MPC4-Q: A Preliminary Logic-Operational Immunity Layer for Quantum Information Recovery on IBM Marrakesh

This preliminary technical report introduces MPC4-Q, an external logic-operational immunity layer for quantum information recovery on real IBM Quantum hardware. The system does not claim to improve physical qubit lifetime. Instead, it searches for recoverable quantum information paths under real hardware noise and certifies them using raw success, readout mitigation, Wilson lower-bound statistics and MELON reliability. The experimental campaign was executed on IBM Marrakesh under a constrained runtime budget. The main IBM run evaluated MELON-ENTANGLE v3 at depth 1 using physical layout selection, scout/exploit phases, readout calibration, raw count collection and Wilson-bound acceptance. The best exploit candidate used depth 1, challenge state 000, mode melon, variant 2 and layoutᵢd 3. It obtained 8055 successes over 8192 shots, with rawₛuccess = 0. 9832763671875, mitigatedₛuccess = 0. 9919348111472791, Wilson99 lower bound = 0. 9792164071213207 and MELON reliability = 0. 9850393690738396. The result is intentionally reported conservatively: although readout-mitigated success exceeded 99%, the experiment did not pass the strict 99-Gate because the Wilson 99% lower bound remained below 0. 99. This makes the dataset useful as an honest preliminary benchmark for logic-operational quantum information recovery on noisy cloud-accessible quantum hardware. The uploaded material includes the bilingual paper, LaTeX source package, experimental figures, CSV metric summaries and JSON metadata files. These files document the IBM backend, job identifiers, raw counts, circuit metadata, readout confusion matrices, scout metrics, exploit metrics and summary metrics. The implementation code is not released in this preliminary version and is planned for release after additional validation in a future IBM runtime window.