Inferring Charge-Noise Source Locations from Correlations in Spin Qubits
J. S. Rojas-Arias
A. Noiri (RIKEN Center for Emergent Matter Science (CEMS))
J. Yoneda (University of Tokyo)
P. Stano (TU Delft - OLD Intelligent Control & Robotics)
K. Takeda (TU Delft - Aerospace Engineering, RIKEN Center for Emergent Matter Science (CEMS))
T. Kobayashi (TU Delft - Mathematical Geodesy and Positioning)
G. Scappucci (TU Delft - Quantum Circuit Architectures and Technology, Kavli institute of nanoscience Delft, TU Delft - QCD/Scappucci Lab)
S. Tarucha (TU Delft - QN/Theoretical Physics, RIKEN Center for Emergent Matter Science (CEMS))
D. Loss (University of Basel, TU Delft - QN/Quantum Transport)
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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.
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