Détection « on-chip » des fluctuations quantiques de courant de nano-systèmes – DOC-FLUC

Our project is to develop and exploit the capabilities of on-chip noise detectors to investigate electronic transport in mesoscopic conductors. On-chip detectors allow a well-controlled and optimal coupling to noise sources, giving access to high-frequency noise and to high moments of noise (at least the third one). Conversely, the intimate coupling between detector and source gives rise to back-action, which needs to be modelled and accounted for. The project develops along several directions: - development of on-chip detectors for high-frequency noise and for high moments of noise, both based on Josephson junctions - measurement of quantum fluctuations in quantum dots with Kondo effect, using both quantum dots in semiconductors and carbon nanotubes - measurement of quantum fluctuations of current in carbon nanotubes - investigation of transport in weak links between superconductors, using atomic contacts, in the regime of multiple Andreev reflection - experimental and theoretical study of the interactions between quantum conductors in an electrical circuit