Based on the effect of a shot-noise suppression in mesoscopic circuits
comprising several single-particle sources we propose and analyze a
method to compare states of emitted electrons. We analyze both a
regularly emitting source and a stochastic source of electrons and
holes. In addition the multi-particle source (a double-cavity quantum
capacitor) and the commonly used metallic contact, as an electron
source, with either constant, periodic in time, or carefully shaped
Lorentzian-pulse voltage, are analyzed as well. We show that collision
of wave packets of a close shape at the QPC leads to suppression of a
current cross-correlator for all considered types of sources. This
suppression effect takes place even if the incoming flows are noisy
and/or if the wave-packets carry different number of particles. The
noise suppression results from fermionic (due the Pauli principle)
positive correlations arising between colliding particles.
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