Experimental verification of high spectral entanglement for pulsed waveguided spontaneous parametric down-conversion

M. Avenhaus, M. V. Chekhova, Leonid Krivitsky, G. Leuchs, C. Silberhorn

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Abstract

We study the spectral properties of spontaneous parametric down-conversion (SPDC) in a periodically poled waveguided structure of potassium-titanyl-phosphate (KTP) crystal pumped by ultrashort pulses. Our theoretical analysis reveals a strongly entangled and asymmetric structure of the two-photon spectral amplitude for type-II SPDC. We confirm these predictions experimentally by measuring single-photon spectra, on one hand, and the dependence of Hong-Ou-Mandel interference visibility on the width of spectral filtering, on the other hand.
Original languageEnglish
JournalPhysical Review A
Volume79
Issue number4
Pages (from-to)043836
ISSN2469-9926
DOIs
Publication statusPublished - 2009

Bibliographical note

Copyright 2009 American Physical Society

Keywords

  • quantum entanglement
  • quantum optics
  • two-photon spectra
  • high-speed optical techniques
  • optical frequency conversion
  • optical pumping
  • optical waveguide filters

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