Spatial noise correlations beyond nearest neighbors in 28Si/ Si-Ge spin qubits

Journal article (2023)

Authors

J. S. Rojas-Arias RIKEN Center for Emergent Matter Science (CEMS)
Akito Noiri RIKEN Center for Emergent Matter Science (CEMS)
P. Stano RIKEN Center for Emergent Matter Science (CEMS)
Takashi Nakajima RIKEN Center for Emergent Matter Science (CEMS)
J. Yoneda Tokyo Institute of Technology
K. Takeda RIKEN Center for Emergent Matter Science (CEMS), Aerospace Engineering
T. Kobayashi RIKEN Center for Emergent Matter Science (CEMS)
A. Sammak BUS/TNO STAFF - QuTech Advanced Research Centre , QuTech Advanced Research Centre
G. Scappucci Kavli institute of nanoscience Delft, QuTech Advanced Research Centre, QCD/Scappucci Lab - QuTech Advanced Research Centre
Research Group
BUS/TNO STAFF (QuTech Advanced Research Centre) (TU Delft)
Copyright: © 2023 J. S. Rojas-Arias, A. Noiri, P. Stano, T. Nakajima, J. Yoneda, K. Takeda, T. Kobayashi, A. Sammak, G. Scappucci
DOI: https://doi.org/10.1103/PhysRevApplied.20.054024
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Published Date

2023

Language

English

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Faculty

QuTech Advanced Research Centre

Department

Business Development

Research Group

BUS/TNO STAFF

Abstract

We detect correlations in qubit-energy fluctuations of non-neighboring qubits defined in isotopically purified Si/Si-Ge quantum dots. At low frequencies (where the noise is strongest), the correlation coefficient reaches 10% for a next-nearest-neighbor qubit-pair separated by 200 nm. Correlations with the charge-sensor signal reach up to 70%, proving that the observed noise is of electrical origin. A simple theoretical model quantitatively reproduces the measurements and predicts a polynomial decay of correlations with interqubit distance. Our results quantify long-range correlations of noise in quantum-dot spin-qubit arrays, essential for their scalability and fault tolerance.