Abstract
We numerically study a narrowband semiconductor integrated source of counterpropagating twin photons for line-of-sight experiments in quantum key distribution. Considering the air transparency and the availability of silicon avalanche photodiodes to be around 770 nm, we focus on GaN- and ZnSe-based quadratically nonlinear multilayer waveguides. The design of a quasi-phase-matched profile in the growth direction allows us to generate guided photon pairs per second for a pump power around 300 mW.
© 2005 Optical Society of America
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