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APS » Journals » Phys. Rev. Lett. » Volume 95 » Issue 21
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Phys. Rev. Lett. 95, 210502 (2005) [4 pages]

Experimental Analysis of a Four-Qubit Photon Cluster State

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Nikolai Kiesel1,2, Christian Schmid1,2, Ulrich Weber1,2, Géza Tóth2, Otfried Gühne3, Rupert Ursin4, and Harald Weinfurter1,2
1Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
2Department für Physik, Ludwig-Maximilians-Universität, D-80797 München, Germany
3Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, A-6020 Innsbruck, Austria
4Institut für Experimentalphysik, Universität Wien, A-1090 Wien, Austria

Received 29 June 2005; published 16 November 2005

Linear-optics quantum logic operations enabled the observation of a four-photon cluster state. We prove genuine four-partite entanglement and study its persistency, demonstrating remarkable differences from the usual Greenberger-Horne-Zeilinger (GHZ) state. Efficient analysis tools are introduced in the experiment, which will be of great importance in further studies on multiparticle entangled states.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.210502
DOI:
10.1103/PhysRevLett.95.210502
PACS:
03.67.Mn, 03.65.Ud, 03.67.Hk
 
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