KT, which introduced quantum cryptographic key distribution equipment capable of generating 150,000 keys per second (150kbps) in early 2024, has more than doubled its generation rate in a year and a half.
KT announced Wednesday that it has independently developed quantum cryptographic key distribution equipment capable of generating 300,000 keys per second (300kbps). Quantum key distribution equipment uses quantum mechanical properties that make cryptographic key duplication impossible, fundamentally blocking eavesdropping signals on physical lines.
KT's quantum cryptographic communication technology represents the fastest speed among quantum key distribution systems made with domestic technology and matches the performance of global manufacturers. When deployed in communication networks, the equipment can provide quantum cryptographic keys to more than 70,000 encryption devices per minute.
Quantum key distribution systems handle single photons, the smallest unit of light energy, making quantum states susceptible to collapse when dispersion or scattering occurs due to light characteristics. To address this, KT developed error-reduction filters and systems to increase key generation speed. By minimizing errors and generating and detecting quantum states at desired moments through these filters and systems, key generation speed can be increased while improving system performance and reliability.
KT conducted technology verification with domestic quantum cryptographic communication technology development and certification organizations late last year, including the Telecommunications Technology Association (TTA), the Electronics and Telecommunications Research Institute (ETRI), and the National Information Society Agency (NIA). The company also conducted joint verification with the research team of Professor Heo Jun at Korea University's Communication and Information Systems Laboratory, which specializes in quantum cryptographic communication technology. The error-reduction filters and systems are expected to be utilized in quantum internet, the next-generation network.
