Proposal to observe the nonlocality of Bohmian trajectories with entangled photons

Phys Rev Lett. 2013 Feb 8;110(6):060406. doi: 10.1103/PhysRevLett.110.060406. Epub 2013 Feb 7.


Bohmian mechanics reproduces all statistical predictions of quantum mechanics, which ensures that entanglement cannot be used for superluminal signaling. However, individual Bohmian particles can experience superluminal influences. We propose to illustrate this point using a double double-slit setup with path-entangled photons. The Bohmian velocity field for one of the photons can be measured using a recently demonstrated weak-measurement technique. The found velocities strongly depend on the value of a phase shift that is applied to the other photon, potentially at spacelike separation.