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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.

Participante: Dr. Kevin O'Donnell

Institución: CICESE

Lugar: Auditorio ICF

Fecha y hora: Este evento terminó el Jueves, 25 de Noviembre de 2010