2019/04/30 There was the first awards ceremony for oustanding graduate students (2019 1st semester) by department of physics, Sogang university. [Link]
- Y. Jo was selected as one of the winners, and he presented his works at the colloquium.

Presentation title : Enhancement of security in quantum key distribution using high-dimensional quantum systems

Abstract
   In this presentation, efficient protocols for quantum key distribution which have enhanced security are investigated. These protocols exploit high-dimensional quantum states to improve security of quantum key distribution, in comparison to the conventional quantum key distribution protocols using 2-dimensional quantum states. The protocols investigated in this work provide an improved secret key rate by exploiting high-dimensional quantum systems as an information carrier, and they guarantee semi-device-independent security, which means that they can prevent a certain type of side channel attack. It is shown that these protocols allow enhanced security, not only theoretically, but also under the consideration of various experimental conditions, compared with the existing semi-device-independent quantum key distribution protocols using 2-dimensional quantum states.