Summary of the project

This project aims to develop an integrated system of quantum computer and quantum communication to realize a large-scale distributed quantum computer with fault-tolerance. For this purpose, we will develop a quantum interface that connects superconducting quantum computer chips via optical fiber quantum communication (Fig. 1). For the quantum interface to operate in cryogenic environments, it must be driven by pump light with a power >10 orders of magnitude lower than that of conventional systems. We develop the entire process from diamond growth and nanofabrication to 3D implementation, with the core technologies; a quantum memory to mediate the microwave band photons output from the superconducting qubit and the optical band photons output from the optical fiber, and a nanostructured optomechanical (photonic + phononic) crystal resonator to enhance the interaction (Fig. 2).

Milestone by year 2030

Establish a fundamental technology for fault-tolerant quantum computer networks by realizing hybrid quantum interfaces and large-capacity quantum buses that dramatically improve conversion efficiency through the hybrid implementation of nanostructured photonic/phononic resonators and diamond color centers.

Milestone by year 2025

To show that the number of qubits can be expanded to the scale needed for quantum error correction, we will realize a connection between quantum computers via quantum communication using a hybrid quantum interface (Fig. 1).

R&D theme progress reports

• [1] Diamond Quantum Memory
• [2] Optomechanical Cavity
• [3] Piezoelectric Microwave Cavity
• Progress Report (793KB)

Performers

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• Summary of the project (359KB)