Beyond Static Secrecy: A Self-Adaptive, Noise-Aware Privacy Amplification Framework for Heterogeneous 6G Quantum-Secured Networks.

Modern Quantum Key Distribution (QKD) often fails in highly dynamic mobile environments due to rigid post-processing architectures. This paper introduces a pioneering self-adaptive privacy amplification (SAPA) framework that replaces traditional static compression with a closed-loop controller. By integrating twelve distinct quantum noise models—including Non-Markovian and Gaussian Bosonic channels—we demonstrate that real-time entropy estimation can reclaim up to 25% of secure key material previously lost in mobile-induced fluctuations. Our results establish a new paradigm for \\\"living\\\" security in future 6G ecosystems.