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Abstract
Four-wave mixing with cross-polarized pump and cross-polarized sidebands is identified as a powerful resource of quantum entanglement, enabling creation of efficient fiber-optic sources of entangled photon pairs. Generation of cross-polarized photon pairs is demonstrated by coupling the laser pump into orthogonal polarization modes of a highly birefringent, highly nonlinear, anomalously dispersive photonic-crystal fiber. With the pump wavelength set to lie deeply within the anomalous dispersion region of the fiber, the frequency offset of the photon pairs relative to the pump exceeds 45 THz, enhancing the contrast of photon pairs against the Raman noise to yield photon pairs with a coincidence-to-accidental ratio as high as 250: 1.
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