Supercurrent noise in quantum point contacts

Details Supercurrent noise in quantum point contacts Supercurrent noise in quantum point contacts

1995-11-27

arxiv.org/abs/cond-mat/9511128v1

Physics

Condensed Matter

12 pages, revtex, 2 figures by fax/conventional mail upon request

Scientific paper

10.1103/PhysRevLett.76.3814

Spectral density of current fluctuations in a short ballistic superconducting quantum point contact is calculated for arbitrary bias voltages $V$. Contrary to a common opinion that the supercurrent flow in Josephson junctions is coherent process with no fluctuations, we find extremely large current noise that is {\em caused} by the supercurrent coherence. An unusual feature of the noise, besides its magnitude, is its voltage dependence: the noise decreases with increasing $V$, despite the fact that the dc current grows steadily with $V$. At finite voltages the noise can be qualitatively understood as the shot noise of the large charge quanta of magnitude $2\Delta /V$ equal to the charge transferred during one period of Josephson oscillations.

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