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Fiber-Optical Communication System Using Polarization-encoding Photons

Almeida, A. ; Silva, N. A. ; Muga, N. J. ; Pinto, A. N.

Fiber-Optical Communication System Using Polarization-encoding Photons, Proc European Conf. on Networks and Optical Communications and Conf. on Optical Cabling and Infrastructure - NOC/OC, Faro, Portugal, Vol. 1, pp. 127 - 132, June, 2010.

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We present a single-photon source based on the stimulated four-wave mixing process with
adjustable linear state of polarization. This source allowed us to generate non-orthogonal
states of polarization, that can be used for quantum key distribution experiments. The
average number of photon counts as a function of the angle of the analyzer was obtained
for two non-orthogonal linear states of polarization. The results show an accurate detection
after propagation through a standard single-mode optical fiber with a length equal to
20 km. We also employed a master/slave configuration between two avalanche photodiodes,
in order to check the probability of our single-photon source to emit pulses with
more than one photon, for an average number of photons per pulse, μ ∼ 0.2, and consequently
the probability of a photon to choose one of the paths. Results show that our
experimental scheme is suitable for polarization-encoding experiments.