Related Experiment Video
Updated: Aug 17, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
High-Quality Ferromagnetic Josephson Junctions Based on Aluminum Electrodes.
Antonio Vettoliere1, Roberta Satariano2, Raffaella Ferraiuolo2,3
1Consiglio Nazionale delle Ricerche-ISASI, Via Campi Flegrei 34, I-80078 Pozzuoli, Italy.
Researchers developed high-quality ferromagnetic Josephson junctions using aluminum technology. This breakthrough supports advanced quantum circuits and novel applications like cryogenic memories and single-photon detectors.
Area of Science:
- Condensed Matter Physics
- Quantum Computing
- Materials Science
Background:
- Aluminum Josephson junctions are fundamental for superconducting quantum bits.
- Hybrid ferromagnetic Josephson junctions offer tunable magnetic states for advanced applications.
- Existing fabrication methods limit the quality of aluminum-based ferromagnetic Josephson junctions.
Purpose of the Study:
- To report the fabrication and characterization of high-quality ferromagnetic Josephson junctions using aluminum.
- To demonstrate an innovative fabrication process for improved hybrid aluminum Josephson junctions.
- To present the DC transport properties of these junctions at low temperatures.
Main Methods:
- Utilized an innovative fabrication process inspired by niobium-based technology.
- Fabricated high-quality hybrid ferromagnetic Josephson junctions based on aluminum.
- Characterized the junctions' DC transport properties, including current-voltage characteristics and critical current dependence on temperature and magnetic field.
Main Results:
- Achieved very high-quality hybrid aluminum Josephson junctions.
- Demonstrated the feasibility of using ferromagnetic Josephson junctions in advanced quantum circuits.
- Detailed the fabrication process and presented key low-temperature DC transport properties.
Conclusions:
- The developed fabrication process enables high-quality ferromagnetic Josephson junctions using aluminum technology.
- These junctions are suitable for advanced quantum circuits and applications in cryogenic memory and spintronics.
- The findings pave the way for further integration of ferromagnetic Josephson junctions in quantum technologies.
Related Concept Videos
Biasing of Metal-Semiconductor Junctions
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Metal-Semiconductor Junctions
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Ferromagnetism
Biasing of FET
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
Theory of Metallic Conduction
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
MOSFET: Enhancement Mode
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...

