Quantum nonlocality obtained from local states by entanglement purification

Details Quantum nonlocality obtained from local states by entanglement purification Quantum nonlocality obtained from local states by entanglement purification

2005-02-03

arxiv.org/abs/quant-ph/0502026v1

Phys. Rev. Lett. 94, 040504 (2005)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.040504

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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