Fiber-Optic Sources of Quantum Entanglement
Abstract
We present a fiber-based source of polarization-entangled photon pairs that is well suited for quantum communication applications in the 1.5μm 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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