Inferring charge-noise source locations from correlations in spin qubits
arXiv:2505.05875 · doi:10.1103/glp5-bb5b
Abstract
We investigate low-frequency noise in a spin-qubit device made in isotopically purified Si/Si-Ge. Observing sizable cross-correlations among energy fluctuations of different qubits, we conclude that these fluctuations are dominated by charge noise. At low frequencies, the noise spectra are not well described by a power law; instead, they reveal the presence of a few individual two-level fluctuators (TLFs). We demonstrate that the noise cross-correlations allow one to get information on the spatial location of such individual TLFs.
Main text: 7 pages, 5 figures. Supplemental material: 9 pages, 8 figures. Supporting Data: https://doi.org/10.5281/zenodo.18013360