Informatic analysis for hidden pulse attack exploiting spectral characteristics of optics in plug-and-play quantum key distribution system. - Heasin Ko; Kyongchun Lim; Junsang Oh; June-Koo Kevin Rhee (Quantum Inf. Process., 2016)

Integrated Polarization Beam Splitter Module for Polarization-Encoded Free-Space BB84 QKD. - Joong-Seon Choe; Heasin Ko; Byung-Seok Choi; Kap-Joong Kim; Chun Ju Youn (OFC, 2018)

Advanced unambiguous state discrimination attack and countermeasure strategy in a practical B92 QKD system. - Heasin Ko; Byung-Seok Choi; Joong-Seon Choe; Chun Ju Youn (Quantum Inf. Process., 2018)

Daylight Operation of a High-Speed Free-Space Quantum Key Distribution using Silica-Based Integration Chip and Micro-Optics-Based Module. - Heasin Ko; Joong-Seon Choe; Byung-Seok Choi; Kap-Joong Kim; Jong-Hoi Kim; Yongsoon Baek; Chun Ju Youn (OFC, 2019)