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Novel Nanotube Multiquantum Dot Devices.
R Tormo-Queralt1, C B Møller1, D A Czaplewski2
1ICFO - Institut De Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain.
Nano Letters
|October 26, 2022
Summary
Researchers developed a new fabrication process for carbon nanotube quantum devices. This enables the creation of stable quantum states for advanced quantum information technologies.
Area of Science:
- Condensed matter physics
- Quantum information science
Background:
- Addressable quantum states require systems well-isolated from environmental noise.
- Carbon nanotubes offer a promising platform due to their perfect crystal structure and cylindrical geometry, minimizing surface imperfections.
Purpose of the Study:
- To develop a reliable fabrication process for compact multielectrode circuits compatible with carbon nanotube growth.
- To create a stable, ultraclean environment for quantum dot devices based on carbon nanotubes.
Main Methods:
- Fabrication of compact multielectrode circuits on narrow dielectric ridges to minimize substrate charge fluctuations.
- Suspension of carbon nanotubes over multiple gate electrodes.
- Measurement of charge stability diagrams for double- and triple-quantum dot configurations.
Main Results:
- High-quality double- and triple-quantum dot charge stability diagrams were successfully measured.
- Transport measurements demonstrated long-range single-electron tunneling between quantum dots in a triple-quantum dot system.
Conclusions:
- The developed fabrication process enables the creation of carbon nanotube-based quantum devices in an ultraclean environment.
- This work is foundational for realizing next-generation condensed-matter devices, including spin qubits, mechanical qubits, and quantum simulators.
