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Phys. Rev. A 72, 060301(R) (2005) [4 pages]

Experimental purification of coherent states

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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

Received 27 January 2005; published 1 December 2005

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.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.72.060301
DOI:
10.1103/PhysRevA.72.060301
PACS:
03.67.Pp, 03.67.Hk, 42.50.Lc

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

 
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