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Accurate Josephson junction analog.

J H Magerlein¹

¹Bell Laboratories, Murray Hill, NJ 07974, USA.

The Review of Scientific Instruments

|April 1, 1978

Summary

Researchers created a simple electronic analog for Josephson junctions, enabling easier study of their behavior in circuits. This analog accurately models phase and quasiparticle conductance, aiding circuit analysis.

Area of Science:

Electronics
Superconductivity
Quantum Devices

Background:

Josephson junctions are crucial in quantum electronics.
Studying their behavior in complex circuits can be challenging.
Existing models may lack simplicity or accuracy.

Purpose of the Study:

To develop a simple and accurate electronic analog of a Josephson junction.
To facilitate the study of Josephson junction behavior in various circuits.
To model both the superconducting phase and quasiparticle conductance.

Main Methods:

Constructed an electronic analog circuit.
Integrated junction voltage to calculate phase (phi).
Generated a current proportional to sin(phi).

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Incorporated a nonlinear network for quasiparticle conductance.

Main Results:

The electronic analog accurately mimics Josephson junction behavior.
The circuit allows for effective study of junction dynamics.
The model successfully represents phase evolution and conductance.

Conclusions:

The developed electronic analog is a valuable tool for circuit analysis involving Josephson junctions.
This simplified model enhances the accessibility of studying quantum electronic devices.
The analog provides a practical method for understanding complex junction characteristics.