Quantum gates from the middle convolution of twisted Burau representations

We study braid representations obtained from character-twisted Burau inputs by the Katz-Long-Moody (KLM) construction, which corresponds to multiplicative middle convolution for KZ-type equations. For $n\ge2$, let $q=e^{2πia}$, $τ=e^{2πic}$, where $a,c>0$ and $nc+(n+1)a<1$. Known form and signature