9 papers
Quantum key distribution over a 2 km free-space channel with a high secure key rate
Kyungdeuk Park, Dongkyu Kim, Dong-Gil Im +4
Free-space quantum key distribution (QKD) provides crucial advantages, including mobility and deployment flexibility, for securing next-generation communication networks. However,…
Maximal coherence of quantum measurement and the resource theory of sharpness
Kyunghyun Baek, Yonggi Jo, Hyunchul Nha
A resource theory of quantum measurement can be addressed in terms of quantum coherence and measurement sharpness, respectively. The former analyzes the off-diagonal structure of P…
Spectrally engineered collinear type-0 SPDC source with enhanced spectral brightness for entanglement distribution
Dong-Gil Im, Jungmo Lee, Kyungdeuk Park +3
Entangled photon sources with high spectral brightness are important resources for photonic quantum information processing, particularly in quantum communication and quantum networ…
Robust Generation of Topological Biphoton Mode via Adiabatic Passage
Jaesung Lim, Jihwan Kim, Dong-Gil Im +4
Topological waveguide arrays support robust mode propagation in the presence of fabrication imperfections, providing a significant advantage for on-chip quantum information process…
Time-spectral control of accidental coincidences in daylight entanglement-based free-space QKD
Jiyoung Moon, Yonggi Jo, Zaeill Kim +2
Daylight entanglement-based free-space quantum key distribution (QKD) is limited by accidental coincidences from receiver-admitted background light. We develop and experimentally v…
Reconfigurable MDI-QKD and BB84 over 20 km optical channels via EOM-tailored weak coherent states
Jaesung Lim, Yonggi Jo, Nam Hun Park +2
Measurement-device-independent quantum key distribution (MDI-QKD) is designed to eliminate detector side-channel vulnerabilities. However, its practical deployment remains experime…