Bremen 2017 – wissenschaftliches Programm

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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 10: Quantum Field Theory II

MP 10.3: Vortrag

Mittwoch, 15. März 2017, 17:45–18:05, SFG 2010

Quantum backflow in scattering situations — •Daniela Cadamuro — TU München, Garching, Deutschland

Measurable quantities that have positive values in classical dynamical systems need not to be positive in quantum theory. For example, consider a free quantum mechanical particle in 1 dimension. There are quantum states in which the particle's velocity is positive with probability 1, but where the probability flux for its position is locally negative; that is, while its velocity points to the right, the particle travels to the left. These effects are however small and limited in space and time by certain lower bounds, which are called "quantum inequalities". Similar effects also appear for a particle whose motion is governed by a Schroedinger equation with a certain class of potentials. The talk will present some recent results and work in progress on this topic.