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

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Published on: August 2, 2019

The diamond superconducting quantum interference device.

Soumen Mandal¹, Tobias Bautze, Oliver A Williams

¹Institut Néel, CNRS and Université Joseph Fourier, 38042 Grenoble, France. soumen.mandal@gmail.com

|August 2, 2011

Summary

Superconducting diamond films enable micrometer-scale quantum interference devices (μ-SQUIDs) that operate in high magnetic fields up to 4 Tesla. This breakthrough advances the detection of quantum motion in diamond-based nanomechanical systems.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Technologies

Background:

Diamond is typically an electrical insulator.
Boron doping above a critical concentration (∼0.25 atom %) induces superconductivity in diamond at low temperatures.
Superconducting devices offer unique properties for sensitive measurements.

Purpose of the Study:

To realize a micrometer-scale superconducting quantum interference device (μ-SQUID) using boron-doped diamond (BDD) films.
To investigate the operational capabilities of BDD μ-SQUIDs in high magnetic fields.
To assess the potential for diamond-based superconducting devices in quantum motion detection.

Main Methods:

Fabrication of nanocrystalline boron-doped diamond (BDD) films.
Integration of BDD films into a micrometer-scale superconducting quantum interference device (μ-SQUID) architecture.
Testing of μ-SQUID performance in varying magnetic field strengths and directions.

Main Results:

Successful realization of a μ-SQUID constructed from superconducting BDD films.
Demonstration of stable μ-SQUID operation in magnetic fields up to 4 Tesla.
Confirmation of field direction-independent operation of the BDD μ-SQUID.

Conclusions:

Superconducting diamond is a viable material for fabricating high-performance μ-SQUIDs.
BDD μ-SQUIDs exhibit robust operation in strong magnetic fields, crucial for sensitive applications.
This work represents a significant advancement towards detecting quantum motion using diamond-based nanomechanical oscillators.