Experimental demonstration of quantum correlations over more than 10 km

W. Tittel; J. Brendel; B. Gisin; T. Herzog; H. Zbinden; N. Gisin

doi:10.1103/PhysRevA.57.3229

Experimental demonstration of quantum correlations over more than 10 km

Quantum Physics 2009-10-30 v3

Authors: W. Tittel , J. Brendel , B. Gisin , T. Herzog , H. Zbinden , N. Gisin

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Abstract

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.

Keywords

quantum correlations entangled photons parametric downconversion knbo3 crystal franson interferometer bell inequality nonlocal correlations

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@article{arxiv.quant-ph/9707042,
  title  = {Experimental demonstration of quantum correlations over more than 10 km},
  author = {W. Tittel and J. Brendel and B. Gisin and T. Herzog and H. Zbinden and N. Gisin},
  journal= {arXiv preprint arXiv:quant-ph/9707042},
  year   = {2009}
}

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5 pages, REVTeX, 3 postscript figures included

Experimental demonstration of quantum correlations over more than 10 km

Abstract

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