Multi-Layered Asymmetric Waveguide Structure for Gain-Chip and its Application to Polymer-Based Waveguide Grating for High Power Tunable Laser. - Dong Churl Kim; Dong-Hoon Lee 008; Young-Tak Han; Byung-Seok Choi; Sang-Ho Park; Jang-Uk Shin; Won-Seok Han; Yong-Hwan Kwon; Jong-Hoi Kim; Yongsoon Baek (ECOC, 2017)

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)

Controllable Passive Multi-polarization-states Generator based on Silicon Photonics for Quantum Communication. - Kap-Joong Kim; Kyongchun Lim; Byung-Seok Choi; Wook-Jae Lee; Young-Ho Ko; Joong-Seon Choe; Minchul Kim; Jong-Bum You; Chun Ju Youn (OFC, 2023)

Demonstration of Reference Frame Independent Quantum Key Distribution with Integrated Optical Circuits. - Kyongchun Lim; Byung-Seok Choi; Joong-Seon Choe; Ju Hee Baek; Minchul Kim; Kap-Joong Kim; Chun Ju Youn (OFC, 2023)

Stand-alone 3C-SiC-based Single-photon Source modules for Quantum Key Distribution. - Byung-Seok Choi; Ju Hee Baek; Kap-Joong Kim; Joong-Seon Choe; Kyongchun Lim; Minchul Kim; Chun Ju Youn (OFC, 2024)

Photonic Integrated Chip-based Reference Frame Independent Quantum Key Distribution Transmitter. - Kyongchun Lim; Byung-Seok Choi; Ju Hee Baek; Minchul Kim; Joong-Seon Choe; Kap-Joong Kim; Dong Churl Kim; Junsang Oh; Chun Ju Youn (OFC, 2025)