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QSolver: A Quantum Constraint Solver

arXiv Quantum Physics
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⚡ Quantum Brief
Researchers Shangzhou Xia, Haitao Fu, and Jianjun Zhao introduced the first quantum constraint solver, addressing a critical gap in verifying quantum program correctness. Published in February 2026, their work adapts classical constraint-solving techniques to quantum computing. QSolver handles five distinct quantum constraint types, transforming programs and multi-moment constraints into symbolic representations. It leverages SMT solvers to generate quantum states satisfying these constraints, automating verification processes. The tool includes an automated assertion generation module to validate input states, creating corresponding assertion programs for each constraint. This ensures correctness without manual intervention. Experimental results demonstrate QSolver’s efficiency with common quantum gates and scalability across varying program sizes. Its performance suggests practical applicability for real-world quantum software development. The innovation bridges quantum physics and software engineering, offering a structured framework for constraint-based verification in quantum programming. It marks a significant step toward reliable quantum software validation.
QSolver: A Quantum Constraint Solver

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Quantum Physics arXiv:2602.20171 (quant-ph) [Submitted on 10 Feb 2026] Title:QSolver: A Quantum Constraint Solver Authors:Shangzhou Xia, Haitao Fu, Jianjun Zhao View a PDF of the paper titled QSolver: A Quantum Constraint Solver, by Shangzhou Xia and 2 other authors View PDF HTML (experimental) Abstract:With the growing interest in quantum programs, ensuring their correctness is a fundamental challenge. Although constraint-solving techniques can overcome some limitations of traditional testing and verification, they have not yet been sufficiently explored in the context of quantum programs. To address this gap, we present QSolver, the first quantum constraint solver. QSolver provides a structured framework for handling five types of quantum constraints and incorporates an automated assertion generation module to verify quantum states. QSolver transforms quantum programs and multi-moment constraints into symbolic representations, and utilizes an SMT solver to obtain quantum states that satisfy these constraints. To validate the correctness of the generated input states, QSolver automatically generates assertion programs corresponding to each constraint. Experimental results show that QSolver efficiently processes commonly used quantum gates and demonstrates good scalability across quantum programs of different sizes. Subjects: Quantum Physics (quant-ph); Software Engineering (cs.SE) Cite as: arXiv:2602.20171 [quant-ph] (or arXiv:2602.20171v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2602.20171 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Xia Shangzhou [view email] [v1] Tue, 10 Feb 2026 16:42:32 UTC (197 KB) Full-text links: Access Paper: View a PDF of the paper titled QSolver: A Quantum Constraint Solver, by Shangzhou Xia and 2 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-02 Change to browse by: cs cs.SE References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv (What is alphaXiv?) Links to Code Toggle CatalyzeX Code Finder for Papers (What is CatalyzeX?) DagsHub Toggle DagsHub (What is DagsHub?) GotitPub Toggle Gotit.pub (What is GotitPub?) Huggingface Toggle Hugging Face (What is Huggingface?) Links to Code Toggle Papers with Code (What is Papers with Code?) ScienceCast Toggle ScienceCast (What is ScienceCast?) Demos Demos Replicate Toggle Replicate (What is Replicate?) Spaces Toggle Hugging Face Spaces (What is Spaces?) Spaces Toggle TXYZ.AI (What is TXYZ.AI?) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower (What are Influence Flowers?) Core recommender toggle CORE Recommender (What is CORE?) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs. Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)

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Source: arXiv Quantum Physics