PPLN waveguide for quantum communicationS. Tanzilli, W. Tittel, H. De Riedmatten, H. Zbinden, P. Baldi, M. De Micheli, D. B. Ostrowsky and N. GisinEur. Phys. J. D, 18 2 (2002) 155-160DOI: https://doi.org/10.1140/epjd/e20020019