Ikin, L., Carberry, D.M., Gibson, G.M., Padgett, M.J. and Miles, M.J. (2009) Assembly and force measurement with SPM-like probes in holographic optical tweezers. New Journal of Physics, 11(2), 023012. (doi: 10.1088/1367-2630/11/2/023012)
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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 ±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 |
Authors: | Ikin, L., Carberry, D.M., Gibson, G.M., Padgett, M.J., and Miles, M.J. |
College/School: | College of Science and Engineering > School of Physics and Astronomy |
Journal Name: | New Journal of Physics |
Journal Abbr.: | New J. Phys. |
Publisher: | Institute of Physics Publishing Ltd. |
ISSN (Online): | 1367-2630 |
Published Online: | 12 October 2009 |
Copyright Holders: | Copyright © 2009 Institute of Physics Publishing Ltd. |
First Published: | First published in New Journal of Physics 11 (2): 023012 |
Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher |
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