Data and code for: Reference-Free Symmetry Diagnostics for Trotterized Quantum Simulation: Complementary Blind Spots and a Hardware Defect Missed by Calibration

Raw data and analysis code for "Reference-Free Symmetry Diagnostics for Trotterized Quantum Simulation: Complementary Blind Spots and a Hardware Defect Missed by Calibration" (J. W. Recha, 2026). Eight-qubit transverse-field Ising chain, first-order Trotter circuits, run on three IBM Heron r2 processors (ibm_fez, ibm_marrakesh, ibm_kingston). Contents: the 102 campaign records (13 Sep 2026; qiskit 2.5.2, qiskit-ibm-runtime 0.49.0), 6 pilot records (12 Sep), the ibm_kingston follow-up and readout tests (15 and 23 Sep), the cross-device controls (16 Sep), the acquisition scripts as they were run, and the analysis scripts that reproduce every number and figure in the paper (python3 code/analysis/reproduce.py, no IBM account needed). See README.md for the layout.