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윤천주,고해신,김갑중,최병석,최중선,Youn, C.J.,Ko, H.,Kim, K.J.,Choi, B.S.,Choe, J.S. 한국전자통신연구원 2018 전자통신동향분석 Vol.33 No.6
A quantum key distribution (QKD) provides in principle an unconditional secure communication unlike the standard public key cryptography depending on the computational complexity. In particular, free-space QKD can give a secure solution even without a fiber-based infrastructure. In this paper, we investigate an overview of recent research trends in the free-space QKD system, including satellite and handheld moving platforms. In addition, we show the key components for a free-space QKD system such as the integrated components, single photon detectors, and quantum random number generator. We discuss the technical challenges and progress toward a future free- space QKD system and components.