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Time-Resolved Up-Conversion of Entangled Photon Pairs

Source: Phys. Rev. Lett. 103, 123602 (2009); doi:10.1103/PhysRevLett.103.123602

Published 18 September 2009

EDITORIALLY RELATED
  1. Phys. Rev. Focus 24, story 11
PACS
  • 42.50.Dv
    Quantum state engineering and measurements (quantum optics)
  • 03.65.Ud
    Entanglement and quantum nonlocality
  • 42.65.Lm
    Parametric down conversion and production of entangled photons
  • 42.65.Re
    Ultrafast processes; optical pulse generation and pulse compression
  • YEAR: 2009
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PUBLICATION DATA
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Kevin A. O'Donnell1 and Alfred B. U'Ren2
1División de Física Aplicada, Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana Número 3918, 22860 Ensenada, Baja California, México
2Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Apartado Postal 70-543, 04510 Distrito Federal, México
In the process of spontaneous parametric down-conversion, photons from a pump field are converted to signal and idler photon pairs in a nonlinear crystal. The reversed process, or up-conversion of these pairs back to single photons in a second crystal, is also possible. Here, we present experimental measurements of the up-conversion rate with a controlled time delay introduced between the signal and idler photons. As a function of delay, this rate presents a full width at half maximum of 27.9 fs under our experimental conditions, and we further demonstrate that group delay dispersion of the photon pairs broadens this width. These observations are in close agreement with our calculations, thus demonstrating an ultrafast, nonclassical correlation between the signal and idler waves. ©2009 The American Physical Society
History: Received 28 May 2009; published 18 September 2009
Permalink: http://link.aps.org/abstract/PRL/v103/e123602

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