  We investigate the visibility of the current and shot-noise correlations of
electrical analogs of the optical Mach-Zehnder interferometer and the Hanbury
Brown Twiss interferometer. The electrical analogs are discussed in conductors
subject to high magnetic fields where electron motion is along edge states. The
transport quantities are modulated with the help of an Aharonov-Bohm flux. We
discuss the conductance (current) visibility and shot noise visibility as a
function of temperature and applied voltage. Dephasing is introduced with the
help of fictitious voltage probes. Comparison of these two interferometers is
of interest since the Mach-Zehnder interferometer is an amplitude
(single-particle) interferometer whereas the Hanbury Brown Twiss interferometer
is an intensity (two-particle) interferometer. A direct comparison is only
possible for the shot noise of the two interferometers. We find that the
visibility of shot noise correlations of the Hanbury Brown Twiss interferometer
as function of temperature, voltage or dephasing, is qualitatively similar to
the visibility of the first harmonic of the shot noise correlation of the
Mach-Zehnder interferometer. In contrast, the second harmonic of the shot noise
visibility of the Mach-Zehnder interferometer decreases much more rapidly with
increasing temperature, voltage or dephasing rate.
