Using duality to construct and classify new quantum phases

February 3, 2026 Using duality to construct and classify new quantum phases by Kavli Institute for the Physics and Mathematics of the Universe edited by Sadie Harley, reviewed by Robert Egan Sadie Harley scientific editor Meet our editorial team Behind our editorial process Robert Egan associate editor Meet our editorial team Behind our editorial process Editors' notes This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: fact-checked peer-reviewed publication proofread The GIST Add as preferred source A schematic illustrating how duality maps Non-Invertible Symmetry-Protected Topological (NISTP) phases to Spontaneously Symmetry Broken (SSB) phases of ordinary group symmetries. Credit: Image created by Cao, Yamazaki, Li using ChatGPT and Gemini A team of theoretical researchers has found duality can unveil non-invertible symmetry protected topological phases, which can lead to researchers understanding more about the properties of these phases, and uncover new quantum phases. Their study is published in Physical Review Letters. Symmetry is one of the most fundamental concepts for understanding phases of matter in modern physics—in particular, symmetry-protected topological (SPT) phases, whose quantum mechanical properties are protected by symmetries, with possible applications in quantum computing and other fields. Over the past few years, non-invertible symmetries, which extend the framework of conventional symmetries, have attracted significant attention in high energy physics and condensed matter physics. However, their complex mathematical structures have made it difficult to understand their corresponding phases of matter, or SPT phases. In this study, a research group led by University of Southern Denmark Researcher Weiguang Cao, The University of Tokyo Department of Physics and Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI) Professor Masahito Yamazaki, and Ghent University Researcher Linhao Li (currently at Pennsylvania State University), successfully established a classification and construction method for topological phases protected by non-invertible symmetries, or SPT phases, by using a method known as duality. Duality refers to a mathematical equivalence between seemingly different physical systems. By using duality transformations, this complex problem could be reduced to a better-known physical phenomenon called phases with spontaneously broken conventional symmetries (SSB phases). This enabled researchers to classify SPT phases with non-invertible symmetries in arbitrary dimensions, and the successful construction of concrete models. The models constructed in this study offer important theoretical insights for applications in quantum technology, such as future quantum simulations and the design of quantum devices utilizing topological properties. Publication details Weiguang Cao et al, Duality Viewpoint of Noninvertible Symmetry-Protected Topological Phases, Physical Review Letters (2026). DOI: 10.1103/4zfz-x9xh. On arXiv: DOI: 10.48550/arxiv.2502.20435 Journal information: Physical Review Letters , arXiv Key concepts Quantum field theoryTopological phases of matterSymmetries in condensed matter Provided by Kavli Institute for the Physics and Mathematics of the Universe Citation: Using duality to construct and classify new quantum phases (2026, February 3) retrieved 9 February 2026 from https://phys.org/news/2026-02-duality-quantum-phases.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. 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