par Olislager, Laurent ;Mbodji, Ismael;Woodhead, Erik ;Cussey, Johann;Furfaro, Luca;Emplit, Philippe ;Massar, Serge ;Phan Huy, Kien ;Merolla, Jean-Marc
Référence New Journal of Physics, 14, 4, 043015
Publication Publié, 2012-04-17
Référence New Journal of Physics, 14, 4, 043015
Publication Publié, 2012-04-17
Article révisé par les pairs
Résumé : | Frequency-entangled photons can be readily produced using parametric down-conversion. We have recently shown how such entanglement could be manipulated and measured using electro-optic phase modulators and narrow-band frequency filters, thereby leading to two-photon interference patterns in the frequency domain. Here we introduce new theoretical and experimental developments showing that this method is potentially a competitive platform for the realization of quantum communication protocols in standard telecommunication fibres. We derive a simple theoretical expression for the coincidence probabilities and use it to optimize a Bell inequality. Furthermore, we establish an equivalence between the entangled-photon scheme and a classical interference scheme. Our measurements of two-photon interference in the frequency domain yield raw visibilities in excess of 99%. We use our high-quality setup to experimentally validate the theoretical predictions, and in particular we report a violation of the CH74 inequality by more than 18 standard deviations. |