Related Experiment Video
Updated: Jun 12, 2025
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
9.5K
Direct Measurement of a sin(2φ) Current Phase Relation in a Graphene Superconducting Quantum Interference Device.
Simon Messelot1, Nicolas Aparicio1, Elie de Seze1
1University Grenoble Alpes, CNRS, Grenoble INP, <a href="https://ror.org/04dbzz632">Institut Néel</a>, 38000 Grenoble, France.
Physical Review Letters
|September 20, 2024
Summary
Researchers directly measured the current phase relation in graphene Josephson junctions. They demonstrated a novel sin(2φ) Josephson element, crucial for developing decoherence-protected superconducting quantum bits.
Area of Science:
- Condensed Matter Physics
- Quantum Computing
- Materials Science
Background:
- The current phase relation is a key characteristic of Josephson junctions, typically dominated by a sin(φ) harmonic.
- Precise understanding of this relation is vital for designing advanced superconducting quantum circuits.
Purpose of the Study:
- To directly measure the current phase relation in gate-tunable graphene Josephson junctions.
- To investigate the potential of these junctions as alternative Josephson elements.
Main Methods:
- Fabrication of superconducting quantum interference devices (SQUIDs) using graphene Josephson junctions.
- Direct measurement of the current phase relation in these devices.
Main Results:
- Demonstrated that graphene Josephson junctions can exhibit a sin(2φ) current phase relation.
- Showcased a Josephson element free from the conventional sin(φ) harmonic.
Conclusions:
- The novel sin(2φ) Josephson element is a significant advancement for superconducting quantum technologies.
- This finding paves the way for developing superconducting quantum bits with enhanced protection against decoherence.
