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Related Experiment Video

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

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Published on: August 2, 2019

Superconductivity-induced macroscopic resonant tunneling.

M C Goorden¹, Ph Jacquod, J Weiss

¹Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland.

Physical Review Letters

|March 21, 2008

Summary

Conductance in pi-biased chaotic Josephson junctions significantly increases at short wavelengths. This enhancement is due to macroscopic resonant tunneling via numerous low-energy Andreev levels.

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Area of Science:

Condensed Matter Physics
Quantum Mechanics
Mesoscopic Physics

Background:

Josephson junctions are fundamental superconducting devices.
Chaotic systems exhibit complex quantum behavior.
Pi-biased junctions introduce unique phase-dependent properties.

Purpose of the Study:

To investigate conductance enhancement in pi-biased chaotic Josephson junctions.
To identify the underlying physical mechanism for this enhancement.
To explore the role of Andreev levels in quantum transport.

Main Methods:

Analytical calculations.
Numerical simulations of quantum transport.
Analysis of Andreev energy level spectrum.

Main Results:

Observed enhancement of conductance by several orders of magnitude.
Identified macroscopic resonant tunneling as the key mechanism.
Demonstrated the role of quasidegenerate, low-energy Andreev levels.

Conclusions:

Pi-biased chaotic Josephson junctions exhibit significant conductance enhancement.
Macroscopic resonant tunneling is crucial for this phenomenon.
The findings offer insights into quantum transport in complex superconducting systems.