Home > Publications database > Reduction of the impact of the local valley splitting on the coherence of conveyor-belt spin shuttling in $^{28}$Si/SiGe > print

001     1049183
005     20251211202159.0
024 7 _ |a 10.48550/ARXIV.2510.03773
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037 _ _ |a FZJ-2025-05266
100 1 _ |a Volmer, Mats
|0 P:(DE-Juel1)196668
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245 _ _ |a Reduction of the impact of the local valley splitting on the coherence of conveyor-belt spin shuttling in $^{28}$Si/SiGe
260 _ _ |c 2025
|b arXiv
336 7 _ |a Preprint
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336 7 _ |a Electronic Article
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520 _ _ |a Silicon quantum chips offer a promising path toward scalable, fault-tolerant quantum computing, with the potential to host millions of qubits. However, scaling up dense quantum-dot arrays and enabling qubit interconnections through shuttling are hindered by uncontrolled lateral variations of the valley splitting energy $E_{VS}$. We map $E_{VS}$ across a $40 \, $nm x $400 \, $nm region of a $^{28}$Si/Si$_{0.7}$Ge$_{0.3}$ shuttle device and analyze the spin coherence of a single electron spin transported by conveyor-belt shuttling. We observe that the $E_{VS}$ varies over a wide range from $1.5 \, μ$eV to $200 \, μ$eV and is dominated by SiGe alloy disorder. In regions of low $E_{VS}$ and at spin-valley resonances, spin coherence is reduced and its dependence on shuttle velocity matches predictions. Rapid and frequent traversal of low-$E_{VS}$ regions induces a regime of enhanced spin coherence explained by motional narrowing. By selecting shuttle trajectories that avoid problematic areas on the $E_{VS}$ map, we achieve transport over tens of microns with coherence limited only by the coupling to a static electron spin entangled with the mobile qubit. Our results provide experimental confirmation of the theory of spin-decoherence of mobile electron spin-qubits and present practical strategies to integrate conveyor-mode qubit shuttling into silicon quantum chips.
536 _ _ |a 5221 - Advanced Solid-State Qubits and Qubit Systems (POF4-522)
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588 _ _ |a Dataset connected to DataCite
650 _ 7 |a Quantum Physics (quant-ph)
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650 _ 7 |a FOS: Physical sciences
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700 1 _ |a Struck, Tom
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700 1 _ |a Tu, Jhih-Sian
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700 1 _ |a Trellenkamp, Stefan
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700 1 _ |a Esposti, Davide Degli
|0 P:(DE-HGF)0
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700 1 _ |a Scappucci, Giordano
|0 P:(DE-HGF)0
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700 1 _ |a Cywiński, Łukasz
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700 1 _ |a Bluhm, Hendrik
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700 1 _ |a Schreiber, Lars R.
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773 _ _ |a 10.48550/ARXIV.2510.03773
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