Supplementary Data: Differential Population Retention in Multi-Qubit GHZ States — Cross-Platform Benchmarking with Parity Certification (v5.1)

Raw measurement data (bitstring-level counts) from cross-platform quantum computing experiments on IBM Heron, IonQ Forte, IQM Garnet, Rigetti Ankaa-3, and IQM Emerald. Contains 31 JSON files with unmitigated results from GHZ-state parity oscillation witnesses (5–20 qubits), population-score benchmarks, and negative controls (W-state, cluster state). Includes scaling analysis files and a complete README with file catalog and reproducibility instructions. No error mitigation applied. See README.md for full details.