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Ultralow dissipation plays an important role in sensing applications andexploring macroscopic quantum phenomena using micro-and nano-mechanicalsystems. We report a diamagnetic-levitated micro-mechanical oscillatoroperating at a low temperature of 3K with measured dissipation as low as 0.59$\mu$Hz and a quality factor as high as $2 \times 10^7$. To the best of ourknowledge the achieved dissipation is the lowest in micro- and nano-mechanicalsystems to date, orders of magnitude improvement over the reportedstate-of-the-art systems based on different principles. The cryogenicdiamagnetic-levitated oscillator described here is applicable to a wide rangeof mass, making it a good candidate for measuring both force and accelerationwith ultra-high sensitivity. By virtue of the naturally existing strongmagnetic gradient, this system has great potential in quantum spin mechanicsstudy.

Mechanical dissipation below 1$\mu$Hz with a cryogenic diamagnetic-levitated micro-oscillator