Cyclic codes over a commutative non-unitary ring of order 4

Let $I_2$ be the commutative non-unitary ring of order $4$ arising in the classification of Fine.

In this paper, we investigate cyclic codes over $I_2$ through their associated residue and torsion codes over $\mathbb{F}_2$.

We introduce the notions of twisted and untwisted cyclic codes and characterize cyclicity in terms of a compatibility condition involving the twist map and the cyclic shift.

Connections between cyclic codes over $I_2$ and binary quasi-cyclic codes are established via Gray maps.

In particular, we show that the Gray image of a cyclic code over $I_2$ is a binary quasi-cyclic code of index $2$.

We also study duality properties of cyclic codes over $I_2$ and prove that the dual of a cyclic code is again cyclic.

Finally, we classify permutation inequivalent cyclic codes over $I_2$ for lengths $n \le 7$ and determine various structural properties of these codes.