Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 8: Quantum Information (Concepts and Methods) II
Q 8.2: Talk
Monday, March 9, 2020, 14:15–14:30, e001
Bohmian trajectories in a double slit - delayed choice analysis with entangled photons — •Jan Dziewior1,2,3, Lukas Knips1,2,3, Jasmin D. A. Meinecke1,2,3, Maria Galli4, and Harald Weinfurter1,2,3 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, Munich, Germany — 2Max-Planck-Institut für Quantenoptik, Garching, Germany — 3MCQST, Munich, Germany — 4Institut für Experimentalphysik, Innsbruck, Austria
Bohmian mechanics, a realistic interpretation of quantum mechanics, ascribes reality to the positions and momenta of quantum particles at the cost of a non-local ontology. Thus, contrary to standard quantum mechanics it allows to conceive of definite particle trajectories, while being fully compatible with the standard theory in all empirical predictions. Nevertheless, the plausibility of the Bohmian picture has been frequently put into question, most prominently with a Gedankenexperiment by Englert et al.
Here, the experimental realization of this Gedankenexperiment is presented. The conditions for the occurrence of so called “surrealistic” trajectories are realized by using a pair of entangled photons, where one of the photons is sent into an optical double slit. The average trajectories are recorded using a method inspired by the weak measurement concept. By detecting the second photon before or after the first photon passed the double slit, or even after the first photon was detected, it is possible to realize a series of delayed choice scenarios, exposing the differences in the conclusions of standard and Bohmian quantum mechanics.