A milligram superconducting levitating oscillator at millikelvin temperatures achieves ring-down time exceeding 110 hours and resonance linewidth below 0.8 μHz, demonstrated via femtonewton-scale drag measurements from 3He in superfluid 4He.
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A Superconducting Levitating Oscillator with < 1 $\mu$Hz Resonance Linewidth
A milligram superconducting levitating oscillator at millikelvin temperatures achieves ring-down time exceeding 110 hours and resonance linewidth below 0.8 μHz, demonstrated via femtonewton-scale drag measurements from 3He in superfluid 4He.