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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Carbon nanotube superconducting quantum interference device.

J-P Cleuziou¹, W Wernsdorfer, V Bouchiat

¹Centre d'Elaboration des Matériaux et d'Etudes Structurales, CEMES-CNRS, 29 rue Jeanne Marvig, 31055 Toulouse Cedex 4, France.

Nature Nanotechnology

|July 26, 2008

Summary

This summary is machine-generated.

This study presents a superconducting quantum interference device (SQUID) using carbon nanotube (CNT) Josephson junctions. These CNT-SQUIDs act as sensitive magnetometers, enabling the study of individual magnetic particle magnetization reversal.

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Area of Science:

Quantum physics
Condensed matter physics
Nanotechnology

Background:

Superconducting quantum interference devices (SQUIDs) are sensitive magnetic field detectors.
Carbon nanotubes (CNTs) offer unique electronic properties for quantum devices.

Purpose of the Study:

To develop a SQUID utilizing single-walled carbon nanotube (CNT) Josephson junctions.
To investigate the gate-tunable properties of CNT Josephson junctions and their application in SQUIDs.

Main Methods:

Fabrication of a SQUID with CNT Josephson junctions.
Utilizing electrostatic gates to control quantum dot (QD) energy levels and barrier transparency.
Tuning quantum phase interference of Cooper pairs with gate electrodes.

Main Results:

Quantum confinement in CNT junctions creates discrete QD energy levels.
Gate control allows tuning of QD states hybridization and SQUID phase interference.
Demonstrated gate-controlled pi-junction behavior in CNT junctions.
Achieved optimal modulation of switching current with magnetic flux.

Conclusions:

CNT Josephson junctions can be tuned to act as gate-controlled pi-junctions.
The developed CNT-SQUIDs are highly sensitive local magnetometers.
These devices show promise for studying magnetization reversal in single magnetic entities.