Quantum cryptography – research and commercial implementations: Clavis II system (idQuantique) and EPR S405 Quelle system (AIT).
Status: unpublished. In this manuscript a short introduction to practical quantum cryptography is presented. Quantum key distribution (QKD) procedures were demonstrated with use of BB84 and E91 protocols implemented in optoelectronic applications on non-entangled photons (Clavis II system) and entangled photons (EPR S405 Quelle system). Both systems, deployed within the National Laboratory of Quantum Technologies at WUT, are analyzed for possibilities of application in telecom optic fiber networks.