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Asymmetric noise probed with a josephson junction.

Q Le Masne¹, H Pothier, Norman O Birge

¹Quantronics group, Service de Physique de l'Etat Condensé (CNRS URA 2464), CEA-Saclay, 91191 Gif-sur-Yvette, France.

Physical Review Letters

|March 5, 2009

Summary

This summary is machine-generated.

Noise fluctuations in tunnel junctions were measured using Josephson junctions. Noise variance elevated effective temperature, while its asymmetry altered switching rates, matching theoretical predictions.

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Area of Science:

Quantum electronics
Mesoscopic physics

Background:

Tunnel junctions exhibit current fluctuations.
Josephson junctions are sensitive to current bias and noise.

Purpose of the Study:

To measure current fluctuations in a tunnel junction using a Josephson junction.
To investigate the impact of noise on Josephson junction switching dynamics.
To compare experimental results with theoretical predictions.

Main Methods:

Utilizing a Josephson junction as a sensitive detector.
Operating in a regime of thermally activated switching.
Analyzing the effects of current noise variance and its third cumulant.

Main Results:

Current noise variance elevated the effective temperature of the Josephson junction.
The asymmetric nature of the noise (third cumulant) caused different switching rates for positive and negative current biases.
Experimental measurements quantitatively aligned with recent theoretical models.

Conclusions:

The study provides experimental validation for theoretical predictions regarding noise effects in Josephson junctions.
Understanding noise-induced switching dynamics is crucial for quantum electronic devices.