Enhancing the purity of single photons in parametric down-conversion through simultaneous pump-beam and crystal-domain engineering

Baghdasar Baghdasaryan, Fabian Steinlechner, Stephan Fritzsche

Spontaneous parametric down-conversion (SPDC) has shown great promise in the generation of pure and indistinguishable single photons. Photon pairs produced in bulk crystals are hig…