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We have found experimentally that the noise of ballistic electron transportin a superconductor/semiconductor/superconductor junction is enhanced relativeto the value given by the general relation, S_V=2eIR^2coth(eV/2kT), for twovoltage regions in which this expression reduces to its thermal and shot noiselimits. The noise enhancement is explained by the presence of large chargequanta, with effective charge q*=(1+2Delta/eV)e, that generate a noise spectrumS_V=2q*IR^2, as predicted in Phys. Rev. Lett. 76, 3814 (1996). These chargequanta result from multiple Andreev reflections at each junction interface,which are also responsible for the subharmonic gap structure observed in thevoltage dependence of the junction's conductance.Comment: 5 pages, 5 figures, submitted to Physical Review B as a Rapid  Communication. v2 author name in reference corrected. v3 added references. v4  clarifications in the text and reference added thanks to C. Urbin

Shot noise of large charge quanta in superconductor/semiconductor/superconductor junctions