Experimental demonstration of quantum correlations over more than 10 km

Details Experimental demonstration of quantum correlations over more than 10 km Experimental demonstration of quantum correlations over more than 10 km

1997-07-22

arxiv.org/abs/quant-ph/9707042v3

Phys. Rev. A 57, 3229 (1998)

Physics

Quantum Physics

5 pages, REVTeX, 3 postscript figures included

Scientific paper

10.1103/PhysRevA.57.3229

Energy and time entangled photons at a wavelength of 1310 nm are produced by parametric downconversion in a KNbO3 crystal and are sent into all-fiber interferometers using a telecom fiber network. The two interferometers of this Franson-type test of the Bell-inequality are located 10.9 km apart from one another. Two-photon fringe visibilities of up to 81.6 % are obtained. These strong nonlocal correlations support the nonlocal predictions of quantum mechanics and provide evidence that entanglement between photons can be maintained over long distances.

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