Spatial noise correlations beyond nearest neighbors in 28Si/Si-Ge spin qubits
article
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.
Topics
TNO Identifier
990969
DOI
https://dx.doi.org/10.1103/PhysRevApplied.20.054024
ISSN
23317019
Source
Physical Review Applied, 20(5)
Publisher
American Physical Society APS
Article nr.
054024
Collation
13 p.
Files
To receive the publication files, please send an e-mail request to TNO Repository.