%0 Electronic Article
%A Struck, Tom
%A Volmer, Mats
%A Visser, Lino
%A Offermann, Tobias
%A Xue, Ran
%A Tu, Jhih-Sian
%A Trellenkamp, Stefan
%A Cywiński, Łukasz
%A Bluhm, Hendrik
%A Schreiber, Lars R.
%T Spin-EPR-pair separation by conveyor-mode single electron shuttling in Si/SiGe
%I arXiv
%M FZJ-2024-01805
%D 2023
%X 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 $μ$m, 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.
%K Quantum Physics (quant-ph) (Other)
%K Mesoscale and Nanoscale Physics (cond-mat.mes-hall) (Other)
%K FOS: Physical sciences (Other)
%F PUB:(DE-HGF)25
%9 Preprint
%R 10.48550/ARXIV.2307.04897
%U https://juser.fz-juelich.de/record/1023792