Precise quantum tomography of photon pairs with entangled orbital angular momentum

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
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Padgett, Professor Miles and Franke-Arnold, Dr 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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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
474271Full-field quantum imagingMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)EP/G011656/1Physics and Astronomy