Testing for entanglement with periodic coarse graining

Tasca, D.S., Rudnicki, Ł., Aspden, R.S., Padgett, M.J. , Souto Ribeiro, P.H. and Walborn, S.P. (2018) Testing for entanglement with periodic coarse graining. Physical Review A, 97(4), 042312. (doi:10.1103/PhysRevA.97.042312)

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Abstract

Continuous-variable systems find valuable applications in quantum information processing. To deal with an infinite-dimensional Hilbert space, one in general has to handle large numbers of discretized measurements in tasks such as entanglement detection. Here we employ the continuous transverse spatial variables of photon pairs to experimentally demonstrate entanglement criteria based on a periodic structure of coarse-grained measurements. The periodization of the measurements allows an efficient evaluation of entanglement using spatial masks acting as mode analyzers over the entire transverse field distribution of the photons and without the need to reconstruct the probability densities of the conjugate continuous variables. Our experimental results demonstrate the utility of the derived criteria with a success rate in entanglement detection of ∼60% relative to 7344 studied cases.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Aspden, Mr Reuben and Padgett, Professor Miles
Authors: Tasca, D.S., Rudnicki, Ł., Aspden, R.S., Padgett, M.J., Souto Ribeiro, P.H., and Walborn, S.P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review A
Publisher:American Physical Society
ISSN:2469-9926
ISSN (Online):2469-9934
Published Online:09 April 2018
Copyright Holders:Copyright © 2018 The American Physical Society
First Published:First published in Physical Review A 97(4):042312
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
624501TWISTS - Twists & more: the complex shape of lightMiles PadgettEuropean Research Council (ERC)340507S&E P&A - PHYSICS & ASTRONOMY