Quantum Nonlocality Obtained from Local States by Entanglement Purification

Philip Walther, Katharina Resch, Č. Brukner, Aephraim M. Steinberg, Jian-Wei Pan, Anton Zeilinger

Abstract

We have applied an entanglement purification protocol to produce a single entangled pair of photons capable of violating a CHSH 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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