Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-11-05
Annalen der Physik 16, 10-11 (2007) 736-750
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1002/andp.200710263
Non-Gaussian fluctuations of the electrical current can be detected with a Josephson junction placed on-chip with the noise source. We present preliminary measurements with an NIS junction as a noise source, and a Josephson junction in the thermal escape regime as a noise detector. It is shown that the Josephson junction detects not only the average noise, which manifests itself as an increased effective temperature, but also the noise asymmetry. A theoretical description of the thermal escape of a Josephson junction in presence of noise with a non-zero third cumulant is presented, together with numerical simulations when the noise source is a tunnel junction with Poisson noise. Comparison between experiment and theory is discussed.
Ankerhold Joachim
Birge Norman O.
Esteve Daniel
Huard Benjamin
Pothier H.
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