This repository presents empirical evidence that quantum mutual Information (I_Q) measurably reduces the effective decoherence rate (γ_eff) in real IBM Quantum superconducting hardware, across three independent processors: Kingston Heron r2, Fez Heron r2, and Marrakech Heron r2. Approximately 121 hardware circuits were executed across three experimental protocols: (1) Protocol P7 on IBM Kingston (~60 circuits): primary extraction of the informational shielding constant λ = 0.18122 ± 0.00046 nats⁻¹, with hardware-independent consistency index OmegaHI = 0.24. (2) Causality and confirmation protocol on IBM Fez (23 circuits): independent corroboration that higher I_Q states exhibit systematically lower γ_eff, consistent with the saturated exponential model. (3) Scalability protocol on IBM Marrakech (25 circuits): confirmation of the I_Q effect across circuit depths; λ extraction on this platform remains an open objective requiring further experimental runs. The empirical results are described by: γ(I_Q) = γ_min + (σ − γ_min) · exp(−α · I_Q²) with fitted parameters γ_min = 0.00248, σ = 0.01290, α = 203.4, R² = 0.7833, extracted from IBM Kingston hardware data. Negative controls confirm that the observed effect is not an artifact of circuit depth or hardware noise floor. The pattern is consistent across all three IBM processors. This work is presented as preliminary empirical evidence requiring independent peer review and replication on non-IBM hardware architectures. Full raw data, circuit specifications (OpenQASM 2.0), and analysis code are included for complete reproducibility. Ignacio Giménez Moreno. igimor1@gmail.com ORCID: 0009-0007-2052-1291