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Polarization-Entangled Photon Pairs Using Spontaneous Four-Wave Mixing in a Fiber Loop

Almeida, A. ; Carneiro, S. R. ; Silva, N. A. ; Muga, N. J. ; Pinto, A. N.

Polarization-Entangled Photon Pairs Using Spontaneous Four-Wave Mixing in a Fiber Loop, Proc EUROCON and CONFTELE 2011, Lisboa, Portugal, Vol. 1, pp. 1 - 4, April, 2011.

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Abstract
We generate polarization-entangled photon pairs in
the 1550-nm wavelength telecom band, using spontaneous fourwave
mixing in a highly nonlinear fiber loop. With accidental
coincidences subtracted, we obtain coincidence fringes with
visibilities greater than 86%, and thus observe a violation of
Clauser, Horne, Shimony and Holt (CHSH) inequality by 2.7
standard deviations. The experimental setup is built using only
fiber connections, which contribute to its long time stability.