title: Clean carbon nanotubes coupled to superconducting impedance-matching circuits.
abstract: Coupling carbon nanotube devices to microwave circuits offers a significant increase in bandwidth (BW) and signal-to-noise ratio. These facilitate fast non-invasive readouts important for quantum information processing, shot noise and correlation measurements. However, creation of a device that unites a low-disorder nanotube with a low-loss microwave resonator has so far remained a challenge, due to fabrication incompatibility of one with the other. Employing a mechanical transfer method, we successfully couple a nanotube to a gigahertz superconducting matching circuit and thereby retain pristine transport characteristics such as the control over formation of, and coupling strengths between, the quantum dots. Resonance response to changes in conductance and susceptance further enables quantitative parameter extraction. The achieved near matching is a step forward promising high-BW noise correlation measurements on high impedance devices such as quantum dot circuits.
authors.affiliation: Department of Physics, University of Basel, Klingelbergstrasse 82, Basel 4056, Switzerland.
authors.forename: V
authors.initials: V
authors.lastname: Ranjan
authors.affiliation: 1] Department of Physics, University of Basel, Klingelbergstrasse 82, Basel 4056, Switzerland [2] Department of Physics, ETH Zurich, Otto-Stern-Weg 1, Zurich 8093, Switzerland.
authors.forename: G
authors.initials: G
authors.lastname: Puebla-Hellmann
authors.affiliation: Department of Physics, University of Basel, Klingelbergstrasse 82, Basel 4056, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Jung
authors.affiliation: Department of Physics, University of Basel, Klingelbergstrasse 82, Basel 4056, Switzerland.
authors.forename: T
authors.initials: T
authors.lastname: Hasler
authors.affiliation: Department of Physics, University of Basel, Klingelbergstrasse 82, Basel 4056, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Nunnenkamp
authors.affiliation: Department of Mechanical and Process Engineering, ETH Zurich, Tannenstrasse 3, Zurich 8093, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Muoth
authors.affiliation: Department of Mechanical and Process Engineering, ETH Zurich, Tannenstrasse 3, Zurich 8093, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Hierold
authors.affiliation: Department of Physics, ETH Zurich, Otto-Stern-Weg 1, Zurich 8093, Switzerland.
authors.forename: A
authors.identifier: 0000000234764485
authors.initials: A
authors.lastname: Wallraff
authors.affiliation: Department of Physics, University of Basel, Klingelbergstrasse 82, Basel 4056, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Schönenberger