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Circuit Quantum Electrodynamics with Carbon-Nanotube-Based Superconducting Quantum Circuits

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  • M. Mergenthaler
  • A. Nersisyan
  • A. Patterson
  • M. Esposito
  • A. Baumgartner
  • C. Schönenberger
  • G.A.D. Briggs
  • E.A. Laird
  • P.J. Leek
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Article number064050
<mark>Journal publication date</mark>30/06/2021
<mark>Journal</mark>Physical Review Applied
Issue number6
Volume15
Number of pages8
Publication StatusPublished
Early online date21/06/21
<mark>Original language</mark>English

Abstract

Hybrid circuit QED involves the study of coherent quantum physics in solid-state systems via their interactions with superconducting microwave circuits. Here we present a crucial step in the implementation of a hybrid superconducting qubit that employs a carbon nanotube as a Josephson junction. We realize the junction by contacting a carbon nanotube with a superconducting Pd/Al bilayer, and implement voltage tunability of the quantum circuit's frequency using a local electrostatic gate. We demonstrate a strong dispersive coupling to a coplanar waveguide resonator by investigating the gate-tunable resonator frequency. We extract qubit parameters from spectroscopy using dispersive readout and find qubit relaxation and coherence times in the range of 10-200ns.

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© 2021 American Physical Society