Quantum nonlocality obtained from local states by entanglement purification

Author(s): P. Walther, K. J. Resch, Č. Brukner, A. Steinberg, J. W. Pan, A. Zeilinger

Journal: Physical Review Letters

Volume: 94

Page(s): 040504

Year: 2005

DOI Number: 10.1103/PhysRevLett.94.040504

Link: Link to publication

Abstract:

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.

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Zeilinger Group Zeilinger Group , Brukner Group