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We detect correlations in qubit-energy fluctuations of non-neighboring qubitsdefined in isotopically purified Si/SiGe quantum dots. At low frequencies(where the noise is strongest), the correlation coefficient reaches 10% for anext-nearest-neighbor qubit-pair separated by 200 nm. Assigning the observednoise to be of electrical origin, a simple theoretical model quantitativelyreproduces the measurements and predicts a polynomial decay of correlationswith interqubit distance. Our results quantify long-range correlations of noisedephasing quantum-dot spin qubits arranged in arrays, essential for scalabilityand fault-tolerance of such systems.

Spatial noise correlations beyond nearest-neighbor in ${}^{28}$Si/SiGe spin qubits