Quantum key disribution with unconditional security for all-optical fiber network
Osamu Hirota, Kentaro Kato, Masaki Shoma, Tsuyoshi Sasaki Usuda · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2004
Previously the present protocol was referred as Yuen-Kim second version in our papers. In this paper, it is called Yuen protocol (Y-00) and we present an efficient implementation method of physical layer of Y-00 which can support a secure communication and a quantum key distribution (more generally key expansion) by IMDD (intensity modulation/direct detection) or FSK (frequency shift keying) optical fiber communication network. Although the general proof of the security is not yet given, a brief sketch of security analysis is shown, which involve an entanglement attack.