In search of superluminal quantum communications: recent experiments and possible improvements

[摘要] As shown in the famous EPR paper (Einstein, Podolsky e Rosen, 1935), Quantum Mechanics is non-local. The Bell theorem and the experiments by Aspect and many others, ruled out the possibility of explaining quantum correlations between entangled particles using local hidden variables models (except for implausible combinations of loopholes). Some authors (Bell, Eberhard, Bohm and Hiley) suggested that quantum correlations could be due to superluminal communications (tachyons) that propagate isotropically with velocity vt > c in a preferred reference frame. For finite values of vt, Quantum Mechanics and superluminal models lead to different predictions. Some years ago a Geneva group and our group did experiments on entangled photons to evidence possible discrepancies between experimental results and quantum predictions. Since no discrepancy was found, these experiments established only lower bounds for the possible tachyon velocities vt. Here we propose an improved experiment that should lead us to explore a much larger range of possible tachyon velocities Vt for any possible direction of velocity of the tachyons preferred frame.

[发布机构] High School XXV Aprile, Via Milano 2, I-56025 Pontedera (Pisa), Italy^1;Department of Physics Enrico Fermi, Largo Pontecorvo 3, I-56127 Pisa, Italy^2

[效力级别] 力学 [学科分类] 力学，机械学

[关键词] Entangled particles;Entangled photons;Hidden variable;Lower bounds;Quantum correlations;Quantum prediction;Reference frame;Superluminal communication