Experimental implementation of quantum entanglement and hyperentanglement with a fiber-based two-photon source

Jun Chen, Matthew D. Eisaman, Elizabeth Goldschmidt, Jingyun Fan, Alan Migdall

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We describe the generation of entangled and hyperentangled photon pairs using a microstructure-fiber Sagnac interferometer, which is formed by a polarizing beam splitter and a highly nonlinear microstructure fiber twisted by 90° from end to end. This interferometer allows two identical four-wave mixing processes to occur on the same fiber principal axis, ensuring perfect spatial and temporal mode matching of the two four-wave mixing outputs on the polarizing beam splitter to create entanglement over the entire four-wave mixing phase-matching spectral range. With an average pump power of 220 μW, we measure a two-photon coincidence rate of 1 kHz with Δλ = 0.9 nm. Two-photon interference visibilities exceed 91% for polarization-entangled photon pairs generated from this source, and are > 84% for both time-bin and polarization degrees of freedom for hyperentangled photons, all without subtracting accidental coincidences.

Original languageEnglish (US)
Title of host publicationQuantum Communications and Quantum Imaging VI
StatePublished - Nov 12 2008
Externally publishedYes
EventQuantum Communications and Quantum Imaging VI - San Diego, CA, United States
Duration: Aug 12 2008Aug 14 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherQuantum Communications and Quantum Imaging VI
Country/TerritoryUnited States
CitySan Diego, CA


  • Entanglement
  • Four-wave mixing
  • Hyperentanglement
  • Microstructure fiber
  • Sagnac interferometer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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