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Phys Rev Lett. 2006 Jun 23;96(24):240502. Epub 2006 Jun 21.

Experimental interference of independent photons.

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Institute for Experimental Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria.


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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