论文标题
在Millikelvin温度下的高Q磁悬浮和控制微球
High-Q magnetic levitation and control of superconducting microspheres at millikelvin temperatures
论文作者
论文摘要
我们报告了在抗螺旋型构型中，由两个线圈形成的静态磁陷阱中的超导铅锡球的悬浮铅锡球在静态磁性陷阱中的悬浮液（对应于5.6微克），具有可调节的谐振频率，高达240 Hertz。使用直流超导量子干扰装置以及光学上的磁性监测球体的质量运动，并显示高达2.6E7的质量因子。我们还展示了球体运动的3D磁反馈控制。该设置安装在15毫米毫米运行的稀释冰箱中。通过实施低温振动隔离系统，我们可以在200 HERTZ处衰减环境振动，大约七个数量级。低温，大质量和高质量因子以及可调节的共振频率的组合为测试量子物理学的有前途的平台，以在先前未开发的质量和较长连贯时期的量子物理中进行测试。
We report the levitation of a superconducting lead-tin sphere with 100 micrometer diameter (corresponding to a mass of 5.6 micrograms) in a static magnetic trap formed by two coils in an anti-Helmholtz configuration, with adjustable resonance frequencies up to 240 hertz. The center-of-mass motion of the sphere is monitored magnetically using a dc superconducting quantum interference device as well as optically and exhibits quality factors of up to 2.6e7. We also demonstrate 3D magnetic feedback control of the sphere's motion. The setup is housed in a dilution refrigerator operating at 15 millikelvin. By implementing a cryogenic vibration isolation system we can attenuate environmental vibrations at 200 hertz by approximately seven orders of magnitude. The combination of low temperature, large mass and high quality factor as well as adjustable resonance frequencies provides a promising platform for testing quantum physics in previously unexplored regimes with high mass and long coherence times.
