Structural Protection of GHZ States Across Superconducting and Trapped-Ion Quantum Processors

Version 3.1: Extended cross-platform validation of structural coherence protection in GHZ entangled states. KEY FINDINGS:- GHZ states show 2.4-13.8× slower decay (IBM Heron) and +5-9% fidelity advantage (IonQ Forte) vs product states- Structural protection is GHZ-specific: W-states (-12%) and Cluster states (-38%) underperform product states on IonQ- Non-Markovian memory (N1) detected in trapped ions: Dynamical decoupling with Z-pulses improves GHZ protection by +2.99%, 5× stronger than IBM's +0.6%- Scaling confirmed from 3 to 7 qubits with 100% consistency across all measurements PLATFORMS:- IBM Heron: ibm_torino (r1), ibm_fez (r2), ibm_boston (r3)- IonQ Forte 1 (trapped ions, 36 qubits) EXPERIMENT DATES: January 15-18, 2026TOTAL INVESTMENT: ~$2,350 USD (IBM + AWS/IonQ) This version extends v2.1 (DOI: 10.5281/zenodo.18284373) with IonQ cross-platform validation, entanglement-type dependence analysis, and non-Markovian memory detection via dynamical decoupling.