Realization of a Carbon-Nanotube-Based Superconducting Qubit

Abstract

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 an 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 bi-layer, and implement voltage tunability of the qubit 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 $10-200\mathrm{ns}$.

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• Gate-Tunable Transmon Using Selective-Area-Grown Superconductor-Semiconductor Hybrid Structures on Silicon
• A gate tunable transmon qubit in planar Ge
• Magnetic-field resilience of 3D transmons with thin-film Al/AlO${}_x$/Al Josephson junctions approaching 1 T
• Gate-tunable kinetic inductance parametric amplifier
• Gate control of superconducting current: Mechanisms, parameters and technological potential
• Effects of surface treatments on flux tunable transmon qubits
• Gatemon qubit on a germanium quantum-well heterostructure
• Microwave Sensing of Andreev Bound States in a Gate-Defined Superconducting Quantum Point Contact
• The carbon nanotube gatemon qubit
• Gate-Compatible Circuit Quantum Electrodynamics in a Three-Dimensional Cavity Architecture
• Nano-assembled open quantum dot nanotube devices
• Josephson junctions based on ultraclean carbon nanotubes
• Quantum Transport Straintronics and Mechanical Aharonov-Bohm Effect in Quasi-metallic SWCNTs
• Integration of graphene-based superconducting quantum circuits in 3D cavity
• Radio-frequency characterization of a supercurrent transistor made from a carbon nanotube