Spectral characterization of SPDC-based single-photon sources for quantum key distributionSabine Euler, Erik Fitzke, Oleg Nikiforov, Daniel Hofmann, Till Dolejsky and Thomas WaltherEur. Phys. J. Spec. Top., 230 4 (2021) 1073-1080DOI: https://doi.org/10.1140/epjs/s11734-021-00081-5