Anti-symmetrization reveals hidden entanglement

Alessandro Fedrizzi, Thomas Herbst, Markus Aspelmeyer, Marco Barbieri, Thomas Jennewein, Anton Zeilinger

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Two-photon anti-bunching at a beamsplitter is only possible if the photons are entangled in a specific state, anti-symmetric in the spatial modes. Thus, observation of anti-bunching is an indication of entanglement in a degree of freedom, which might not be easily accessible in an experiment. We experimentally demonstrate this concept in the case of the interference of two frequency-entangled photons with continuous frequency detunings. The principle of anti-symmetrization of the spatial part of a wavefunction and subsequent detection of hidden entanglement via anti-bunching at a beamsplitter may facilitate the observation of entanglement in other systems, like atomic ensembles or Bose-Einstein condensates. The analogue for fermionic systems would be to observe bunching.

Original languageEnglish
Article number103052
Number of pages9
JournalNew Journal of Physics
Volume11
DOIs
Publication statusPublished - 27 Oct 2009

Keywords

  • PARAMETRIC DOWNCONVERSION
  • INTERFERENCE
  • PHOTONS
  • ELECTRONS

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