Optimal Generation of Pulsed Entangled Photon Pairs

Abstract

We experimentally investigate a double-pass parametric down-conversion scheme for producing pulsed, polarization-entangled photon pairs with high visibility. The amplitudes for creating photon pairs on each pass interfere to compensate for distinguishing characteristics that normally degrade two-photon visibility. The result is a high-flux source of polarization-entangled photon pulses that does not require spectral filtering. We observe quantum interference visibility of over 95% without the use of spectral filters for 200 femtosecond pulses, and up to 98.1% with 5 nm bandwidth filters.

8 pages, 6 figures

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• Joint Spectrum Mapping of Polarization Entanglement in Spontaneous Parametric Down-conversion
• Phase-stable source of polarization-entangled photons in a linear double-pass configuration
• Polarization-entangled photon-pair generation in commercial-grade polarization-maintaining fiber
• Eliminating Spectral Distinguishability in Ultrafast Spontaneous Parametric Down-conversion
• Entanglement-secured single-qubit quantum secret-sharing
• Scheme for on-chip verification of transverse mode entanglement using the electro-optic effect