Circuit quantum electrodynamics with carbon-nanotube-based superconducting quantum circuits

Journal article

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.

Authors: Mergenthaler, M; Nersisyan, A; Patterson, A; Esposito, M; Baumgartner, A

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Physical Society
• Journal: Physical Review Applied
• Volume: 15
• Issue: 6
• Article number: 64050
• Publication date: 2021-06-21
• Acceptance date: 2021-05-21
• DOI: 10.1103/PhysRevApplied.15.064050
• EISSN: 2331-7019
• Language: English
• Keywords: FFR