Condensed matter physics faces the great challenge to explain macroscopic phenomena starting from many particles that are governed by the laws of quantum mechanics. Over the last 30 years, these research efforts have led to the development of superconducting technologies that exploit the quantum coherences in simple circuits. But up to now, few experiments have been able to coherently address condensed matter phenomena. Many of these collective phenomena such as magnons, plasmons or molecular vibrations have a typical energy in the meV range that corresponds to the TeraHertz (THz) frequency range. Alexis Jouan aims to develop superconducting quantum technologies to probe these collective excitations. This will provide decisive tools for accessing the quantum coherences of fundamental excitations such as spin waves in low-dimensional.