Summary of the project

This R&D project aims to realize a large-scale "Fault-Tolerant Networked Quantum Computer" by developing networking technologies that establish quantum interconnects between multiple small/medium-scale quantum processors. To achieve the "Fault-Tolerant Universal Quantum Computer" targeted by Goal 6, it is estimated that quantum processors capable of handling one million qubits are required. However, because realizing this within a single processor remains a significant challenge, it is essential to network multiple modular quantum processors. Our project focuses on atoms and ions as the hardware platform and develops photon-based networking technologies. Atoms and ions can generate photons and create entanglement with them; by leveraging this property, we can establish entanglement between remote quantum processors. Through this entanglement, distant processors are quantum-connected and operate as a single, unified, large-scale quantum processor. For such a system to be "fault-tolerant," each individual processor must be capable of handling error-correctable logical qubits, each composed of more than 1,000 physical qubits. Consequently, our milestone is to establish entanglement between the logical qubits of remote processors to realize a fully functional Fault-Tolerant Networked Quantum Computer.

Milestone by year 2030

In collaboration with atom/ion-based quantum hardware projects, we achieve “logical entanglement distribution” between distant processors. This milestone aims to establish the core infrastructure for networked quantum computing, paving the way for million-qubit systems by 2050.

Milestone by year 2028

To achieve the milestone by 2030, we will develop “entanglement multiplexing communication technology” to establish entanglement between logical qubits composed of numerous physical qubits.

Performers

PDF Download

• Summary of the project (247 KB)