2010 Volume 79 Issue 2 Pages 104-111
Quantum cryptography is a technology that ensures ultimate security on the basis of fundamental physical laws. Among the various quantum information technologies, the most extensive research is being conducted on quantum cryptography, including the development of experimental equipment, field tests carried out over distances of about 100 km, and discussions on newly proposed theoretical schemes. Progress in theoretical research is also continuing, including the proposal of a new quantum key distribution (QKD) scheme. This scheme, which involves a decoy protocol, can achieve an unconditional security using a weak laser. This article outlines the basic idea of QKD, domestic and overseas trends in research and development on quantum cryptography, recent topics and current efforts toward its practical application. Analysis of the security of quantum cryptography is also discussed.
