Equivalence between quantum backflow and classically forbidden probability flow in a diffraction-in-time problem
arXiv:1903.02053 · doi:10.1103/PhysRevA.99.043626
Abstract
Quantum backflow is an interference effect in which a matter-wave packet comprised of only plane waves with non-negative momenta exhibits negative probability flux. Here we show that this effect is mathematically equivalent to the appearance of classically-forbidden probability flux when a matter-wave packet, initially confined to a semi-infinite line, expands in free space.
5 pages, no figures