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Related Experiment Video

Updated: Jun 21, 2026

Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators

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Published on: August 15, 2014

Rectification in a stochastically driven three-junction SQUID rocking ratchet.

A Sterck¹, D Koelle, R Kleiner

¹Physikalisches Institut and Center for Collective Quantum Phenomena, Universität Tübingen, D-72076 Tübingen, Germany.

Physical Review Letters

|August 8, 2009

Summary

A superconducting quantum interference device (SQUID) acts as a rocking ratchet, rectifying voltages from stochastic currents. Its response vanishes when drive frequencies exceed system scales, aligning with thermodynamic laws.

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Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators

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Published on: August 15, 2014

Scanning SQUID Study of Vortex Manipulation by Local Contact

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Published on: February 1, 2017

Area of Science:

Quantum electronics
Thermodynamics
Superconductivity

Background:

Superconducting quantum interference devices (SQUIDs) exhibit complex dynamics.
Ratchet mechanisms can rectify stochastic fluctuations.
Understanding voltage rectification in Josephson junction systems is crucial.

Purpose of the Study:

To investigate the voltage rectification capabilities of a three-junction SQUID.
To analyze the SQUID's response to stochastic drive currents with a white frequency spectrum.
To explore the influence of cutoff frequency on rectification efficiency.

Main Methods:

Experimental measurements in the adiabatic regime.
Numerical simulations for various cutoff frequencies.
Comparison of experimental and theoretical results.

Main Results:

The three-junction SQUID functions as a rocking ratchet for phase differences.
Experimental results show excellent agreement with theoretical predictions in the adiabatic regime.
Numerical simulations confirm that rectification disappears at high cutoff frequencies, consistent with thermodynamics.

Conclusions:

The three-junction SQUID effectively rectifies voltages under specific stochastic drive conditions.
The system's behavior is well-described by theory, particularly in the adiabatic limit.
Thermodynamic principles govern the disappearance of rectification at high drive frequencies.