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Proceedings Paper

Multiphoton entanglement
Author(s): Mohamed Bourennane; Manfred Eibl; Sascha Gaertner; Nicolai Kiesel; Christian Kurtsiefer; Marek Zukowski; Harald Weinfurter
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Paper Abstract

Multiphoton entanglement is the basis of many quantum communication schemes, quantum cryptographic protocols, and fundamental tests of quantum theory. Spontaneous parametric down-conversion is the most effective source for polarization entangled photon pairs. Here we show, that a entangled 4-photon state can be directly created by parametric down-conversion. This state exhibit perfect quantum correlations and a high robustness of entanglement against photon loss. We have used this state for four-particle test of local realistic theories. Therefore this state can be used for new types of quantum communication. We also report on possibilities for the experimentally realization of a 3-photon entangled state, the so called W-state, and discuss some of its properties.

Paper Details

Date Published: 13 September 2002
PDF: 9 pages
Proc. SPIE 4917, Quantum Optics in Computing and Communications, (13 September 2002); doi: 10.1117/12.483039
Show Author Affiliations
Mohamed Bourennane, Ludwig-Maximilians-Univ. Muenchen and Max-Planck-Institut fuer Quantenoptik (Germany)
Manfred Eibl, Ludwig-Maximilians-Univ. Muenchen and Max-Planck-Institut fuer Quantenoptik (Germany)
Sascha Gaertner, Ludwig-Maximilians-Univ. Muenchen and Max-Planck-Institut fuer Quantenoptik (Germany)
Nicolai Kiesel, Ludwig-Maximilians-Univ. Muenchen and Max-Planck-Institut fuer Quantenoptik (Germany)
Christian Kurtsiefer, Ludwig-Maximilians-Univ. Muenchen and Max-Planck-Institut fuer Quantenoptik (Germany)
Marek Zukowski, Astrofizyki Uniw./Gdanski (Poland)
Harald Weinfurter, Ludwig-Maximilians-Univ. Muenchen and Max-Planck-Institut fuer Quantenoptik (Germany)


Published in SPIE Proceedings Vol. 4917:
Quantum Optics in Computing and Communications
Songhao Liu; Guangcan Guo; Hoi-Kwong Lo; Nobuyuki Imoto, Editor(s)

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