Our project is developing a quantum computer using silicon electron spin qubits, and in particular, a large-scale silicon quantum computer utilizing silicon semiconductor integrated circuit technology. Currently, the development of quantum computers is dominated by a bottom-up approach that prioritizes "quality" and increases the number of qubits one by one. In contrast, we are taking a top-down approach, taking advantage of the silicon semiconductor technology (which enables the implementation of a large number of qubits with uniform characteristics) to promote a system design that focuses on "quantity" from the beginning. We will also develop various technologies made possible by the silicon semiconductor technology to improve the "quality" of the system as a whole and achieve a fault-tolerant universal quantum computer.
We are developing a large-scale silicon quantum computer utilizing silicon semiconductor integrated circuit technology. We have designated three challenges in this R&D theme.
We are responsible for cryogenic circuit mounting technology for large-scale integration of silicon quantum computers. The achievement of this R&D theme will enable high-precision control and high-density packaging of a large number of silicon qubits, and will contribute to the development of a large-scale silicon quantum computer, which is the goal of the project, and to the realization of a fault-tolerant universal quantum computer, which is the goal of Moonshot Goal 6.
We aim to achieve high temperature operation qubits (hot silicon qubits) using silicon qubit systems. One of the challenges in realizing hot silicon qubits is that the retention time of quantum information decreases as the temperature rises. In order to break through this common sense, we are challenging to find the sweet spot where the quantum information retention time reaches its maximum value, based on the deep exploration and clarification of unexplored physics.
In parallel with the development of a large-scale silicon qubit array structure, we aim to quickly identify issues for the realization of a quantum computer by utilizing small-scale experimental circuits that will form part of the array structure in the future. This will provide design guidelines for the large-scale array structure that the project is aiming for, as well as clarify the feasibility of the elemental technologies required for the fault-tolerant universal quantum computer that Moonshot Goal 6 is aiming for.
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