This research is positioned as one of the projects under MOONSHOT Goal 6 "Realization of a fault-tolerant universal quantum computer that will revolutionize the economy, industry, and security by 2050". To achieve this goal we are collaborating with various research organizations.
Challenges of scaling up towards a fault-tolerant universal quantum computer
Just as modern computers network modules to achieve large scale, networking is also necessary for large-scale quantum computers. We are developing quantum networking technology to achieve this large scale.
The potential of cyberspace in the age of quantum computers
A network of quantum computers will create a cyberspace. This quantum cyberspace will provide a level of security that not even quantum computers can overcome and it will offer advanced computational and precision measurement capabilities. The quantum cyberspace will have the potential to create unimaginable applications. We will discover this possibility.
R&D theme 1
Atom network-type technology
In this research subject, we will develop a quantum interface to network atom-based quantum computers composed of naturally existing atoms as qubits, such as those in the periodic table. We will also develop optical routing technology and other elemental technologies to increase the scale of various quantum computers.
In this research subject, we will work to develop a multiplexed superconducting nanowire photon detector (SNSPD) system as an elemental technology for networking quantum computers. The developed photon detection system will be utilized within the project and in conjunction with other projects.
In this research subject, we will work on developing technologies to improve the performance of photon detectors as an elemental technology for networking quantum computers. We will pursue high efficiency and low dark count beyond the performance of current superconducting nanowire photon detectors (SNSPD).
R&D theme 2
Photon network-type technology
In this research subject, we will develop a photon networking technology based on nanofiber resonator QED with the aim of realizing quantum computers with photon qubits that have high coherence and do not lose their quantum properties even at room temperature. In particular, we will pursue photon qubit generation technology and photon cluster state generation technology.
R&D theme 3
Semiconductor qubit networking technology
In this research subject, we will develop an elemental networking technology for large-scale semiconductor quantum computers using the spin of electrons and holes in semiconductor quantum dots as qubits. To this end, we will work on research and development of quantum interface technology for photons and silicon qubits and inter quantum coupling technology for silicon qubits.
R&D theme 4
Superconductor network-type technology
In this research subject, we will develop elemental networking technology for large-scale quantum computers with superconducting qubits operating at microwave frequencies at cryogenic temperatures. To this end, we will work on research and development of a quantum interface (transducer) to convert microwaves from superconducting qubits into photons.