To scale up quantum computing systems, it is not sufficient to only build better qubits (the physical ‘heart’ of the quantum computer), but also major innovations in all other parts (control, interface, physical embedding, …) of a quantum computer are required, reaching from efficient thermalization to optimizing classical circuits and components for qubit manipulation and readout. The mere benefit of the holistic approach of ARCTIC is that many of the components and technologies developed here are not only relevant to quantum computing systems but can also be used in other cryogenic applications like space, optical spectroscopy, cold-CMOS high-performance computing, or the improvement of cryogenic systems as such.