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Phys. Rev. Lett. 94, 040504 (2005) [4 pages]

Quantum Nonlocality Obtained from Local States by Entanglement Purification

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P. Walther1, K. J. Resch1, Č. Brukner1, A. M. Steinberg1,2, J.-W. Pan1,3, and A. Zeilinger1,4
1Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, 1090 Vienna, Austria
2Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7
3Physikalisches Institut, Universität Heidelberg, D-69120 Heidelberg, Germany
4IQOQI, Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Austria

Received 9 September 2004; published 1 February 2005

We have applied an entanglement purification protocol to produce a single entangled pair of photons capable of violating a Clauser-Horne-Shimony-Holt Bell inequality from two pairs that individually could not. The initial poorly entangled photons were created by a controllable decoherence that introduced complex errors. All of the states were reconstructed using quantum state tomography which allowed for a quantitative description of the improvement of the state after purification.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.040504
DOI:
10.1103/PhysRevLett.94.040504
PACS:
03.65.Ud, 03.65.Ta, 03.67.Mn, 42.50.Xa
 
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