Detection of Polarization Entanglement after 75 km of Fiber Transmission
Andreas Poppe, Hannes Hübel, T. Lederer, Alessandro Fedrizzi, Michael Ross Vanner, Anton Zeilinger · 2006
Polarization entanglement was measured over 75km of singlemode fiber. In the first 60km only minimal degradation of polarization entanglement was observed leaving sufficient visibility for secure quantum communication.