A Sub-kHz Mechanical Resonator Passively Cooled to 6 mK

• URL: http://arxiv.org/abs/2510.24199v1
• Date: Tue, 28 Oct 2025 09:04:47 GMT
• Title: A Sub-kHz Mechanical Resonator Passively Cooled to 6 mK
• Authors: Loek van Everdingen, Jaimy Plugge, Tim Fuchs, Guido van de Stolpe, Dalal Benali, Thijmen de Jong, Jasper Bijl, Wim Bosch, Tjerk Oosterkamp,
• Abstract summary: We study a 700 Hz, massive (1.5 ng) mechanical cantilever cooled to 6.1(4)mK by means of nuclear demagnetization.<n>At the lowest temperatures the thermal motion of the resonator is still clearly distinguishable from the background noise.<n>These results pave the way for passiveof cooling low-frequency resonators to the sub-milllikelvin regime.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Fundamental tests of quantum mechanics, such as the generation of non-classical states and tests of wavefunction collapse models, are performed on increasingly larger size and mass scales. Highly coherent mechanical resonators, which also prove invaluable in ultrasensitive microscopy methods, are essential tools towards these efforts. Studying these resonators in a thermal equilibrium state at millikelvin temperatures provides a promising path to increase their coherence time. Here, we passively cool a 700 Hz, massive (1.5 ng) mechanical cantilever down to 6.1(4)mK by means of nuclear demagnetization, as confirmed by detecting its thermal motion via a lock-in based detection scheme. At the lowest temperatures the thermal motion of the resonator is still clearly distinguishable from the background noise. Our data analysis confirms that at these temperatures the motion is still thermally distributed. These results pave the way for passiveof cooling low-frequency resonators to the sub-milllikelvin regime, which would enable new tests of quantum mechanics and advances in ultrasensitive force detection.

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