Strongly supported as a FOM Concentration group a concentrated and fully integrated effort on quantum information processing is established at Delft and Leiden. The ambition is to develop techniques and theory and to execute experiments on quantum information processing using semiconducting quantum dots, superconducting circuits, and optics. It is a challenging engineering goal with many practical and theoretical questions, all strongly related to quantum informatics. Several approaches are studied simultaneously using single-photon-detection, superconducting devices, GaAs quantumdots, as well as semiconducting nanowires and spindependent defects in diamond. In addition apart from quantum-technology experiments fundamental aspects of quantum mechanics are tested.