Physics – Quantum Physics
Scientific paper
2005-12-20
Opt. Express 14, 3453 (2006).
Physics
Quantum Physics
11 pages, 3 figures
Scientific paper
10.1364/OE.14.003453
This paper reports the first demonstration of the generation and distribution of entangled photon pairs in the 1.5-um band using spontaneous four-wave mixing in a cooled fiber. Noise photons induced by spontaneous Raman scattering were suppressed by cooling a dispersion shifted fiber with liquid nitrogen, which resulted in a significant improvement in the visibility of two-photon interference. By using this scheme, time-bin entangled qubits were successfully distributed over 60 km of optical fiber with a visibility of 76%, which was obtained without removing accidental coincidences.
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