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Foundations for Near-Term Quantum Natural Language Processing

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arxiv 2012.03755 v1 pith:NDAL3VQP submitted 2020-12-07 quant-ph cs.CL

classification quant-phcs.CL
keywords quantumlinguisticstructurelanguageqnlpcircuitsencodingmodel
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We provide conceptual and mathematical foundations for near-term quantum natural language processing (QNLP), and do so in quantum computer scientist friendly terms. We opted for an expository presentation style, and provide references for supporting empirical evidence and formal statements concerning mathematical generality. We recall how the quantum model for natural language that we employ canonically combines linguistic meanings with rich linguistic structure, most notably grammar. In particular, the fact that it takes a quantum-like model to combine meaning and structure, establishes QNLP as quantum-native, on par with simulation of quantum systems. Moreover, the now leading Noisy Intermediate-Scale Quantum (NISQ) paradigm for encoding classical data on quantum hardware, variational quantum circuits, makes NISQ exceptionally QNLP-friendly: linguistic structure can be encoded as a free lunch, in contrast to the apparently exponentially expensive classical encoding of grammar. Quantum speed-up for QNLP tasks has already been established in previous work with Will Zeng. Here we provide a broader range of tasks which all enjoy the same advantage. Diagrammatic reasoning is at the heart of QNLP. Firstly, the quantum model interprets language as quantum processes via the diagrammatic formalism of categorical quantum mechanics. Secondly, these diagrams are via ZX-calculus translated into quantum circuits. Parameterisations of meanings then become the circuit variables to be learned. Our encoding of linguistic structure within quantum circuits also embodies a novel approach for establishing word-meanings that goes beyond the current standards in mainstream AI, by placing linguistic structure at the heart of Wittgenstein's meaning-is-context.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Quantum Compositional NLP for Arabic: Grammar, Morphology, and Word Sense in Circuit Topology

    cs.CL 2026-05 conditional novelty 6.0 of 10

    On matched-pair Arabic word-order classification, quantum circuits with grammar-derived topology and one entangling layer score 64.9%, versus exactly 50% with no entanglement, isolating the causal contribution of enta...

  2. A Hybrid Quantum Circuit Born Machine Framework for Financial Volatility Forecasting: Quantum-Assisted Training and Classical Inference

    cs.LG 2026-03 unverdicted novelty 5.5 of 10

    LSTM trained with a QCBM generative prior beats a classical LSTM on SSE/CSI 300 realized volatility and retains much of that edge under zero-weight inference via Drop-Prior training.

  3. Compositional Concept Generalization with Variational Quantum Circuits

    cs.AI 2025-09 conditional novelty 5.0 of 10

    Variational quantum circuits with DisCoCat sentence structure outperform classical DisCoCat on a toy left/right image captioning benchmark, with MHE encodings working best and CLIP results near chance.

  4. QFFN-BERT: An Empirical Study of Depth, Performance, and Data Efficiency in Hybrid Quantum-Classical Transformers

    cs.CL 2025-07 reject novelty 4.0 of 10

    Replacing the feed-forward networks of a tiny BERT with four-qubit quantum circuits yielded 81.19% versus 79.59% on SST-2, but the result rests on a single seed and a CLS-only circuit application.

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