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Reconfigurable error-correcting codes beyond the Hadamard code

Identify error-correcting codes enc that are (δ, μ)-reconfigurable in the sense that, for any distinct messages α and β, there exists a reconfiguration sequence from enc(α) to enc(β) such that every intermediate function is δ-close to either enc(α) or enc(β) and (δ+μ)-far from enc(γ) for all γ distinct from α and β.

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Background

The paper proves a reconfigurability property for Hadamard codes and leverages it to achieve robustization in the alphabet-reduction step for Maxmin Binary CSP Reconfiguration.

The authors ask whether similar reconfigurability properties exist for other error-correcting codes, formalizing a notion of (δ, μ)-reconfigurability that would generalize their technique beyond the Hadamard code.

References

We leave some open questions: (Question 3) Given the reconfigurability of Hadamard codes (\cref{lem:Hadmard-reconf}), it is natural to ask that of other error-correcting codes: One may say that an error-correcting code \enc is $(\delta,\mu)$-reconfigurable if for any ${\alpha} \neq {\beta}$, there exists a reconfiguration sequence from $\enc({\alpha})$ to $\enc({\beta})$ such that every function in it is $\delta$-close to either $\enc({\alpha})$ or $\enc({\beta})$, and $\left(\delta+\mu\right)$-far from $\enc({\gamma})$ for every ${\gamma} \neq {\alpha},{\beta}$. Is there any such reconfigurable error-correcting code?

Alphabet Reduction for Reconfiguration Problems (2402.10627 - Ohsaka, 16 Feb 2024) in Section 6 (Conclusions)