TY  - EJOUR
AU  - Struck, Tom
AU  - Volmer, Mats
AU  - Visser, Lino
AU  - Offermann, Tobias
AU  - Xue, Ran
AU  - Tu, Jhih-Sian
AU  - Trellenkamp, Stefan
AU  - Cywiński, Łukasz
AU  - Bluhm, Hendrik
AU  - Schreiber, Lars R.
TI  - Spin-EPR-pair separation by conveyor-mode single electron shuttling in Si/SiGe
PB  - arXiv
M1  - FZJ-2024-01805
PY  - 2023
AB  - 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.
KW  - Quantum Physics (quant-ph) (Other)
KW  - Mesoscale and Nanoscale Physics (cond-mat.mes-hall) (Other)
KW  - FOS: Physical sciences (Other)
LB  - PUB:(DE-HGF)25
DO  - DOI:10.48550/ARXIV.2307.04897
UR  - https://juser.fz-juelich.de/record/1023792
ER  -