Compact Continuous-Variable Entanglement Distillation

Animesh Datta, Lijian Zhang, Joshua Nunn, Nathan K. Langford, Alvaro Feito, Martin B. Plenio, and Ian A. Walmsley
Phys. Rev. Lett. 108, 060502 – Published 8 February 2012
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Abstract

We introduce a new scheme for continuous-variable entanglement distillation that requires only linear temporal and constant physical or spatial resources. Distillation is the process by which high-quality entanglement may be distributed between distant nodes of a network in the unavoidable presence of decoherence. The known versions of this protocol scale exponentially in space and doubly exponentially in time. Our optimal scheme therefore provides exponential improvements over existing protocols. It uses a fixed-resource module—an entanglement distillery—comprising only four quantum memories of at most 50% storage efficiency and allowing a feasible experimental implementation. Tangible quantum advantages are obtainable by using existing off-resonant Raman quantum memories outside their conventional role of storage.

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  • Received 2 August 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.060502

© 2012 American Physical Society

Authors & Affiliations

Animesh Datta1,*, Lijian Zhang1,†, Joshua Nunn1, Nathan K. Langford1, Alvaro Feito2, Martin B. Plenio3,4, and Ian A. Walmsley1

  • 1Clarendon Laboratory, Department of Physics, University of Oxford, OX1 3PU, United Kingdom
  • 2Vestas Technology Research & Development, Venture Quays, East Cowes, PO32 6EZ, United Kingdom
  • 3Institut für Theoretische Physik, Albert-Einstein-Allee 11, Universität Ulm, D-89069 Ulm, Germany
  • 4QOLS, Blackett Laboratory, Imperial College London, Prince Consort Road, SW7 2BW, United Kingdom

  • *animesh.datta@physics.ox.ac.uk
  • lijian.zhang@physics.ox.ac.uk

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Issue

Vol. 108, Iss. 6 — 10 February 2012

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