ࡱ> ;=:y RFbjbj4{{8  CCCCCWWW8  W'!'#'#'#'#'#'#'$)>,@G'CG'CCH\'^CCK !':,3^~VcF 7 r'0'R~,:~,33~,CG'G''~,  : Quantum information and its application to secure communication Yong-Su Kim*, Jiwon Yune, Sang-Wook Han, Sung Moon * HYPERLINK "mailto:yong-su.kim@kist.re.kr" \t "_blank" yong-su.kim@kist.re.kr Center for Nano & Quantum Information, Korea Institute of Science and Technology(KIST), Seoul 136-791, Rep. of Korea Quantum information is a field that embraces multiple different scientific and technological disciplines, which include mathematics, physics, electrical engineering, computer science and engineering, etc., and it has huge implications for practical applications, such as cryptographic communications, algorithmic and computational advances, and high-precision measurements and devices. As its title implies, unlike its classical counterpart, quantum information fundamentally relies on quantum characteristics of nature, for instance, the no-cloning theorem, quantum superposition, quantum entanglement, etc. The most popular application in quantum information is quantum cryptography. In short, security of a typical quantum cryptographic protocol relies on the no-cloning principle of quantum mechanics; in laymans terms, quantum information cannot be copied, and hence, a secret message between designated parties cannot be compromised. Due to the significance of secure communication, there have been many efforts to develop quantum cryptography system. In this presentation, first, I will introduce basics of quantum information such as EPR paradox, quantum measurement, etc. Then, the principle, some remarkable research of quantum cryptography will be discussed.     ?rstu9 : ; < b c 6789;<>?ABEFĹĹıhjhUh~o^h=Go(h~o^6OJQJ] h~o^o(h~o^0JOJQJh~o^jh~o^Uh~o^OJQJ^Jh~o^OJQJh~o^5CJOJQJ\aJ @s: < c 78:;=>@ACDEFgdh,dd[$\$`,gd~o^dd[$\$`gd~o^$dd[$\$a$gd~o^gd~o^21h:p`[. 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