Superconducting microsphere magnetically levitated in an anharmonic potential with integrated magnetic readout

• URL: http://arxiv.org/abs/2210.13451v3
• Date: Thu, 1 Jun 2023 21:02:56 GMT
• Title: Superconducting microsphere magnetically levitated in an anharmonic potential with integrated magnetic readout
• Authors: Mart\'i Gutierrez Latorre and Gerard Higgins and Achintya Paradkar and Thilo Bauch and Witlef Wieczorek
• Abstract summary: We levitate a 700ng $sim 1017$amu superconducting microsphere in a magnetic chip trap. We measure the particle's center-of-mass motion using a DC-SQUID magnetometer. We characterize motional-amplitude-dependent frequency shifts, which arise from trap anharmonicities.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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