Journal
OPTICS EXPRESS
Volume 15, Issue 26, Pages 18339-18344Publisher
Optica Publishing Group
DOI: 10.1364/OE.15.018339
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We report an experimental demonstration of a bright high-fidelity single-mode-optical-fiber source of polarization-entangled photon pairs. The source takes advantage of single-mode fiber optics, highly nonlinear microstructure fiber, judicious phase-matching, and the inherent stability provided by a Sagnac interferometer. With a modest average pump power ( 300 mu W), we create all four Bell states with a detected two-photon coincidence rate of 7 kHz per bandwidth of 0.9 nm, in a spectral range of more than 20 nm. To characterize the purity of the states produced by this source, we use quantum-state tomography to reconstruct the corresponding density matrices, with fidelities of 95% or more for each Bell state. (c) 2007 Optical Society of America.
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