5 papers · 1 filter
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,…
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…
Optimizing brightness of SPDC source in Laguerre-Gaussian modes using type-0 periodically-poled nonlinear crystal
Jungmo Lee, Kyungdeuk Park, Dongkyu Kim +3
Photon pairs generated via spontaneous parametric down-conversion (SPDC) can exhibit entanglement in the Laguerre-Gaussian (LG) mode basis, which enables high-dimensional free-spac…
Ultrabright fiber-coupled ploarization-entangled photon source with spectral brightness surpassing 2.0 MHz/mW/nm
Kyungdeuk Park, Jungmo Lee, Dong-Gil Im +2
We present an ultrabright polarization-entangled photon source that is optimally coupled into single-mode fibers (SMFs). This study theoretically and experimentally examines the ch…