Precise quantum tomography of photon pairs with entangled orbital angular momentum

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Jack, B. and Leach, J. and Ritsch, H. and Barnett, S.M. and Padgett, M.J. and Franke-Arnold, S. (2009) Precise quantum tomography of photon pairs with entangled orbital angular momentum. New Journal of Physics, 11. 103024. ISSN 1367-2630 (https://doi.org/10.1088/1367-2630/11/10/103024)

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Abstract

We report a high fidelity tomographic reconstruction of the quantum state of photon pairs generated by parametric down-conversion with orbital angular momentum (OAM) entanglement. Our tomography method allows us to estimate an upper and lower bound for the entanglement between the down-converted photons. We investigate the two-dimensional state subspace defined by the OAM states ± and superpositions thereof, with =1, 2, ..., 30. We find that the reconstructed density matrix, even for OAMs up to around =20, is close to that of a maximally entangled Bell state with a fidelity in the range between F=0.979 and F=0.814. This demonstrates that, although the single count-rate diminishes with increasing , entanglement persists in a large dimensional state space.

  • Item type:Article
    ID code:18921
    Dates:
    Date
    Event
    12 October 2009
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Strathprints Administrator
    Date deposited:18 Jun 2010 15:47
    Last modified:11 Nov 2024 09:27
    URI:https://strathprints.strath.ac.uk/id/eprint/18921
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