## R&D Project

### Goal 6 R&D Projects (Selected in 2022)Development of scalable Silicon quantum computer technology

Project manager (PM)TARUCHA SeigoRIKEN Center for Emergent Matter Science and Quantum computing

#### 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, design quantum channels suitable for the quantum links, and produce large-size high-quality silicon substrates, and in addition, demonstrate the principles of quantum phase error correction.

#### Milestone by year 2025

We use high-quality substrate of silicon/silicon-germanium (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.

#### Outline of R&D

#### R&D theme structure of the project

Si qubit device and the device operation setup: control electronics and a dilution refrigerator.

#### Leader's institution

RIKEN

#### R&D institutions

RIKEN, Osaka University, Nagoya University, The University of Tokyo, Kobe University

#### PDF Download

- Summary of the project (278KB)
- Outline of R&D (437KB)