Moderate-length lifted quantum Tanner codes

We introduce new families of quantum Tanner codes, a class of quantum codes which first appeared in the work of Leverrier and Z\'emor. These codes are built from two classical Tanner codes, for which the underlying graphs are extracted from coverings of 2D geometrical complexes, and the local linear codes are tensor-product of cyclic or double-circulant linear codes. We present several explicit families, and identify instances of moderate length quantum codes which are degenerate, have low check weight, and for which the distance surpasses the square root of the code length. Among them, we report the existence of a $[[96,2,12]]$ code, for which half of the checks are of weight 8 and the other half of weight 4.