Experimental nonlocal and surreal Bohmian trajectories

Sci Adv. 2016 Feb 19;2(2):e1501466. doi: 10.1126/science.1501466. eCollection 2016 Feb.

Abstract

Weak measurement allows one to empirically determine a set of average trajectories for an ensemble of quantum particles. However, when two particles are entangled, the trajectories of the first particle can depend nonlocally on the position of the second particle. Moreover, the theory describing these trajectories, called Bohmian mechanics, predicts trajectories that were at first deemed "surreal" when the second particle is used to probe the position of the first particle. We entangle two photons and determine a set of Bohmian trajectories for one of them using weak measurements and postselection. We show that the trajectories seem surreal only if one ignores their manifest nonlocality.

Keywords: Bohmian mechanics; interpretations of quantum mechanics; quantum measurement; weak measurement.

Publication types

  • Research Support, Non-U.S. Gov't