Abstract
As shown in the EPR paper (Einstein, Podolsky e Rosen, 1935), Quantum Mechanics is a non-local Theory. The Bell theorem and the successive experiments ruled out the possibility of explaining quantum correlations using only local hidden variables models. Some authors suggested that quantum correlations could be due to superluminal communications that propagate isotropically with velocity vt > c in a preferred reference frame. For finite values of vt and in some special cases, Quantum Mechanics and superluminal models lead to different predictions. So far, no deviations from the predictions of Quantum Mechanics have been detected and only lower bounds for the superluminal velocities vt have been established. Here we describe a new experiment that increases the maximum detectable superluminal velocities and we give some preliminary results.
Highlights
The non local character of Quantum Mechanics (QM ) has been object of a great debate starting from the famous Einstein-Podolsky-Rosen (EPR) paper [1]
In the present paper we have developed an accurate and stable method to equalize the optical paths of the entangled photons over a kilometric distance
Due to vertical gradients of the air refractive index in the European Gravitational Observatory (EGO) gallery induced by sunlight it has been needed to greatly modify the experimental apparatus proposed in[27] introducing a complex feedback procedure to correct the deviations of the beams and the astigmatism of the images
Summary
The non local character of Quantum Mechanics (QM ) has been object of a great debate starting from the famous Einstein-Podolsky-Rosen (EPR) paper [1]. For instance, a quantum system made by two photons a and b that are in the polarization entangled state. Where H and V stand for horizontal and vertical polarization, respectively, and φ is a constant phase coefficient. The two entangled photons are created at point O, propagate in space far away one from the other (see Fig.1) and reach at the same time points A (Alice) and B (Bob) that are equidistant from O as schematically drawn in Fig.. Two polarizing filters PA and PB lie at points A and B, respectively.
Sign-in/Register to view highlights & summary 
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call