We have developed two modular dilution refrigerators with a cooling power on the order of 1 mW at 100 mK and $20\mathrm{\mu }\mathrm{W}$ at 20 mK, and further carried out joint operation by integrating the two modular units. In the integrated configuration, the base temperatures of the mixing chamber cold plates of both refrigerators remained below 10 mK and within the same temperature range; the combined cooling power essentially doubles that of a single module. In this way, a concurrent increase in both cooling power and available experimental space has been realized through the implementation of the modular integration, and the integrated prototype is already being used to conduct superconducting quantum computing experiments. We experimentally verified that, under integrated operation, the load condition of one module has only a negligible effect on the temperature and cooling power of the other refrigerator, demonstrating a certain degree of independence between the two modular units. Finally, we also point out the challenges that the proposed modular integration scheme may face in its further evolution and suggest possible improvement approaches. This study provides a reference for the future development and application of high-cooling power dilution refrigerators. The scalability demonstrated in cooling power and experimental space is expected to offer solutions for future large-scale quantum computing applications.

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• Cryogenic technology
• Energy-efficient industry
• Heat transfer
• Quantum information with solid state qubits
• Superconducting qubits
• Dilution refrigerator