QTI is developing quantum-enhanced radio-frequency sensing techniques for the search for axion dark matter and axion-like particles. The QTI Axion Detector Demonstrator (QTI ADD) explores heterodyne detection concepts based on multimode RF cavities operating in cryogenic environments.

The approach consists of driving one cavity mode while monitoring a second mode for axion-induced photon conversion signals. Current activities include: development of low-noise RF readout systems, multimode cavity design and optimisation, cryogenic infrastructure deployment and sub-Kelvin operation for quantum-limited measurements viability.

A dedicated laboratory and cryogenic installation are being established at CERN, including helium infrastructure and a sub-Kelvin cryogenic system for future detector demonstrators. These activities aim to establish the technological foundations for future heterodyne axion experiments exploiting quantum-enhanced sensing techniques.