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Nonlinear Optics

Fiber-optic sources for quantum communication

Prem Kumar, Marco Fiorentino B, Jay E. Sharping, Paul L. Voss

Published Jan 1, 2002• 0 citations
Publisher

Abstract

We present recent experimental progress towards demonstrating fiber-based sources of quadrature as well as polarization entanglement for quantum communication applications in the 1.5 µm band of standard telecommunication fiber.
DOI
10.1364/nlo.2002.mc1

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We present a fiber-based source of polarization-entangled photon pairs that is well suited for quantum communication applications in the 1.5μμμm band of standard telecommunication fiber. Quantum-correlated signal and idler photon pairs are produced when a nonlinear-fiber Sagnac interferometer is pumped in the anomalous-dispersion region of the fiber. Recently, we have demonstrated nonclassical properties of such photon pairs by using Geiger-mode InGaAs/InP avalanche photodiodes. Polarization entanglement in the photon pairs can be created by pumping the Sagnac interferometer with two orthogonally polarized pulses. In this case the parametrically scattered signal-idler photons yield biphoton interference with $>$90% visibility in coincidence detection, while no interference is observed in direct detection of either the signal or the idler photons.
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