[Todos] Coloquios del Departamento de Física (hoy jueves 15/9, traer taza p el cafe !)

[pdmitruk en df.uba.ar]

Recordamos el coloquio de hoy,

  (y los que puedan traigan tacita p el cafe)

               COLOQUIOS DEL DEPARTAMENTO DE FÍSICA FCEyN - UBA

                                 http://coloquios.df.uba.ar/

                                 Charla, café y galletitas
                   En el Aula Federman, 1er piso, Pabellón I,
                                   Ciudad Universitaria

                               Jueves 15 de septiembre, 14hs,

               NON-LOCAL EFFECTS OF SPATIALLY CORRELATED PHOTONS

                                      Stephen Walborn

                       Universidad Federal de Rio de Janeiro

   The spatial correlations of photon pairs produced by spontaneous
parametric
   down-conversion have been studied for nearly forty years.  They appear
   simultaneously in the complementary near- and far-field transverse
variables of the photons.  It has been shown that these correlations are
   quantum-mechanical in nature, and give rise to a number of non-classical
   effects that could be exploited for improved imaging and metrology, as
well
   as more secure communications.  In this seminar I?ll discuss two recent
   experiments that illustrate several novel non-local aspects of spatial
   correlations.  The first shows that appropriately engineered photons
violate a non-locality witness based on entropy functions, which shows that
the correlations cannot be described by a local ?classical? model.  In the
   second experiment, an analog of an optical vortex, such as that which
   appears in a classical optical beam with non-zero orbital angular
momentum,
   is observed in a non-local coordinate plane.  In this sense the optical
   vortex appears in the correlations of the photon pairs.

    
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