Detection of hidden entanglement by photon anti-bunching

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

Journal: arXiv: quant-ph

Page(s): 0807.4437

Year: 2008

DOI Number: --

Link: Link to publication


Two-photon anti-bunching at a beamsplitter is only possible if the photons are entangled in one specific state, anti-symmetric in the modes. Thus, detection of anti-bunching is a direct indication of entanglement in a variable which might not be directly accessible in an experiment, since the total state of two photons must be symmetric. We demonstrate this explicitly quantitatively in the case of frequency entanglement of two photons with continuous frequency detunings. The principle of detecting hidden entanglement via anti-bunching at a beamsplitter may facilitate the observation of entanglement in other systems, like atomic ensembles or BECs. The analogue in fermionic systems would be to observe bunching.

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