Cross-Ecosystem Bug Classification in Quantum Software
This study addresses the complex and poorly understood defects arising from interactions between classical and quantum components in quantum software, where existing research lacks a unified, cross-ecosystem classification methodology. The work proposes the first rule-driven, interpretable, and automatable classification framework, systematically annotating and comparing 17,523 issues across 12 repositories—including Qiskit, Cirq, and PyQuil—along dimensions of defect type, severity, quality attributes, and quantum-specific subcategories. Through statistical validation, machine learning baselines, and longitudinal trend analysis (2017–2025), the study reveals that classical defects constitute 67% of all issues, while quantum-specific defects remain stable at 27–30%, with significant ecosystem-level variations (e.g., prominent compatibility issues in Qiskit). The proposed framework substantially outperforms data-driven models in fine-grained quantum defect identification.