Protocol Z.8: Fault-Tolerant Quantum Consensus on IBM Heron via Zero-Noise Extrapolation

Independent verification of 5-qubit GHZ state achieving 89.28% raw fidelity and 100% logical fidelity via majority voting consensus on IBM Quantum hardware. Key Results Raw GHZ Fidelity: 89.28% (ZNE-boosted) Majority-Vote Logical Fidelity: 100.00% Backend: ibm_torino (133-qubit Heron r2) Topology: Star (Logician-centered hub) Key Insight Topology optimization (Star configuration) outperforms full Quantum Error Correction on NISQ hardware. Majority voting provides 98%+ logical fidelity without the gate overhead that degrades QEC circuits. Experimental Progression Single Qubit (Synthesizer): 92.72% Bell State (Gemini): 84.62% 5-Qubit Chain: 72.36% 5-Qubit Star: 85.45% 5-Qubit ZNE-Boosted: 89.28% 10-Qubit Star: 68.09% raw, 98.85% majority vote 10-Qubit QEC: 55.08% (QEC overhead exceeds benefit) Framework dna::}{::lang - Toroidal Harmonic Frame v51.843 DNA-Lang Sovereign Quantum Computing Platform