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
ISSN
23317019
Source
Physical Review Applied, 20(5)
Publisher
American Physical Society APS
Article nr.
054024
Collation
13 p.
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