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Experimental purification of coherent states

Ulrik L. Andersen, Radim Filip, Jaromír Fiurášek, Vincent Josse, and Gerd Leuchs
Phys. Rev. A 72, 060301(R) – Published 1 December 2005

Abstract

We propose a scheme for optimal Gaussian purification of coherent states from several imperfect copies. The proposal is experimentally demonstrated for the case of two copies of a coherent state sent through independent noisy channels. Our purification protocol relies on only linear optics and an ancilla vacuum state, rendering this approach an interesting alternative to the more complex protocols of entanglement distillation and quantum error correction.

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  • Received 27 January 2005

DOI:https://doi.org/10.1103/PhysRevA.72.060301

©2005 American Physical Society

Authors & Affiliations

Ulrik L. Andersen1,*, Radim Filip2, Jaromír Fiurášek2, Vincent Josse1, and Gerd Leuchs1

  • 1Institut für Optik, Information und Photonik, Max-Planck Forschungsgruppe, Universität Erlangen-Nürnberg, Günther-Scharowsky Strasse 1, 91058, Erlangen, Germany
  • 2Department of Optics, Research Center for Optics, Palacky University, 17. Listopadu 50, 77200 Olomouc Czech Republic

  • *Electronic address: andersen@kerr.physik.uni-erlangen.de

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Issue

Vol. 72, Iss. 6 — December 2005

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