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    Anyon Theory and Topological Frustration of High-Efficiency Quantum Low-Density Parity-Check Codes

    Keyang Chen1,2,3, Yuanting Liu1,3, Yiming Zhang2,4, Zijian Liang5, Yu-An Chen5, Ke Liu2,4,*, and Hao Song1,†

    • *Contact author: ke.liu@ustc.edu.cn
    • †Contact author: songhao@itp.ac.cn

    Phys. Rev. Lett. 135, 076603 – Published 14 August, 2025

    DOI: https://doi.org/10.1103/86j7-cmsw

    Abstract

    Quantum low-density parity-check (QLDPC) codes offer a promising path to low-overhead fault-tolerant quantum computation but lack systematic strategies for exploration. In this Letter, we establish a topological framework for studying the bivariate-bicycle codes, a prominent class of QLDPC codes tailored for real-world quantum hardware. Our framework enables the investigation of these codes through universal properties of topological orders. In addition to efficient characterizations using Gröbner bases, we also introduce a novel algebraic-geometric approach based on the Bernstein-Khovanskii-Kushnirenko theorem. This approach allows us to analytically determine how the topological order varies with the generic choices of bivariate-bicycle codes under toric layouts. Novel phenomena are unveiled, including topological frustration, where ground-state degeneracy on a torus deviates from the total anyon number, and quasifractonic mobility, where anyon movement violates energy conservation. We demonstrate their intrinsic link to symmetry-enriched topological orders and derive an efficient method for generating finite-size codes. Furthermore, we extend the connection between anyons and logical operators using Koszul complex theory. Our Letter provides a rigorous theoretical basis for exploring the fault tolerance of QLDPC codes and deepens the interplay among topological order, quantum error correction, and advanced algebraic structures.

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