We discuss the superfluid wave function of an atomic Fermi gas, which can be measured in an atom shot noise correlation experiment. We note that it is qualitatively different in the BCS and Bose limits and on the basis of this we propose quantitative criteria to identify the crossover between the two regimes.

arXiv:cond-mat/0505660May 27, 20050 citations

Annals of the New York Academy of Sciences

Qualitative View of Quantum Shot Noise

Rolf W. Landauer

Published Apr 1, 1995• 13 citations

Publisher

DOI: 10.1111/j.1749-6632.1995.tb38984.x

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Spectral density of current fluctuations in a short ballistic superconducting quantum point contact is calculated for arbitrary bias voltages

V

. Contrary to a commonly held view that the supercurrent flow in Josephson junctions is a coherent process without fluctuations, we find extremely large current noise that is caused by the supercurrent coherence. At finite voltages, this noise can be qualitatively understood as the shot noise of the large charge quanta of magnitude $2\ensuremath{\Delta}/V$ equal to the charge transferred through the contact during one period of the Josephson oscillations.