We propose a scheme to generate polarization-entangled photon pairs by spontaneous parametric downconversion in a phase-modulated, type-II, quasi-phasematched (QPM) crystal. Instead of using two distinct crystals to generate |HV〉and |VH〉states, the phase-modulated QPM grating allows both states to be generated simultaneously in a distributed fashion throughout the nonlinear crystal. Temporal compensation is still needed to correct for effects of birefringence in the crystal. The distributed generation of the polarization-entangled photons is compared to generation using two sequential crystals.
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Paulina S. Kuo ; Jason S. Pelc ; Oliver Slattery ; Yong-Su Kim and Xiao Tang
Entangled photon generation in a phase-modulated, quasi-phasematched crystal
", Proc. SPIE 8875, Quantum Communications and Quantum Imaging XI, 887508 (September 26, 2013); doi:10.1117/12.2024286; http://dx.doi.org/10.1117/12.2024286