# Construction Data for arXiv:2605.23894

This directory contains public homepage data for:

K. Okada and K. Kasai, "A Two-Branch Finite-Field Construction for Regular CSS LDPC Bases," arXiv:2605.23894, 2026.

Files:

- `p64_lift_summary.json`: machine-readable summary of the F16 `(3,10)` base and the 64-fold CPM lift reported in the paper.
- `p64_lift_coefficients.html`: full table of the 960 CPM lift coefficients for the `[[10240,4108,10<=d<=32]]` code.
- `p64_lift_coefficients.csv`: CSV version of the lift coefficients, with columns `side,base_row,base_col,shift_mod_64`.
- `p64_lift_coefficients.json`: JSON version of the lift coefficients with metadata and the indexing convention.
- `FER_P64_depolarizing_range.pdf`: FER figure for the constructed 64-fold lift.

The detailed finite-length instance is the 64-fold lift of the F16 `(3,10)` base:

- base: `[[160,76,4]]`
- lifted code: `[[10240,4108,10<=d<=32]]`
- row weight: 10
- column weight: 3
- rank(HX) = rank(HZ) = 3066
- post-processing FER at depolarizing probability `p=0.058`: `1.0e-7`

Lift coefficient convention:

For a base edge `(base_row, base_col)` on side `HX` or `HZ` with coefficient `s=shift_mod_64`,
the lifted row `base_row*64 + r` has a nonzero entry in column
`base_col*64 + ((r+s) mod 64)`, for `r=0,...,63`.