Quantum technologies promise to revolutionize the way we acquire, manipulate, and communicate information. Photons are key players in quantum technologies with a transversal role in all applications. Integrated photonics is the only viable approach to scale up quantum photonics to the level of real-world applications. In this context, the ERC Proof of Concept PhotonFAB aims at the commercial exploitation in the globally expanding market of quantum technologies of the integrated photonic devices developed in the main ERC Advanced Grant project CAPABLE. These devices are characterized by a unique microfabrication technology based on direct writing with femtosecond lasers, providing high versatility and unique 3D layout capabilities.