We analyze the high gain spontaneous parametric down-conversion in a non collinear geometry as a paradigmatic scenario to investigate the observation of nonlocal properties when the size of the system is increased while keeping fixed the measurement resolution. We observe theoretically a fast decrease in the amount of Bell's inequality violation when the number of particles is increased, due to the low resolution of the measurement apparatus. This theoretical analysis is supported by the experimental observation of macro-macro correlations with an average number of photons of about 10(3). Our results enlighten the practical extreme difficulty of observing non-locality by performing such a dichotomic fuzzy measurement.
Quantum-to-classical transition via fuzzy measurements on high gain spontaneous parametric down-conversion / Spagnolo, Nicolo'; Vitelli, Chiara; Lorenzo, Toffoli; Sciarrino, Fabio; DE MARTINI, Francesco. - 1363:(2011), pp. 267-270. (Intervento presentato al convegno 10th International Conference on Quantum Communication, Measurement and Computing (QCMC) tenutosi a Brisbane, AUSTRALIA) [10.1063/1.3630193].
Quantum-to-classical transition via fuzzy measurements on high gain spontaneous parametric down-conversion
SPAGNOLO, NICOLO';VITELLI, Chiara;SCIARRINO, Fabio;DE MARTINI, Francesco
2011
Abstract
We analyze the high gain spontaneous parametric down-conversion in a non collinear geometry as a paradigmatic scenario to investigate the observation of nonlocal properties when the size of the system is increased while keeping fixed the measurement resolution. We observe theoretically a fast decrease in the amount of Bell's inequality violation when the number of particles is increased, due to the low resolution of the measurement apparatus. This theoretical analysis is supported by the experimental observation of macro-macro correlations with an average number of photons of about 10(3). Our results enlighten the practical extreme difficulty of observing non-locality by performing such a dichotomic fuzzy measurement.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
