Abstract
The mechanism of multiple Andreev reflections (MAR) leads to a rather complex behavior of the noise spectral density in superconducting quantum point contacts as function of the relevant parameters. In this contribution we analyze recent theoretical and experimental efforts which have permitted to clarify this issue to a great extent. The theoretical description of noise in the coherent MAR regime will be summarized, discussing its main predictions for equilibrium and non-equilibrium current fluctuations. We then analyze noise measurements in well characterized superconducting atomic contacts. These systems allow for a direct test of the theoretical predictions without fitting parameters. In particular, the increase of the effective charge corresponding to the openning of higher order Andreev channels has been verified.
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Martín-Rodero, A. et al. (2003). Quantum Noise and Mutiple Andreev Reflections in Superconducting Contacts. In: Nazarov, Y.V. (eds) Quantum Noise in Mesoscopic Physics. NATO Science Series, vol 97. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0089-5_3
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DOI: https://doi.org/10.1007/978-94-010-0089-5_3
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