KDDI Corp (KDDI) is a provider of telecommunication services. The company offers mobile and fixed-line broadband services such as fiber to the home (FTTH) services and community access television (CATV) services. It also offers value-added services, solution services, and global services. KDDI serves both individual and corporate customers in Japan and overseas markets, with focus on regions in Asia such as Myanmar and Mongolia. The company also offers solution services, which fundamentally consist of equipment sales, engineering, and management services. KDDI's global services include solution services, data center services, and mobile telephone services. It also offers cloud services, IoT services, security services and managed services.

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KDDI's focuses on 5G communications, data-driven technologies, and generative AI as core areas, with digital transformation and energy driving growth, and mobility and space challenging new growth. The company is engaged in R&D activities to support these areas, including developing Beyond 5G/6G technologies, AI-driven network management, and large-scale language models. Additionally, KDDI Corp is working on decarbonization initiatives, autonomous mobility technologies, and space-related business co-creation. The company is also exploring future technologies like quantum computing and post-quantum encryption. The R&D unit of KDDI Corp is the Advanced Technology Headquarters, which is responsible for formulating R&D strategies and promoting business models in the advanced technology field. The company entered into a partnership with Jij Inc., and Waseda University for the technological development and commercialization of quantum computers. The company also plans to develop an AI/quantum common business platform that seamlessly connects AI and quantum computing, and will explore use cases utilizing this platform. In FY2025, the company incurred an expense of JPY37,333 million, which stood at 0.6% of company's total revenue.