Experimental interference of independent photons.

@article{Kaltenbaek2006ExperimentalIO,
  title={Experimental interference of independent photons.},
  author={R. Kaltenbaek and B. Blauensteiner and M. Zukowski and M. Aspelmeyer and A. Zeilinger},
  journal={Physical review letters},
  year={2006},
  volume={96 24},
  pages={
          240502
        }
}
Interference of photons emerging from independent sources is essential for modern quantum-information processing schemes, above all quantum repeaters and linear-optics quantum computers. We report an observation of nonclassical interference of two single photons originating from two independent, separated sources, which were actively synchronized with a rms timing jitter of 260 fs. The resulting (two-photon) interference visibility was (83+/-4)%. 

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