Preprint

FZJ-2025-02062

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Long distance spin shuttling enabled by few-parameter velocity optimization

David, A.FZJ* ; Pazhedath, A. M.FZJ* ; Schreiber, L.FZJ* ; Calarco, T.FZJ* ; Bluhm, H.FZJ* ; Motzoi, F.FZJ*

2024
arXiv

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Please use a persistent id in citations: doi:10.48550/ARXIV.2409.07600  doi:10.48550/arXiv.2409.07600  doi:10.34734/FZJ-2025-02062

Abstract: Spin qubit shuttling via moving conveyor-mode quantum dots in Si/SiGe offers a promising route to scalable miniaturized quantum computing. Recent modeling of dephasing via valley degrees of freedom and well disorder dictate a slow shutting speed which seems to limit errors to above correction thresholds if not mitigated. We increase the precision of this prediction, showing that typical errors for 10 $μ$m shuttling at constant speed results in O(1) error, using fast, automatically differentiable numerics and including improved disorder modeling and potential noise ranges. However, remarkably, we show that these errors can be brought to well below fault-tolerant thresholds using trajectory shaping with very simple parametrization with as few as 4 Fourier components, well within the means for experimental in-situ realization, and without the need for targeting or knowing the location of valley near degeneracies.

Keyword(s): Quantum Physics (quant-ph) ; Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ; FOS: Physical sciences

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Contributing Institute(s):

1. Quantum Control (PGI-8)
2. JARA Institut Quanteninformation (PGI-11)

Research Program(s):

1. 5221 - Advanced Solid-State Qubits and Qubit Systems (POF4-522) (POF4-522)

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