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We demonstrate non-degenerate down-conversion at 810 and 1550 nm forlong-distance fiber based quantum communication using polarization entangledphoton pairs. Measurements of the two-photon visibility, without dark countsubtraction, have shown that the quantum correlations (raw visibility 89%)allow secure quantum cryptography after 100 km of non-zero dispersion shiftedfiber using commercially available single photon detectors. In addition,quantum state tomography has revealed little degradation of state negativity,decreasing from 0.99 at the source to 0.93 after 100 km, indicating minimalloss in fidelity during the transmission.

High-fidelity transmission of polarization encoded qubits from an entangled source over 100 km of fiber