Modeling Charge Noise in Superconducting Qubits Using Memory Multi-Fractional Brownian Motion

We introduce a novel stochastic model for charge noise in superconducting charge qubits based on memory multi-fractional Brownian motion (mmfBm), capable of capturing non- stationary and long-memory effects. This framework reproduces key experimental fea- tures of decoherence and offers new insights into environmental interactions with supercon- ducting quantum devices.