Regularized Counterdiabatic Driving for the Quantum Rabi Model
The work introduces a variational optimization framework with physical renormalization to regularize trace-based metrics for counterdiabatic (CD) driving in continuous-variable quantum systems, specifically the quantum Rabi model. The method extends CD driving to arbitrary detuning ratios across various coupling regimes. Results show that these regularized metrics lead to a systematic increase in ground-state fidelity, achieving significant infidelity reduction compared to standard CD evolution.