Coherent receiver architectures for secure key distribution using faint optical multilevel signals
Sebastian Kleis, Reinhold Herschel, Christian G. Schaeffer · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2015
Optical multilevel signals for QKD are evaluated in terms of security and key generation rate when they are used with post-selection. Potential receiver architectures are analyzed from a quantum-mechanical point of view and compared regarding these parameters as well as implementation complexity. Based on that, a coherent state QKD system is proposed.