论文标题
超导微球磁性磁线悬浮，并具有集成的磁读数
Superconducting microsphere magnetically levitated in an anharmonic potential with integrated magnetic readout
论文作者
论文摘要
磁性悬浮的超导微粒为微图对象提供了量子实验的有希望的途径。在这项工作中，我们将一个700ng $ \ sim 10^{17} $ AMU超导微球置于集成检测的磁芯片陷阱中。我们使用DC式磁力计测量粒子的质量运动。陷阱频率在30至160 Hz之间连续可调，并且在稀释冰箱环境中，粒子在几天内保持稳定。我们表征了陷阱非谐度，即非线性和模式耦合引起的动作振幅依赖频率转移。我们使用基于芯片的陷阱电位的有限元建模来解释这种非线性行为。这项工作是迈向量子实验和具有磁性超导微粒的超敏感传感器的第一步。
Magnetically levitated superconducting microparticles offer a promising path to quantum experiments with picogram to microgram objects. In this work, we levitate a 700ng $\sim 10^{17}$amu superconducting microsphere in a magnetic chip trap in which detection is integrated. We measure the particle's center-of-mass motion using a DC-SQUID magnetometer. The trap frequencies are continuously tunable between 30 and 160 Hz and the particle remains stably trapped over days in a dilution refrigerator environment. We characterize motional-amplitude-dependent frequency shifts, which arise from trap anharmonicities, namely Duffing nonlinearities and mode couplings. We explain this nonlinear behavior using finite element modelling of the chip-based trap potential. This work constitutes a first step towards quantum experiments and ultrasensitive inertial sensors with magnetically levitated superconducting microparticles.
