Zhong, T., Hu, X., Wong, F. N. C., Berggren, K. K., Roberts, T. D., & Battle, P. (2010). High-quality fiber-optic polarization entanglement distribution at 1.3 μm telecom wavelength. Opt. Lett., 35(9), 1392–1394.
Abstract: We demonstrate high-quality distribution of 1.3 μm polarization-entangled photons generated from a fiber-coupled periodically poled KTiOPO4 waveguide over 200 m fiber-optic cables. Time-multiplexed measurements with a 19% efficient superconducting nanowire single-photon detector at the remote location show a detected flux of 5.8 pairs / s at a pump power of 25 μW and an average two-photon quantum-interference visibility of 97.7% without subtraction of accidentals.
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