4/Quantum Computing in Small Qubit Systems

Our goal is to develop a method for efficiently computing silicon qubits. In advancing development, we will utilize basic "small-scale experimental circuits" that form part of a qubit array structure to identify early issues for realizing quantum operations with silicon qubits. Exploration of qubit array structures and control methods that can effectively incorporate basic operations such as initialization, readout, bit operations, and bit connectivity will be conducted. The knowledge obtained will be reflected in the 2D qubit array structure that will be developed in R&D theme 1, "2D qubit array". In addition, we will investigate qubit control methods to efficiently perform quantum operations in the two-dimensional qubit array structure to achieve our goal of quantum computation. Through the implementation of small-scale quantum circuits, we will promote research to identify issues for further scaling up.

R&D Challenge

• 7. Compatibility of arrayed and basic qubit operations

  By utilizing "small-scale experimental circuits" that form part of a qubit array structure, we aim to formulate guidelines for solving issues that are expected to emerge in qubit array structures when performing qubit fundamental operations. When a qubit structure is arrayed, there are restrictions on how to perform basic qubit operations such as initialization, readout, and quantum state control. We will extract these constraints and perform basic evaluations of the guideline for solving them by utilizing "small-scale experimental circuits" to verify a method that is compatible with qubit arraying and qubit fundamental operations. In close collaboration with R&D theme 1, "2D qubit array," we will search for structures suitable for large-scale integration, including alternative designs for silicon 2D qubit arrays.

• 8. Verification of quantum controllability of qubits

  In cooperation with R&D Challenge 7 " Compatibility of arrayed and basic qubit operations," we will develop a method for efficient operation of silicon qubits. In the development process, we will utilize basic "small-scale experimental circuits" that form part of the qubit array structure to identify early issues for realizing quantum computation with silicon qubits. Based on our knowledge in high-fidelity control of a small number of qubits, we will examine the qubit control methods necessary to perform practical quantum operations with a two-dimensional qubit array structure.

• Related Links Development of scalable Silicon quantum computer technology
• List of research results " Quantum Computing in Small Qubit Systems "