Ultralow dissipation plays an important role in sensing applications and exploring macroscopic quantum phenomena using micro-and nano-mechanical systems. We report a diamagnetic-levitated micro-mechanical oscillator operating at a low temperature of 3K with measured dissipation as low as 0.59 μHz and a quality factor as high as 2×107. To the best of our knowledge the achieved dissipation is the lowest in micro- and nano-mechanical systems to date, orders of magnitude improvement over the reported state-of-the-art systems based on different principles. The cryogenic diamagnetic-levitated oscillator described here is applicable to a wide range of mass, making it a good candidate for measuring both force and acceleration with ultra-high sensitivity. By virtue of the naturally existing strong magnetic gradient, this system has great potential in quantum spin mechanics study.
@article{arxiv.2008.07940,
title = {Mechanical dissipation below 1$\mu$Hz with a cryogenic diamagnetic-levitated micro-oscillator},
author = {Yingchun Leng and Rui Li and Xi Kong and Han Xie and Di Zheng and Peiran Yin and Fang Xiong and Tong Wu and Chang Kui Duan and Youwei Du and Zhang qi Yin and Pu Huang and Jiangfeng Du},
journal= {arXiv preprint arXiv:2008.07940},
year = {2021}
}