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Phys Rev Lett. 2004 Jul 9;93(2):020504. Epub 2004 Jul 9.

Realization of a photonic controlled-NOT gate sufficient for quantum computation.

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Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria.


We report the first experimental demonstration of a quantum controlled-NOT gate for different photons, which is classically feed forwardable. In the experiment, we achieved this goal with only the use of linear optics, an entangled ancillary pair of photons, and postselection. The techniques developed in our experiment are of significant importance for quantum information processing with linear optics.

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