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Publication Citation: Quantum state tomography of a fiber-based source of polarization-entangled photon pairs

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Author(s): Jingyun Fan; M D. Eisaman; Alan L. Migdall;
Title: Quantum state tomography of a fiber-based source of polarization-entangled photon pairs
Published: December 20, 2007
Abstract: We report an experimental demonstration of a bright highfidelity 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 μW), 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.
Citation: Optics Express
Volume: 15
Pages: pp. 18339 - 18344
Keywords: accidental;bell state;coincidene;four-wave mixing;Raman scattering;Sagnac interferometer;tomography
Research Areas: Entanglement, Quantum Optics, Quantum Information, Single Photon Detectors, Entangled Photons, Quantum Devices, Single Photon Sources, Squeezing, Correlated Photon Radiometry, Quantum Information Technology
PDF version: PDF Document Click here to retrieve PDF version of paper (358KB)