Quantum nonlocality obtained from local states by entanglement purification
arXiv:quant-ph/0502026 · doi:10.1103/PhysRevLett.94.040504
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.
4 pages, 4 figures
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