Exploring the Effects of Entanglement on Quantum Machine Learning of Pathogen Epitope-Receptor Binding

• URL: http://arxiv.org/abs/2606.28655v1
• Date: Sat, 27 Jun 2026 00:11:37 GMT
• Title: Exploring the Effects of Entanglement on Quantum Machine Learning of Pathogen Epitope-Receptor Binding
• Abstract summary: We study how the number and topology of two-qubit entangling gates in the featuremap influence a hybrid QNN workflow for classifying strong versus weak-receptor binding.<n>We compare a classical CNN benchmark with a hybrid QNN architecture under four feature-map configurations.<n>Among the tested, the high-entanglement ZZ feature map is seen to provide the strongest evidence of reduced training-set overfit.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Parameterized quantum circuits (PQCs) provide a flexible substrate for hybrid quantum machine learning (QML), but their practical value on Noisy Intermediate-Scale Quantum (NISQ) devices remains an empirical question, especially because training depth and scale can introduce optimization challenges such as barren plateaus. Here we study how the number and topology of two-qubit entangling gates in the feature-map stage influence a fixed hybrid QNN workflow for classifying strong versus weak epitope-receptor binding in Porcine Reproductive and Respiratory Syndrome (PRRS) vaccine design. The dataset consists of docking-derived binding affinities for N=80 9-mer epitopes, labeled as Strong or Weak binding, and partitioned into training, validation, and test subsets using a 40:30:30 split. We compare a classical CNN benchmark with a hybrid Embedding-QNN architecture under four feature-map configurations: a non-entangling Z feature map, an all-to-all high-entanglement ZZ feature map, and two interleaved nearest-neighbour entanglement patterns of low and high depth. Among the configurations tested, the high-entanglement ZZ feature map is seen to provide the strongest evidence of reduced training-set overfit, with a lower training area under the accuracy curve (AUAC) and the highest test/training AUAC ratio, while preserving competitive test-set accuracy. These results do not establish a general QML advantage, but they suggest that feature-map entanglement topology is a meaningful design variable for sparse biological screening tasks and warrants further evaluation with additional metrics, larger datasets, and noise-aware or hardware-based experiments.

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