High-fidelity entanglement swapping with fully independent sources

Details High-fidelity entanglement swapping with fully independent sources High-fidelity entanglement swapping with fully independent sources

2008-09-23

arxiv.org/abs/0809.3991v3

Phys. Rev. A 79, 040302(R) (2009)

Physics

Quantum Physics

added technical details and extended introduction and conclusion, slightly modified the abstract, corrected a mistake in the a

Scientific paper

10.1103/PhysRevA.79.040302

Entanglement swapping allows to establish entanglement between independent particles that never interacted nor share any common past. This feature makes it an integral constituent of quantum repeaters. Here, we demonstrate entanglement swapping with time-synchronized independent sources with a fidelity high enough to violate a Clauser-Horne-Shimony-Holt inequality by more than four standard deviations. The fact that both entangled pairs are created by fully independent, only electronically connected sources ensures that this technique is suitable for future long-distance quantum communication experiments as well as for novel tests on the foundations of quantum physics.

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