Experimental verification of energy correlations in entangled photon pairs

Details Experimental verification of energy correlations in entangled photon pairs Experimental verification of energy correlations in entangled photon pairs

2003-06-03

arxiv.org/abs/quant-ph/0306020v1

Physics

Quantum Physics

8 pages, 7 figures

Scientific paper

Properties of entangled photon pairs generated in spontaneous parametric down-conversion are investigated in interference experiments. Strong energy correlations are demonstrated in a direct way. If a signal photon is detected behind a narrow spectral filter, then interference appears in the Mach-Zehnder interferometer placed in the route of the idler photon, even if the path difference in the interferometer exceeds the coherence length of the light. Narrow time correlations of the detection instants are demonstrated for the same photon-pair source using the Hong-Ou-Mandel interferometer. Both these two effects may be exhibited only by an entangled state.

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