Genuine Multifractality in Superconducting Qubit 1/f Calibration Noise: Evidence for Nonlinear Dynamics and Compatibility with Beck's Cosmological Hypothesis

Key Points

• This research aims to investigate the multifractality in superconducting qubit calibration noise and its implications for nonlinear dynamics.
• Analyzed 778 days of IBM Quantum data and cross-platform noise sources.
• Applied Bayesian DFA to assess the multifractality.
• Examined linear and nonlinear dynamics through TLS cascades and cross-correlations.
• Observed extreme genuine multifractality with parameters Δh = 3–6 and z > 18σ.
• Found α = 1.013 ± 0.012, consistent with Beck’s cosmological hypothesis.
• Differentiated between intrinsic nonlinear dynamics and purely linear cosmic ray effects.