons Fanout Physics - Mesoscale and Nanoscale Physics Physics - Quantum Physics Quantum computing Quantum dots Qubits (quantum computing) Silicon germanides Single electrons Smoothness Wave propagation |
| title | Conveyor-mode single-electron shuttling in Si/SiGe for a scalable quantum computing architecture |
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