  We investigate nonequilibrium noise in a diffusive Andreev interferometer, in
which currents emerging from two Normal metal/Superconductor (N-S) interfaces
can interfere. We observe a modulation of the shot noise when the phase
difference between the two N-S interfaces is varied by a magnetic flux. This is
the signature of phase-sensitive fluctuations in the normal metal. The
effective charge inferred from the shot noise measurement is close to q_eff=2e
but shows phase-dependent deviations from 2e at finite energy, which we
interprete as due to pair correlations. Experimental data are in good agreement
with theoretical predictions based on an extended Keldysh Green's function
approach.

Mesoscale and Nanoscale Physics