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Time-resolved up-conversion of entangled photon pairs.

Kevin A O'Donnell1, Alfred B U'Ren

  • 1División de Física Aplicada, Centro de Investigación Científica y de Educación Superior de Ensenada, 22860 Ensenada, Baja California, México.

Physical Review Letters
|October 2, 2009
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Summary

Researchers measured the up-conversion rate of photon pairs, observing an ultrafast correlation. This nonclassical correlation, influenced by time delay and dispersion, was confirmed by experimental data and calculations.

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Area of Science:

  • Quantum optics
  • Nonlinear optics

Background:

  • Spontaneous parametric down-conversion (SPDC) converts pump photons into signal and idler photon pairs.
  • The reverse process, photon pair up-conversion, can also occur in nonlinear crystals.

Purpose of the Study:

  • To experimentally measure the photon pair up-conversion rate.
  • To investigate the influence of time delay and group delay dispersion on the up-conversion rate.
  • To demonstrate the ultrafast, nonclassical correlation between signal and idler photons.

Main Methods:

  • Experimental measurement of up-conversion rate with controlled time delay between photon pairs.
  • Characterization of the full width at half maximum (FWHM) of the up-conversion rate as a function of delay.
  • Analysis of the effect of group delay dispersion on the up-conversion correlation width.

Main Results:

  • The up-conversion rate exhibited a FWHM of 27.9 fs under experimental conditions.
  • Group delay dispersion was shown to broaden the measured correlation width.
  • Experimental observations closely matched theoretical calculations.

Conclusions:

  • An ultrafast, nonclassical correlation between signal and idler photons was demonstrated.
  • The study validates theoretical predictions for photon pair up-conversion dynamics.
  • This work provides insights into controlling and understanding quantum correlations in nonlinear optical processes.