Scientific poster

Modelling and scaling of ADR systems for next-generation millikelvin cooling for quantum computers 

Quantum technologies, in particularly superconducting quantum computing, demand robust and scalable cooling solutions operating deep in the millikelvin regime. Adiabatic Demagnetization Refrigeration (ADR) offers a helium-3-free alternative with strong potential for modular scaling. Building on our previous demonstration of continuous ADR (cADR) operation below 30 mK in a compact rack-mounted system, the LEMON project advances the technology toward a larger-scale ADR platform targeting 20 µW at 20 mK, an order of magnitude improvement over the ~3 µW at 50 mK achieved in earlier systems. Achieving this performance requires a fundamental redesign of ADR components and a detailed understanding of their coupled behavior. 

We report on key hardware advances enabling this performance leap, including optimized thermal interfaces, improved heat switch performance, and an automated growth setup for paramagnetic refrigerant crystals. A prototype system incorporating these developments has demonstrated 20 µW of cooling power at 20 mK, validating the design approach and confirming the feasibility of scaling magnetic refrigeration to meet the demands of large-scale quantum computing infrastructure.

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