W. Tittel, J. Brendel, B. Gisin, T. Herzog, H. Zbinden, N. Gisin
Published 1997-07-22, updated 1998-06-12Version 3
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.
Comments: 5 pages, REVTeX, 3 postscript figures included
Journal: Phys. Rev. A 57, 3229 (1998)
Comment on ``Experimental demonstration of the violation of local realism without Bell inequalities'' by Torgerson et al
Experimental demonstration of quantum memory for light
Experimental demonstration of quantum lithography beyond diffraction limit via Rabi oscillations
