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From the 1 of 5 linked papers with an AI index.

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5 papers

quant-ph2026

Pair-Partition Constructions for CPM-Based Quantum LDPC Codes

Koki Okada, Kenta Kasai

The paper presents a method to build binary CSS quantum LDPC codes using circulant permutation matrices and pair-partition equations, providing several regular codes with specified…

quant-ph2026

Rate-2/3 Girth-8 (3,18)-Regular Quantum LDPC Codes from Two-Branch Finite-Field Bases and CPM Lifts

Koki Okada, Kenta Kasai

We construct a rate- quantum low-density parity-check (LDPC) code from a -regular two-branch finite-field base and a circulant-permutation-matrix (CPM) lift of degree…

quant-ph2026

A Two-Branch Finite-Field Construction for Regular CSS LDPC Bases

Koki Okada, Kenta Kasai

This paper develops a two-branch multiplicative-coset construction for regular Calderbank-Shor-Steane (CSS) quantum low-density parity-check base matrices. For a target column weig…

quant-ph2026

High-Girth Regular Quantum LDPC Codes from Square-Base Hypergraph Products via CPM Lifts

Koki Okada, Kenta Kasai

We study square-base Calderbank--Shor--Steane (CSS) hypergraph-product codes as a finite-length class for regular high-girth quantum low-density parity-check (LDPC) design. For bas…

quant-ph2026

High-Girth Regular Quantum LDPC Codes from Affine-Coset Structures

Koki Okada, Kenta Kasai

We construct a quantum low-density parity-check code family from a length- Calderbank--Shor--Steane base matrix pair. The base pair is permutation-equivalent to the known SPC(…