🤖 AI Summary
This work investigates the potential of quantum machine learning (QML) to enhance classical intrusion detection systems (IDS) in cybersecurity, specifically within a principal component analysis (PCA)-based detection pipeline. We propose the first integration of quantum variational PCA (QV-PCA) into a conventional IDS workflow, introducing a dual encoding scheme—combining amplitude and angle encodings—tailored to network traffic features, and establishing a unified quantum–classical comparative evaluation framework. Experiments on the NSL-KDD dataset using Qiskit simulation demonstrate that QV-PCA achieves a 4.7× acceleration in feature compression while preserving 92.3% detection accuracy; under simulated noise, F1-score variation remains within ±1.2%, indicating preliminary robustness. Our key contribution is the novel, architecture-aware fusion of QV-PCA with operational IDS design, delivering a reproducible methodology and empirical benchmark for deploying QML in resource-constrained security applications.