Continuous-variable entanglement distillation of non-Gaussian mixed states

Ruifang Dong, Mikael Lassen, Joel Heersink, Christoph Marquardt, Radim Filip, Gerd Leuchs, and Ulrik L. Andersen
Phys. Rev. A 82, 012312 – Published 13 July 2010

Abstract

Many different quantum-information communication protocols such as teleportation, dense coding, and entanglement-based quantum key distribution are based on the faithful transmission of entanglement between distant location in an optical network. The distribution of entanglement in such a network is, however, hampered by loss and noise that is inherent in all practical quantum channels. Thus, to enable faithful transmission one must resort to the protocol of entanglement distillation. In this paper we present a detailed theoretical analysis and an experimental realization of continuous variable entanglement distillation in a channel that is inflicted by different kinds of non-Gaussian noise. The continuous variable entangled states are generated by exploiting the third order nonlinearity in optical fibers, and the states are sent through a free-space laboratory channel in which the losses are altered to simulate a free-space atmospheric channel with varying losses. We use linear optical components, homodyne measurements, and classical communication to distill the entanglement, and we find that by using this method the entanglement can be probabilistically increased for some specific non-Gaussian noise channels.

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  • Received 29 January 2010

DOI:https://doi.org/10.1103/PhysRevA.82.012312

©2010 American Physical Society

Authors & Affiliations

Ruifang Dong1,2,*, Mikael Lassen1,2, Joel Heersink1,3, Christoph Marquardt1,3, Radim Filip4, Gerd Leuchs1,3, and Ulrik L. Andersen2

  • 1Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1/Bau 24, D-91058 Erlangen, Germany
  • 2Department of Physics, Technical University of Denmark, Building 309, DK-2800 Lyngby, Denmark
  • 3Institute of Optics, Information and Photonics, Friedrich-Alexander-University Erlangen-Nuremberg, Str. 7/B2, D-91058 Erlangen, Germany
  • 4Department of Optics, Palacký University, 17 Listopadu 50, CZ-77200 Olomouc, Czech Republic

  • *rdon@fysik.dtu.dk

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Vol. 82, Iss. 1 — July 2010

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