[Todos] coloquio del GEA

[Marina Inchaussandague]

Hola,

El  lunes  19  de  noviembre  a las 14 hs dará una charla el Dr. Kevin
OŽDonnell, investigador del CICESE (Centro de Investigación Científica
y de Educación Superior de Ensenada), México. Están todos cordialmente
invitados.

Lugar: Aula de Seminarios, Pab. I, FCEyN, UBA

Título: "Recombination of Entangled Photon Pairs"

Resumen:  Much research has studied the quantum entanglement of photon
pairs  created by splitting the photons of a pump laser in a nonlinear
crystal.  Here, we describe recent experimental work done at CICESE in
which the entangled photon pairs are recombined back to single photons
in  a  second  nonlinear  crystal,  but  with  a time delay introduced
between  pair  members.  Unlike  the Mandel two-photon interferometer,
these   observations   are   sensitive  to  temporal  dispersion  (ie,
stretching  or  compression)  of  ultrafast photon wavepackets, and so
permit observation of previously unseen effects like Franson's quantum
dispersion   cancellation.   Quantum  vacuum  fluctuations  allow  the
recombined  pairs  to  reconstruct the phase structure of the original
pump  beam,  even  though  the  pairs  are incoherent in the classical
sense.  Under  certain experimental conditions, classical interference
is  observed in the recombination rate due to mixing of the signal and
idler modes. Potential applications, particularly in biophotonics, are
discussed.

Saludos,

-- 
Marina Inchaussandague
Grupo de Electromagnetismo Aplicado,
Dto. de Física, FCEyN, UBA.