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Clean carbon nanotubes coupled to superconducting impedance-matching circuits.


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Authors

Ranjan, V 
Puebla-Hellmann, G 
Jung, M 
Hasler, T 
Nunnenkamp, Andreas  ORCID logo  https://orcid.org/0000-0003-2390-7636

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.

Description

Keywords

cond-mat.mes-hall, cond-mat.mes-hall

Journal Title

Nat Commun

Conference Name

Journal ISSN

2041-1723
2041-1723

Volume Title

Publisher

Springer Science and Business Media LLC
Sponsorship
We acknowledge financial support by the ERC project QUEST, the EC project SE2ND, the NCCR QSIT and the Swiss National Science Foundation.