Anti-symmetrization reveals hidden entanglement

Author(s): A. Fedrizzi, T. Herbst, M. Aspelmeyer, M. Barbieri, T. Jennewein, A. Zeilinger

Journal: New Journal of Physics

Volume: 11

Page(s): 103052

Year: 2009

DOI Number: 10.1088/1367-2630/11/10/103052

Link: Link to publication


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.


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