Jack, B., Leach, J., Ritsch, H., Barnett, S.M., Padgett, M.J. and Franke-Arnold, S. (2009) Precise quantum tomography of photon pairs with entangled orbital angular momentum. New Journal of Physics, 11, p. 103024. (doi: 10.1088/1367-2630/11/10/103024)
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Publisher's URL: http://dx.doi.org/10.1088/1367-2630/11/10/103024
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 ±ℓ and superpositions thereof, with ℓ=1, 2, ..., 30. We find that the reconstructed density matrix, even for OAMs up to around ℓ=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 ℓ, entanglement persists in a large dimensional state space.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Padgett, Professor Miles and Franke-Arnold, Professor Sonja |
Authors: | Jack, B., Leach, J., Ritsch, H., Barnett, S.M., Padgett, M.J., and Franke-Arnold, S. |
College/School: | College of Science and Engineering > School of Physics and Astronomy |
Journal Name: | New Journal of Physics |
Publisher: | IOP Publishing: |
ISSN: | 1367-2630 |
ISSN (Online): | 1367-2630 |
Copyright Holders: | Copyright © 2009 Deutsche Physikalische Gesellschaft |
First Published: | First published in New Journal of Physics 11 |
Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher |
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