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Activated on July 28, 2025, at the University of Osaka's Center for Quantum Information and Quantum Biology (QIQB), this groundbreaking system marks a pivotal moment in Japan's technological journey. The computer, powered by the open-source OQTOPUS toolchain, is entirely built with Japanese components, highlighting the nation's commitment to technological sovereignty and global collaboration. This development not only underscores Japan's capabilities in advanced technology but also positions it at the forefront of the quantum revolution.
The technical breakdown: A domestic marvel
The heart of this quantum computer lies in its quantum processing unit (QPU), which uses superconducting qubits. These qubits are derived from metals that exhibit zero electrical resistance when cooled to temperatures close to absolute zero (minus 459.67 degrees Fahrenheit or minus 273.15 degrees Celsius). The QPU was developed at RIKEN, one of Japan's leading research institutes.
Other key components include:
Chip Package: Delivered by Seiken
Magnetic Shield: To protect the system from external magnetic interference
Infrared Filters: To reduce noise and improve signal quality
Bandpass Filters: To ensure only the desired signals are processed
Low-Noise Amplifier: To amplify signals without introducing significant noise
Specialized Cables: To connect various components
All these elements are housed in a dilution refrigerator, a specialized cryogenic device that maintains the ultra-low temperatures necessary for superconducting quantum computing. The system also includes a pulse tube refrigerator, controllers and a low-noise power source, further enhancing its stability and performance.
Open source OQTOPUS: The software backbone
One of the most significant aspects of this quantum computer is the open-source software toolchain, OQTOPUS (Open Quantum Toolchain for Operators and Users). OQTOPUS is a collection of open-source tools designed to run quantum programs and includes:
Core Engine: The main processing unit for quantum computations
Cloud Module: Enables remote access and cloud-based quantum computing
Graphical User Interface (GUI): Provides an intuitive interface for users to interact with the system