Telco are focusing on developing next-generation quantum cryptography In line with the development of AI and quantum computers The three mobile carriers are focusing on developing next-generation quantum cryptography technologies ahead of the commercialization of sixth-generation (6G) mobile carriers in 2030. The reason they are making efforts to develop quantum cryptography, which is a non-communications sector, is that the rapid improvement of artificial intelligence and quantum computer performance is raising the threat of destroying existing cryptography systems. Telecom companies, which suffered side-by-side from hacking last year, are showing their determination not to repeat last year's mistakes by developing next-generation quantum cryptography. According to related industries on the 4th, quantum encryption, which the three telecommunication companies are working hard to commercialize, is considered a key technology to respond to the threat that the existing encryption system could collapse due to the recent development of AI and quantum computers. Quantum cryptography (PQC) and quantum key distribution (QKD) are the core technologies of quantum cryptography. PQC is a next-generation cryptographic method designed to be difficult to decrypt even if quantum computers appear, and QKD is a technology that enables secure exchange of encryption keys necessary for data protection in a way that is virtually impossible to hack. In the future, the 6G era is expected to evolve beyond simply speeding up competition to increase network efficiency and further advance security systems through AI. The role of quantum cryptography is also becoming more important to secure the safety of 6G hyper-connected and super-intelligent services that connect AI and everything. SK Telecom has implemented a 10Gbps high-performance quantum random number generator (QRNG) on a 10×10 mm² chip and is developing an all-in-one QKD chip including a transmitter, receiver and QRNG optical system. PIC-based quantum encryption technology is expected to accelerate the spread of the technology