An ultracompact dilution refrigerator for fast quantum device characterization

• URL: http://arxiv.org/abs/2608.18699v1
• Date: Wed, 19 Aug 2026 08:54:43 GMT
• Title: An ultracompact dilution refrigerator for fast quantum device characterization
• Abstract summary: We present an ultracompact dilution refrigerator that completes a full-warm-up cycle to a base temperature of 70 mK in 1.2 hours when unloaded.<n>We validate the platform through a complete characterization of a two-fluxonium device.<n>Although the relaxation time is limited by the base temperature of the system, we reach a single-qubit gate fidelity of up to 99%.
• Score: 0.47340031544139977
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Rapid thermal cycling is a central bottleneck in the development of superconducting quantum devices: conventional dilution refrigerators require cooldowns of a day or more and substantial cryogenic infrastructure, which throttles the fabricate-measure-redesign loop. We present an ultracompact dilution refrigerator (3 kg in mass and 100 mm in diameter) that completes a full cooldown-warm-up cycle to a base temperature of 70 mK in 1.2 hours when unloaded, and in 2.1 hours when fully equipped with the microwave wiring required for qubit measurements, while delivering 20 microW of cooling power at 100 mK. We validate the platform through a complete characterization of a two-fluxonium device: we extract the full circuit Hamiltonian by two-tone spectroscopy, measure energy-relaxation and coherence times, and benchmark single-qubit control. Although the relaxation time is limited by the base temperature of the system, we reach a single-qubit gate fidelity of up to 99%, at the coherence limit set by our operating temperature. These results demonstrate that compact, fast-cycling dilution refrigeration can support state-of-the-art quantum-device characterization without sacrificing measurement quality, offering a practical route to high-throughput quantum-hardware development.

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