We investigate the spatio-temporal structure of the biphoton entanglement in parametric down-conversion (PDC) and we demonstrate its non-factorable X-shaped geometry. Such a structure gives access to the ultrabroad bandwidth of PDC, and can be exploited to achieve a biphoton temporal localization in the femtosecond range. This extreme localization is conditioned by our ability to resolve the photon positions in the source near field. The nonfactorability opens the possibility of tailoring the temporal entanglement by acting on the spatial degrees of freedom of twin photons. We also put in evidence distinctive features that characterize type II with respect to type I PDC

Entanglement of PDC photon pairs

BRAMBILLA, ENRICO;LUGIATO, LUIGI;
2009-01-01

Abstract

We investigate the spatio-temporal structure of the biphoton entanglement in parametric down-conversion (PDC) and we demonstrate its non-factorable X-shaped geometry. Such a structure gives access to the ultrabroad bandwidth of PDC, and can be exploited to achieve a biphoton temporal localization in the femtosecond range. This extreme localization is conditioned by our ability to resolve the photon positions in the source near field. The nonfactorability opens the possibility of tailoring the temporal entanglement by acting on the spatial degrees of freedom of twin photons. We also put in evidence distinctive features that characterize type II with respect to type I PDC
2009
Brambilla, Enrico; Caspani, L.; Lugiato, Luigi; Gatti, A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/1787516
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