Computers and communication networks are part of an infrastructure that has become indispensable in our everyday lives, and advancements in those areas are presenting interesting possibilities for further evolution in coming societies. Light, which has its own unique features such as hyper-parallelism and ultra-fast speed, occupies a key position in advances being made in information and communications technology. Hamamatsu Photonics is developing devices and systems that utilize the characteristics of light to the utmost limit as we take on the challenge of creating optical computers, quantum computers and even "thinking computers" that can be realized by finding solutions to complex systems.