Alessandro Fedrizzi et al 2009 New J. Phys. 11 103052 doi:10.1088/1367-2630/11/10/103052
Anti-symmetrization reveals hidden entanglement
Alessandro Fedrizzi1,3, Thomas Herbst1, Markus Aspelmeyer1, Marco Barbieri3,4, Thomas Jennewein1,3,5 and Anton Zeilinger1,2
Show affiliationsTwo-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.
- PACS
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42.50.Dv Quantum state engineering and measurements
- Subjects
- Dates
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Issue 10 (October 2009)
Received 17 July 2009
Published 27 October 2009
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Anti-symmetrization reveals hidden entanglement
Alessandro Fedrizzi et al 2009 New J. Phys. 11 103052
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