Impedance and noise measurements of clean CNT quantum dots using GHz superconducting matching circuits
V. Ranjan1, T. Hasler1, M. Jung1, G. Puebla-Hellmann1, M. Muoth1, C. Hierold3, A. Wallraff2 and C. Schonenberger1
1Department of Physics, University of Basel, Switzerland
2Department of Physics, ETH Zurich, Switzerland
3Department of Mechanical and Process Engineering, ETH Zurich, Switzerland
A device that unites a low-disorder carbon nanotube with a low-loss microwave resonator has so far remained a challenge, due to fabrication in-compatibility of one with the other. Employing stamping techniques, we couple nanotubes to gigahertz superconducting matching circuits and thereby retain pristine transport characteristics such as the control over formation of, and coupling strengths between, the quantum dots. Matching capabilities more importantly enables quantitative parameter extraction of condutance, susceptance and electronic shot noise at 3 GHz with improved signal to noise ratio.