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Spin-EPR-pair separation by conveyor-mode single electron shuttling in Si/SiGe

Author

Listed:
  • Tom Struck

    (Forschungszentrum Jülich GmbH and RWTH Aachen University
    ARQUE Systems GmbH)

  • Mats Volmer

    (Forschungszentrum Jülich GmbH and RWTH Aachen University)

  • Lino Visser

    (Forschungszentrum Jülich GmbH and RWTH Aachen University)

  • Tobias Offermann

    (Forschungszentrum Jülich GmbH and RWTH Aachen University)

  • Ran Xue

    (Forschungszentrum Jülich GmbH and RWTH Aachen University)

  • Jhih-Sian Tu

    (Helmholtz Nano Facility (HNF), Forschungszentrum Jülich)

  • Stefan Trellenkamp

    (Helmholtz Nano Facility (HNF), Forschungszentrum Jülich)

  • Łukasz Cywiński

    (Polish Academy of Sciences)

  • Hendrik Bluhm

    (Forschungszentrum Jülich GmbH and RWTH Aachen University
    ARQUE Systems GmbH)

  • Lars R. Schreiber

    (Forschungszentrum Jülich GmbH and RWTH Aachen University
    ARQUE Systems GmbH)

Abstract

Long-ranged coherent qubit coupling is a missing function block for scaling up spin qubit based quantum computing solutions. Spin-coherent conveyor-mode electron-shuttling could enable spin quantum-chips with scalable and sparse qubit-architecture. Its key feature is the operation by only few easily tuneable input terminals and compatibility with industrial gate-fabrication. Single electron shuttling in conveyor-mode in a 420 nm long quantum bus has been demonstrated previously. Here we investigate the spin coherence during conveyor-mode shuttling by separation and rejoining an Einstein-Podolsky-Rosen (EPR) spin-pair. Compared to previous work we boost the shuttle velocity by a factor of 10000. We observe a rising spin-qubit dephasing time with the longer shuttle distances due to motional narrowing and estimate the spin-shuttle infidelity due to dephasing to be 0.7% for a total shuttle distance of nominal 560 nm. Shuttling several loops up to an accumulated distance of 3.36 μm, spin-entanglement of the EPR pair is still detectable, giving good perspective for our approach of a shuttle-based scalable quantum computing architecture in silicon.

Suggested Citation

  • Tom Struck & Mats Volmer & Lino Visser & Tobias Offermann & Ran Xue & Jhih-Sian Tu & Stefan Trellenkamp & Łukasz Cywiński & Hendrik Bluhm & Lars R. Schreiber, 2024. "Spin-EPR-pair separation by conveyor-mode single electron shuttling in Si/SiGe," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45583-7
    DOI: 10.1038/s41467-024-45583-7
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    1. Xiao Xue & Maximilian Russ & Nodar Samkharadze & Brennan Undseth & Amir Sammak & Giordano Scappucci & Lieven M. K. Vandersypen, 2022. "Quantum logic with spin qubits crossing the surface code threshold," Nature, Nature, vol. 601(7893), pages 343-347, January.
    2. Akito Noiri & Kenta Takeda & Takashi Nakajima & Takashi Kobayashi & Amir Sammak & Giordano Scappucci & Seigo Tarucha, 2022. "Fast universal quantum gate above the fault-tolerance threshold in silicon," Nature, Nature, vol. 601(7893), pages 338-342, January.
    3. T. F. Watson & S. G. J. Philips & E. Kawakami & D. R. Ward & P. Scarlino & M. Veldhorst & D. E. Savage & M. G. Lagally & Mark Friesen & S. N. Coppersmith & M. A. Eriksson & L. M. K. Vandersypen, 2018. "A programmable two-qubit quantum processor in silicon," Nature, Nature, vol. 555(7698), pages 633-637, March.
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    Cited by:

    1. Ran Xue & Max Beer & Inga Seidler & Simon Humpohl & Jhih-Sian Tu & Stefan Trellenkamp & Tom Struck & Hendrik Bluhm & Lars R. Schreiber, 2024. "Si/SiGe QuBus for single electron information-processing devices with memory and micron-scale connectivity function," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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