We show that during stochastic beam attenuation in double slit experiments, there appear unexpected new effects for transmission factors below 10^{-4}, which can eventually be observed with the aid of weak measurement techniques. These are denoted as quantum sweeper effects, which are characterized by the bunching together of low counting rate particles within very narrow spatial domains. We employ a „superclassical“ modeling procedure which we have previously shown to produce predictions identical with those of standard quantum theory. Thus it is demonstrated that in reaching down to ever weaker channel intensities, the nonlinear nature of the probability density currents becomes ever more important. We finally show that the resulting unexpected effects nevertheless implicitly also exist in standard quantum mechanics.

Gerhard Groessing, Siegfried Fussy, Johannes Mesa Pascasio, Herbert Schwabl*Extreme beam attenuation in double-slit experiments: Quantum and subquantum scenarios*

Ann. Phys. **353** (2015) 271-281

quant-ph/arXiv:1406.1346