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Inferring charge noise source locations from correlations in spin qubits (2505.05875v1)
Published 9 May 2025 in cond-mat.mes-hall and quant-ph
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 do not fit well a power law; rather, we can recognize 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.
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