Generating polarization-entangled photon pairs using cross-spliced birefringent fibers

Abstract

We demonstrate a novel polarization-entangled photon-pair source based on standard birefringent polarization-maintaining optical fiber. The source consists of two stretches of fiber spliced together with perpendicular polarization axes, and has the potential to be fully fiber-based, with all bulk optics replaced with in-fiber equivalents. By modelling the temporal walk-off in the fibers, we implement compensation necessary for the photon creation processes in the two stretches of fiber to be indistinguishable. Our source subsequently produces a high quality entangled state having (92.2 \pm 0.2) % fidelity with a maximally entangled Bell state.

5 pages, 5 figures, updated to published version

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• Polarization-entangled photon-pair generation in commercial-grade polarization-maintaining fiber
• Photon pair generation by intermodal spontaneous four wave mixing in birefringent, weakly guiding optical fibers
• Configurable spatio-temporal properties in a photon-pair source based on spontaneous four wave mixing with multiple transverse modes
• Generation of 1.5 μm discrete frequency entangled two-photon state in polarization maintaining fibers
• Crossed crystal scheme for fs-pulsed entangled photon generation in ppKTP
• Quantum communication improved by spectral entanglement and supplementary chromatic dispersion
• Spatio-Spectral Quantum State Estimation of Photon Pairs from Optical Fiber Using Stimulated Emission