The goal of QATACOMB is to develop a miniaturized solid-state platform for generation, detection and complete characterization of non-classical squeezed states of THz frequency light. This will exploit THz quantum cascade laser (QCL) frequency combs (FCs) as nonlinear sources, coupled with graphene nanoscale quantum sensors and cavity-coupled ultrafast coherent detectors. The successful achievement of the project goals will be disruptive, assessing fundamental knowledge in the strategic fields of THz photonics and QT.