Measuring non-Gaussian fluctuations through incoherent Cooper pair current

Details Measuring non-Gaussian fluctuations through incoherent Cooper pair current Measuring non-Gaussian fluctuations through incoherent Cooper pair current

2004-12-09

arxiv.org/abs/cond-mat/0412226v1

Phys. Rev. Lett. 93, 247 005 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

We study a Josephson junction (JJ) in the regime of incoherent Cooper pair tunneling, capacitively coupled to a nonequilibrium noise source. The current-voltage (I-V) characteristics of the JJ are sensitive to the excess voltage fluctuations in the source, and can thus be used for wide-band noise detection. Under weak driving, the odd part of the I-V can be related to the second cumulant of noise, whereas the even part is due to the third cumulant. After calibration, one can measure the Fano factors for the noise source, and get information about the frequency dependence of the noise.

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