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Inferring Charge-Noise Source Locations from Correlations in Spin Qubits
J S Rojas-Arias1, A Noiri2, J Yoneda3
1RIKEN, Center for Quantum Computing (RQC), Wako-shi, Saitama 351-0198, Japan.
None:
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.
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