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arXiv · 2409.00404

Expanding self-orthogonal codes over a ring $\Z_4$ to self-dual codes and unimodular lattices

Minjia Shi·Sihui Tao·Jihoon Hong·Jon-Lark Kim
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Abstract

Self-dual codes have been studied actively because they are connected with mathematical structures including block designs and lattices and have practical applications in quantum error-correcting codes and secret sharing schemes. Nevertheless, there has been less attention to construct self-dual codes from self-orthogonal codes with smaller dimensions. Hence, the main purpose of this paper is to propose a way to expand any self-orthogonal code over a ring $\Z_4$ to many self-dual codes over $\Z_4$. We show that all self-dual codes over $\Z_4$ of lengths $4$ to $8$ can be constructed this way. Furthermore, we have found five new self-dual codes over $\Z_4$ of lengths $27, 28, 29, 33,$ and $34$ with the highest Euclidean weight $12$. Moreover, using Construction $A$ applied to our new Euclidean-optimal self-dual codes over $\Z_4$, we have constructed a new odd extremal unimodular lattice in dimension 34 whose kissing number was not previously known.

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Minjia Shi, Sihui Tao, Jihoon Hong, Jon-Lark Kim. 2024-08-31. Expanding self-orthogonal codes over a ring $\Z_4$ to self-dual codes and unimodular lattices. https://arxiv.org/abs/2409.00404

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