Abstract
The wave packet approach to noise in normal-superconductor junctions is generalized to describe normal-superconductor junctions. At equilibrium, the Johnson-Nyquist relation equates the current fluctuations to the conductance arising from Andreev reflection at the interface. For finite biases, a suppression of shot noise similar to that occurring in normal conductors is found, and the noise power has an additional factor 2. Noise correlations in branched circuits are discussed. The anomalous temperature dependence of the mixed thermal-shot noise contributions could possibly be measured experimentally.
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