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

Mergenthaler, Matthias and Nersisyan, Ani and Patterson, Andrew and Esposito, Martina and Baumgartner, Andreas and Schönenberger, Christian and Briggs, G. Andrew D. and Laird, Edward A. and Leek, Peter J.. (2021) Circuit Quantum Electrodynamics with Carbon-Nanotube-Based Superconducting Quantum Circuits. Physical Review Applied, 15 (6). 064050.

Full text not available from this repository.

Official URL: https://edoc.unibas.ch/86343/

Hybrid circuit quantum electrodynamics (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 realise the junction by contacting a carbon nanotube with a superconducting Pd/Al bi-layer, and implement voltage tunability of the quantum circuitâEurotms frequency using a local electrostatic gate. We demonstrate strong dispersive coupling to a coplanar waveguide resonator via observation of a resonator frequency shift dependent on applied gate voltage. We extract qubit parameters from spectroscopy using dispersive readout and find qubit relaxation and coherence times in the range of $10-200~rmns$.