Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 10: Quantum Information (Concepts and Methods) II
Q 10.2: Talk
Monday, March 14, 2022, 16:45–17:00, Q-H12
Bohmian Trajectories in a Double Slit Experiment — •Carlotta Versmold1,2,3, Jan Diewior1,2,3, Lukas Knips1,2,3, Florian Huber1,2,3, Jasmin Meinecke1,2,3, and Harald Weinfurter1,2,3 — 1Department für Physik, Ludwig-Maximilians-Universität, Munich, Germany — 2Max-Planck-Institut für Quantenoptik, Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), Munich, Germany
Bohmian mechanics (BM) is one of many alternative interpretations of quantum mechanics (QM). Attributing a definite position to particles at all times it allows the introduction of particle trajectories, which are forbidden in standard QM. Necessary for this is the introduction of nonlocal effects into the theory, which can cause instantaneous reordering of trajectories. In order to investigate this non-locality one photon of an entangled photon pair is sent through a double slit apparatus where its average Bohmian trajectory is observed via weak measurement. Employing the entanglement in the photon's polarization degree of freedom enables to analyze different cases of which-way-information as the evolution of the interfering photon depends on the observation of the second photon. By varying the point in time of the polarization-measurement of the second photon, delayed choice measurements of the corresponding trajectories can be performed.
Average trajectories have already been measured in experiments and are shown to correspond with those calculated in BM. Nevertheless, the meaning of average trajectories and BM is much discussed. This experiment will contribute to a better understanding of the theory.