Abstract

Calibration loops are essential for maintaining cryogenic quantum devices under drift, stochastic readout variation, and device mismatch. This study presents an embedded closed-loop calibration architecture using a singleton Sugeno fuzzy controller with fixed-size arithmetic, bounded updates, and a lightweight telemetry interface. The emphasis is deterministic local execution rather than host-side optimization: each iteration performs measurement accumulation, probability estimation, error computation, fuzzy inference, and parameter update along a repeatable path. An executable Verilog-based evaluation model is used to evaluate convergence behavior, monitor-mode operation, and sensitivity to injected drift. The measured results show fast transition into monitor mode, fixed calibrated-parameter retention after convergence, and observable monitor-metric shifts under positive and negative perturbations. These results support the feasibility of compact embedded calibration for cryogenic quantum devices while keeping the controller structure simple, interpretable, and implementation-oriented.

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