RQC Colloquium

49th RQC Colloquium

  • 講演者

    Prof. Kenta Kasai
    (Institute of Science Tokyo)

  • 日程

    2026年10月14日（水）16:00-17:00 (4:00p.m.-5:00p.m.)（JST）

  • 開催場所

    Hybrid (Zoom・和光地区 統合支援施設2階 大会議室 / Large Meeting Room, 2F, Welfare and Conference Building, Wako Campus (C61))

  • 講演タイトル

    Ultra-High-Rate Quantum LDPC Codes

  • お問合せ

    rqc_colloquium_inquiry[at]ml.riken.jp

  • 登録フォーム

    https://krs2.riken.jp/m/rqc_registration_form

講演概要
Quantum low-density parity-check (LDPC) codes have attracted growing interest in quantum error correction. This talk is aimed at a broad audience and begins with a review of the basic ideas and history of classical and quantum LDPC codes: what LDPC codes are, how their sparse structure is used for error correction, and what additional constraints arise in the quantum setting. I will briefly touch on surface codes as an example of a geometric construction, while focusing on the development of quantum LDPC codes and the motivation for ultra-high-rate codes with low check weight.

In the second half, I will introduce the ideas behind our pair-partition (PP) construction of quantum LDPC codes built from circulant permutation matrices. I will explain how a simple pairing principle ensures that stabilizer checks commute and helps us search for codes with desirable properties. I will also describe the basic idea of certifying a lower bound on the minimum distance by ruling out low-weight nontrivial logical operators, and how cyclic symmetry makes this verification more manageable. The emphasis throughout is on the underlying ideas and the connection between code construction and computational verification.
Flyer: 49th RQC Colloquium Flyer

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