Assembly and force measurement with SPM-like probes in holographic optical tweezers

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
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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