A microkelvin cryogen-free experimental platform with integrated noise thermometry

Abstract

We report experimental demonstration of the feasibility of reaching temperatures below 1 mK using cryogen-free technology. Our prototype system comprises an adiabatic nuclear demagnetisation stage, based on hyperfine-enhanced nuclear magnetic cooling, integrated with a commercial cryogen-free dilution refrigerator and 8 T superconducting magnet. Thermometry was provided by a current-sensing noise thermometer. The minimum temperature achieved at the experimental platform was 600 μK. The platform remained below 1 mK for over 24 hours, indicating a total residual heat-leak into the experimental stage of 5 nW. We discuss straightforward improvements to the design of the current prototype that are expected to lead to enhanced performance. This opens the way to widening the accessibility of temperatures in the microkelvin regime, of potential importance in the application of strongly correlated electron states in nanodevices to quantum computing.

11 pages, 4 figures

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• Current Sensing Noise Thermometry: A fast practical solution to low temperature measurement
• Cooling low-dimensional electron systems into the microkelvin regime
• Magnetic cooling for microkelvin nanoelectronics on a cryofree platform
• Low-temperature environments for quantum computation and quantum simulation
• Self assembled Wigner crystals as mediators of spin currents and quantum information
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• Isolation solution for extreme environmental vibrations for quantum-enabling cryogenic setups installed on raised frames
• A Sub-kHz Mechanical Resonator Passively Cooled to 6 mK