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Showing posts from December, 2019

Prepare and move two entangled particles

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In this blog we are presenting and supporting a local and realist model for quantum mechanics , based on simple rules of (stochastic) motion on a discrete spatiotemporal lattice. The model is realist in the sense that at each instant particles have definite properties such as position, momentum, energy, etc. and these are independent of any possible measurement. Locality means that particles interact only with other beables that are resident in the lattice nodes actually visited. In particular, quantum behavior is reproduced for an ensemble of similarly-prepared particles and thanks to a footprint mechanism where particles leave some information in the node they visit which influece the behavior of subsequent particles. One of the most common objections to the fact that one even tries to build a local and realist model, is that these models are simply impossible, as they are supposedly ruled out by Bell 's theorem . In this post and in future ones we shall demonstrate that the op...

A test of Wheeler. Local-realistic explanation of interferometry

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(Cover image from: A.G. Manning, R.I. Khakimov, R.G. Dall, and A.G. Truscott, "Wheeler’s delayed-choice gedanken experiment with a single atom", Nature Physics, vol. 11, July 2015, DOI: 10.1038/NPHYS3343) In previous posts, we have discussed several quantum mechanics scenarios (for example here , here , here , etc.) and seen how they are perfectly reproduced by our local-realistic model , both theoretically and numerically. In this post we shall describe a further test for our model, that is reproducing the non-classical behavior of interferometers. We shall consider in particular  atom interferometers , and leave those operating with photons to when we shall treat quantum electrodynamics. A rather general interferometer scheme, shown in the figure below, consists of: (i) a source S where a beam in a particular state is prepared, (b) a first splitting of the beam into two paths, BS1, with different momentum states and phases (iii) a recombination M of the two paths (...