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Updated: Jul 3, 2025

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

Tom Struck1,2, Mats Volmer1, Lino Visser1

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|February 13, 2024
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Summary
This summary is machine-generated.

Spin shuttling enables scalable quantum computing by moving electrons coherently. This research demonstrates high-fidelity spin shuttling over long distances, preserving quantum entanglement for future silicon quantum chips.

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Area of Science:

  • Quantum Computing
  • Quantum Information Science
  • Solid-State Physics

Background:

  • Scalable quantum computing requires robust qubit coupling mechanisms.
  • Spin qubits offer a promising platform for quantum computation in silicon.
  • Existing methods lack efficient long-range coherent coupling for scaling.

Purpose of the Study:

  • To investigate spin coherence during conveyor-mode electron shuttling.
  • To assess the feasibility of conveyor-mode shuttling for scalable quantum computing architectures.
  • To quantify spin-shuttle infidelity and entanglement preservation over extended distances.

Main Methods:

  • Utilized conveyor-mode electron shuttling to transport an Einstein-Podolsky-Rosen (EPR) spin-pair.
  • Increased shuttle velocity by 10,000 times compared to previous studies.
  • Measured spin coherence and entanglement fidelity after shuttling over distances up to 3.36 μm.

Main Results:

  • Observed increased spin-qubit dephasing time with longer shuttle distances due to motional narrowing.
  • Estimated spin-shuttle infidelity due to dephasing at 0.7% for a 560 nm shuttle distance.
  • Detected spin entanglement of the EPR pair after shuttling through multiple loops (3.36 μm accumulated distance).

Conclusions:

  • Conveyor-mode electron shuttling maintains spin coherence and entanglement over significant distances.
  • This technique is compatible with industrial fabrication and requires minimal control terminals.
  • Spin shuttling presents a viable pathway for building scalable, sparse qubit architectures in silicon.