Homecs.ITarXiv:2605.30101

List Recovery for Random Low-Rate Linear Codes

cs.ITmath.IT2026-05v1license

Abstract

We prove a list recovery guarantee for random low-rate linear codes over sufficiently large prime fields. For fixed dimension dd, error fraction α\alpha, and accuracy parameter ε\varepsilon, a random dd-dimensional linear code CFpnC \subseteq \mathbb{F}_p^n is, with high probability, (α,,1+ε1α)(\alpha,\ell,\frac{1+\varepsilon}{1-\alpha}\ell)-list recoverable simultaneously for all input list sizes 2Oα,ε,d(n/logn)\ell\le 2^{O_{\alpha, \varepsilon, d}(n/\log n)}. The proof is inspired by work of Matou\v{s}ek, P\v{r}\'{\i}v\v{e}tiv\'{y}, and \v{S}kovro\v{n} on reconstructing point sets from their projections. It combines a deterministic graph-theoretic certificate, a nonvanishing determinant criterion, and the Schwartz--Zippel lemma. We also give a lower bound showing that any linear code CFpnC \subseteq \mathbb{F}_p^n of dimension at least two cannot be (α,,1+ε1α)(\alpha,\ell,\frac{1+\varepsilon}{1-\alpha}\ell)-list recoverable for feasible list sizes 2Ωα,ε(n)\ell \geq 2^{\Omega_{\alpha, \varepsilon}(n)}. In this sense, our result is nearly optimal.

Cite

@article{arxiv.2605.30101,
  title  = {List Recovery for Random Low-Rate Linear Codes},
  author = {Isaac M Hair and Amit Sahai},
  journal= {arXiv preprint arXiv:2605.30101},
  year   = {2026}
}