Japan Launches the World's Most “Dense” Quantum Computer: 256 Qubits

Japanese specialists from the research agency RIKEN, together with Fujitsu, have introduced one of the world’s largest superconducting quantum computers. The new system contains 256 qubits — a record in qubit density: the number of qubits was increased fourfold without enlarging the device’s size.

Key features:

• Utilizes a 3D architecture based on 4-qubit cells

• Operating temperature: 20 mK (close to absolute zero)

• Amplifier energy consumption reduced by more than 60%

• High density of cable connections

Fujitsu plans to create a 1000-qubit quantum computer by 2026. In the long term, the industry aims for systems with a million qubits, which are necessary for solving real-world problems such as cryptanalysis and new material simulations.

Today, the new 256-qubit system is already accessible via a cloud platform. Among the first users are companies from Japan’s financial and chemical sectors. International cooperation is expected to expand.