A Hybrid Quantum-Classical Fusion for Deep Semantic Paraphrase Detection

Devanarayanan K, Fayas S Mohamad, Dheeraj V Mohan, Reshma Sheik


Abstract
Paraphrase Detection is a core task in natural language processing (NLP) that aims to determine whether two sentences convey equivalent meanings. This work proposes a hybrid quantum–classical framework that integrates Sentence-BERT embeddings, simulated quantum feature encoding, and classical machine learning models to enhance semantic similarity detection. Initially, sentence pairs are embedded using Sentence-BERT and standardized through feature scaling. These representations are then transformed via rotation-based quantum circuits to capture higher-order feature interactions and non-linear dependencies. The resulting hybrid feature space, combining classical and quantum-inspired components, is evaluated using LightGBM and deep neural network classifiers. Experimental results show that the hybrid model incorporating quantum-inspired features achieved superior classification performance, yielding a 10% improvement in overall accuracy outperforming standalone deep learning baselines. These findings demonstrate that quantum–classical fusion enhances semantic feature extraction and significantly improves paraphrase detection performance.
Anthology ID:
2025.quantumnlp-1.4
Volume:
Proceedings of the QuantumNLP{:} Integrating Quantum Computing with Natural Language Processing
Month:
November
Year:
2025
Address:
Mumbai, India (Hybrid)
Editors:
Santanu Pal, Partha Pakray, Priyanka Jain, Asif Ekbal, Sivaji Bandyopadhyay
Venues:
QuantumNLP | WS
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Publisher:
Association for Computational Linguistics
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Pages:
20–25
Language:
URL:
https://preview.aclanthology.org/ingest-ijcnlp-aacl/2025.quantumnlp-1.4/
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Bibkey:
Cite (ACL):
Devanarayanan K, Fayas S Mohamad, Dheeraj V Mohan, and Reshma Sheik. 2025. A Hybrid Quantum-Classical Fusion for Deep Semantic Paraphrase Detection. In Proceedings of the QuantumNLP{:} Integrating Quantum Computing with Natural Language Processing, pages 20–25, Mumbai, India (Hybrid). Association for Computational Linguistics.
Cite (Informal):
A Hybrid Quantum-Classical Fusion for Deep Semantic Paraphrase Detection (K et al., QuantumNLP 2025)
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https://preview.aclanthology.org/ingest-ijcnlp-aacl/2025.quantumnlp-1.4.pdf