Local Conversion of Greenberger-Horne-Zeilinger States to Approximate W States

P. Walther, K. J. Resch, and A. Zeilinger
Phys. Rev. Lett. 94, 240501 – Published 22 June 2005

Abstract

Genuine 3-qubit entanglement comes in two different inconvertible types represented by the Greenberger-Horne-Zeilinger (GHZ) state and the W state. We describe a specific method based on local positive operator valued measures and classical communication that can convert the ideal N-qubit GHZ state to a state arbitrarily close to the ideal N-qubit W state. We then experimentally implement this scheme in the 3-qubit case and characterize the input and the final state using 3-photon quantum state tomography.

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  • Received 20 December 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.240501

©2005 American Physical Society

Authors & Affiliations

P. Walther1,*, K. J. Resch1,*, and A. Zeilinger1,2

  • 1Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, 1090 Vienna, Austria
  • 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Austria

  • *Corresponding author.

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Vol. 94, Iss. 24 — 24 June 2005

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