Seminario en el ICF

[jorge hernandez cobos <jorge@xxxxxxxxxxx>]

(mensaje sin acentos)

Estimados colegas,

El dia de hoy en el horario del Seminario Interno del Instituto de 
Ciencias Fisicas
tendremos una interesante charla del Dr. Kevin O'Donnell del Centro de 
Investigación
Científica y de Educación Superior de /Ensenada/.

El titulo de su charla es:

"Como se ven los fotones?

Por ello los esperamos este jueves 25 de noviembre a las 17:30 horas en el
auditorio del Instituto de Ciencias Fisicas.

Saludos


Resumen:

The temporal dispersion of entangled photon pairs has long been of
interest. For example, nonlocal dispersion cancellation
of the two-photon state itself has been theoretically discussed, and the
dispersion cancellation occurring in the Hong-Ou-Mandel interferometer has
been experimentally demonstrated. However, direct observation of effects
of dispersion on the two-photon state, as measured through the
time-resolved coincidence rates of detected photon pairs, has been
severely limited by poor electronic timing resolution (1 ns).

Here, to overcome this limitation, a new, dispersion-sensitive
experimental approach is taken in which the entangled photon pairs are
upconverted in a nonlinear crystal. In particular, a delay is introduced
between the signal and idler modes, and the upconverted photon rate is
measured as a function of. The temporal resolution is determined by the
positioning accuracy of the mirror producing the delay, and is thus 1 fs.
The approach is analogous to that taken in the common autocorrelation
method of ultrafast laser pulse characterization.