Pruebas experimentales de teorías de variables ocultas no ergódicas mediante time stamping

MÓNICA AGÜERO; M.KOVALSKY; A. HNILO; M. LAROTONDA

Congreso; 95 reunión de la Asociación Física Argentina; 2010

Asociación Física Argentina

The Einstein-Podolsky-Rosen paradox involves strong contradictions between Quantum Mechanics (QM) predictions and intuitive notions on realism and locality. However, QM predictions assume that the measurements are performed on identically prepared copies of the system. The differences on the observed results are then a consequence of the intrinsic randomness of the microscopic world. On the other hand, the non-ergodic theories (NET) assume that there is an interaction or memory between the consecutive observations. Therefore, the observed results are the consequence of some complex dynamics underlying that takes into account the system’s history and/or the influence of the environment. If one considers theories in which a single polarization measurement depends of previous particle-polarizer interactions, then it is possible to manufacture local hidden variable theories that reproduce the QM predictions. These dynamics cannot be detected by measuring average magnitudes but they may be found through the analysis of the series formed by the time of observation of each single event (the detection of a photon, in our case). Our experiment records photon’s arrival times in each detector (“time stamping”) with a time resolution of 12.5 ns. The pairs are generated by spontaneous parametric down-conversion (SPDC) using a CW diode laser at 405 nm and type-I BBO crystals. The temporal series allow us to study if there exist some underlying dynamics (eventually chaotic) in contradiction with the QM predictions. From these time-resolved data we can measure the statistically average magnitudes involved in the Bell’s inequalities (SCHSH) and also to search for signs of a non-ergodic behavior of the system. Also, we present results of our numerical analysis of the time stamping measurements from the experiment performed in Innsbruck in 1998 with random variable polarizers.