This project aims to construct a co-design model encompassing qubit design, fault-tolerant architecture, and compilers and programming languages for efficient computation through collaborations of researchers in quantum information, architecture, and specific physical systems, thereby endeavoring to realize a large-scale quantum computer by the year 2050.

This project aims to develop a quantum interface in which quantum memory is combined with an optomechanical crystal, in order to connect the superconducting qubit and the communication photon, towards realization of a large-scale superconducting quantum computer by 2050.

This project aims to develop ion trap devices that facilitate building large-scale systems beyond the limitations posed by conventional approaches. The new approach is based on a novel idea of photonically interconnecting multiple ion traps. Thereby we aim to realize large-scale quantum computing by 2050.

This project aims at the realization of large-scale fault-tolerant universal quantum computers based on a “quantum look-up table” by 2050, which work at room temperature. Here, the “quantum look-up table” is originally developed by ourselves.

This project aims to achieve large-scale integration of silicon qubits by utilizing silicon semiconductor integrated circuit technology. By 2050, we aim to achieve a large-scale quantum computer featuring high integration and low power consumption.

This project aims to develop elemental technologies for networking quantum computers with photons, atoms, semiconductors and so on, aiming to network small and medium quantum computers. We further promote networked quantum computers on a larger scale towards the achievement of universal quantum computation by 2050.

This project aims to develop hardware technologies required for scaling up the circuit of superconducting qubits in order to accelerate R&D of superconducting quantum computers. Using these technologies we aim to realize large-scale superconducting quantum computers by 2050.

This project aims to develop novel quantum-computing hardware based on nanofiber cavity QED. By 2050, we aim to develop large-scale distributed quantum-computing hardware and to realize a fault-tolerant universal quantum computer and a quantum internet.

We will implement a “dynamical qubit array” in which a large number of cold-atom qubits are assembled with optical tweezers, and each of them is moved arbitrarily and at high speed to perform gate operations as well as error detections and corrections. Furthermore, under close industry-academia collaborations, all components will be integrated and packaged to achieve unprecedentedly high stability and usability. Through these innovations, we aim to realize a fault-tolerant quantum computer that will revolutionize economy, industry, and security by 2050.

To realize an error-tolerant general-purpose quantum computer, this project addresses the technical issues of algorithms and scalable backends for classical hardware for error correction, scalable quantum-to-classical input/output frontends, semiconductor chips for backend/frontend, and cryogenic operation of optical integrated circuits for high bandwidth and low power quantum-classical input/output. Our challenge will be a technical breakthrough to implement a general-purpose fault-tolerant quantum computer by 2050.

This project aims to develop scalable technologies for 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 increasing the number of the unit structures. Based on this method we will develop fundamental technologies appropriate to implement large-scale quantum computers by 2030, and expand the technologies in cooperation with the semiconductor industry to implement universal quantum computers by 2050.

In this project, we will build a testbed for a general-purpose quantum communication network, which is a key technology for distributed large-scale quantum computers, and integrate hardware and software to demonstrate the principles and technologies of communication architectures and protocols with a view to actual operation. The results of this project will lead not only to distributed large-scale quantum computers but also to the quantum Internet, and will contribute to the realization of a world in which quantum information can be freely generated, distributed, and processed.