Optimal focusing for maximal collection of entangled narrow-band photon pairs into single-mode fibers
Optimal focusing for maximal collection of entangled narrow-band photon pairs into single-mode fibers
We present a theoretical and experimental investigation of the emission characteristics and the flux of photon pairs generated by spontaneous parametric downconversion in quasi-phase matched bulk crystals for the use in quantum communication sources. We show that, by careful design, one can attain well defined modes close to the fundamental …