Summary of the project

This project aims to develop scalable multi-qubit devices toward realization of Silicon quantum computer. We will use sparse integration and medium-distance quantum coupling to implement a unit structure of qubits and scale up the qubit system by integrating the unit structures. Based on this method we will develop technology bases appropriate to implement large-scale quantum computers by 2030, and expand them in cooperation with the semiconductor industry to realize universal quantum computers by 2050.

Milestone by year 2030

We establish technology bases for fabricating multi-qubit devices toward development of large-scale quantum computers in cooperation with semiconductor industries. In parallel, we perform characterization and high-fidelity quantum operation of the multi-qubit devices, development of quantum channels suitable for connecting distant qubits, and production of isotopically enriched silicon/silicon-germanium (Si/SiGe) substrate, and in addition, demonstration of the principle of quantum error correction.

Milestone by year 2025

We use high-quality substrate of Si/SiGe to establish fabrication technologies for implementing multi-qubit devices with a one-dimensional qubit array as a fundamental structure, and use them to construct a prototype of small- to middle-scale quantum computers. In addition, we inspect new principles for quantum gate circuits constructed by electron wave packets as propagating qubits.

R&D theme progress reports

• [1] Development of scalable fault-tolerant Si qubit devices
• [2] Development of middle-distance quantum link
• [3] Development of isotopically controlled Si/SiGe substrate technology
• [4] Development of electron wave-packet qubits with new principle
• Progress Report (967KB)

Performers

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• Summary of the project (278KB)