Лабораторија за нанофотонику и Секција за фотонику Друштва физичких хемичара Србије организују заједнички догађај у оквиру семинара Центра за фотонику Института за физику у Београду у четвртак, 9. априла 2026. године у 15 часова у читаоници библиотеке „Др Драган Поповић“. Др Мохамед Хатифи (Институт Фреснел и Centrale Méditerranée, Aix-Marseille University, Француска) одржаће предавање:
Where Does the Quantum Particle Go? Quantum Paths and Probability Flow
САЖЕТАК:
Quantum theory has changed how we interpret what was commonly called ”physical reality”. In the Copenhagen interpretation of quantum mechanics, properties of a quantum system, such as position, are not assigned definite values before measurement. In 1927, during the Solvay conference, Louis de Broglie proposed an alternative response to this tension. He aimed to restore determinism and realism, and to bring the notion of trajectory back to the foreground. David Bohm later rediscovered and extended this idea, leading to the pilot-wave formulation of quantum mechanics, famously praised by John Bell as a
striking way to rewrite quantum dynamics in deterministic terms. The talk then develops a unifying ”probability-flow” viewpoint in which quantum dynamics is organized around a probability density ρ and an associated current J linked by a continuity equation. Trajectories arise as the natural flow lines of this current, or in stochastic variants as paths generated by drift and diffusion that reproduce the same
continuity structure. In this language, the Born rule ρ = |ψ|2 is not treated as an external measurement axiom, but as a distinguished equilibrium distribution that is transported consistently by the
trajectory dynamics, meaning that it is preserved in time. The conceptual status of quantum equilibrium is discussed in terms of typicality arguments and dynamical relaxation mechanisms. The same
construction carries over across markedly different regimes: nonrelativistic matter waves governed by the Schro ̈dinger equation; relativistic spin-1/2 dynamics governed by the Dirac equation; diffusion-based trajectory theories in the spirit of Nelson; and wave or field settings where, in suitable field descriptions, energy-flow lines provide a path-like account for photons.