| （英） |
Part of experimental researches on quantum key distribution (QKD) has gone beyond the phase of basic researches, and now it is in the phase of development of the systems. In the first part of the talk, we would like to introduce Tokyo QKD network as an example of such system development. As for the theory of QKD, it is a hot topic to work on how to make sure the security of actual QKD systems. The security of QKD depends on whether the QKD systems operate as the theory requires or not. Unfortunately, however, the requirements are not perfectly met in practice, and there is usually a gap between the theory and the QKD systems. In the second part of the talk, we introduce recent researches aiming at filling this gap. |