NTT

NTT (Nippon Telegraph and Telephone) develops quantum networking and quantum computing services through their quantum research programs, focusing on quantum communication networks, quantum key distribution systems, and quantum internet infrastructure while conducting research in quantum computing technologies, providing quantum-safe communication services and developing quantum network protocols to enable secure quantum communications and distributed quantum computing applications across Japan's telecommunications infrastructure.

November 2025: NTT launched OptQC (Optical Quantum Computing) initiative with Fujitsu and other Japanese partners to develop room-temperature optical quantum computers. The OptQC consortium targets practical optical quantum computing systems leveraging Japan's photonics expertise. NTT's quantum research demonstrates continuous-variable quantum computing advances.

2025 Developments: Expanded IOWN (Innovative Optical and Wireless Network) initiative with quantum-secured communications integration. Advanced quantum repeater research for long-distance quantum networks. Participated in Japan's national quantum technology strategy implementation.