Transversal gates for quantum CSS codes

arXiv:2601.21514v2 Announce Type: replace-cross Abstract: In this paper, we focus on the problem of computing the set of diagonal transversal gates fixing a CSS code. We determine the logical actions of these gates and characterize the subgroups that induce tensor products of single-qubit logical gates and logical identities. We describe these groups through explicit linear equations given by componentwise products of basis vectors of the underlying classical codes, which is the key difference from previous approaches. We compute the complete set of diagonal transversal gates fixing the code, and of transversal logical gates, for any CSS code arising from monomial codes, a family that includes decreasing monomial codes and polar codes. As a consequence, we recover and extend some results in the literature on CSS-T codes, triorthogonal codes, and divisible codes. We also extend these results to diagonal gates acting transversally on several code blocks and use them to characterize addressable gates.