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Related Experiment Video

Updated: Jan 19, 2026

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

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

Published on: August 2, 2019

Quantum Hall-based superconducting interference device.

Andrew Seredinski¹, Anne W Draelos¹, Ethan G Arnault¹

¹Department of Physics, Duke University, Durham, NC 27708, USA.

Science Advances

|September 25, 2019

Summary

This summary is machine-generated.

We demonstrate a graphene Josephson junction with efficient side gates. These gates control quantum Hall edge states, enabling localized supercurrents along the junction edges by modulating carrier density.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Electronics

Background:

Josephson junctions are crucial for quantum electronics.
Graphene offers unique electronic properties for novel device applications.
Controlling quantum states in nanoscale devices is a key challenge.

Purpose of the Study:

To investigate supercurrents in graphene Josephson junctions.
To explore the role of side gates in modulating quantum Hall edge states.
To study the behavior of localized supercurrents as a function of magnetic field and carrier density.

Main Methods:

Fabrication of a graphene-based Josephson junction with integrated side gates.
Utilizing side gates to independently modulate carrier density along the junction edges.
Applying magnetic fields to induce quantum Hall edge states.
Measuring supercurrents and conductance.

Main Results:

Highly efficient side gates allow wide-range modulation of carrier density.
Population of the next Landau level was achieved in magnetic fields (1-2 T).
Observation of quantum Hall plateaus with conductance distinct from bulk filling factor.
Demonstration of supercurrents localized along the edges when counter-propagating quantum Hall edge states are introduced.

Conclusions:

Graphene Josephson junctions with side gates provide precise control over quantum edge states.
Localized supercurrents can be generated and studied using this platform.
The findings open avenues for advanced quantum electronic devices.