Superconducting Microsphere Magnetically Levitated in an Anharmonic Potential with Integrated Magnetic Readout

Latorre, Mercedes Alfaro; Higgins, Gerard; Paradkar, Achintya; Wieczorek, Witlef

doi:10.1103/physrevapplied.19.054047

Phys. Rev. Applied

2023

DOI: 10.1103/physrevapplied.19.054047

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Superconducting Microsphere Magnetically Levitated in an Anharmonic Potential with Integrated Magnetic Readout

Mercedes Alfaro Latorre

Gerard Higgins

Achintya Paradkar

et al.

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Cited by 12 publications

References 71 publications

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Characterizing low-frequency vibratory motion with radio-frequency cavities

Hart-Alesch,

Sharping

2024

Journal of Applied Physics

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Radio-frequency (RF) cavities, previously employed in particle physics, quantum computing, and gravitational wave research, offer unique advantages in terms of sensitivity and non-invasiveness as a method of sensing motion in both macroscopic and microscopic systems. This research aims to address how an RF cavity can effectively detect and characterize the low-frequency vibratory motion of a room-temperature mm-scale levitated particle. In this case, the particle in question is a diamagnetically levitated slab of highly oriented pyrolytic graphite. Cavity-based identification of the slab’s rigid-body modes is substantiated by calculations of the force acting on the particle and validated through slow-motion video object tracking. We find that this system can accurately measure oscillations in all six center-of-mass degrees of freedom. Calculations indicate that this system could potentially detect forces on the scale of tens of femto-Newtons and center of mass displacements of less than 10 nm. This work provides a non-invasive method of conducting position and vibration measurements in the field of levitodynamics without the ultra-cold temperatures or bulky precision laser setups that superconducting quantum interference devices and conventional interferometric methods utilize.

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Characterizing low-frequency vibratory motion with radio-frequency cavities

Hart-Alesch,

Sharping

2024

Journal of Applied Physics

View full text Add to dashboard Cite

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Characterization of a levitated sub-milligram ferromagnetic cube in a planar alternating-current magnetic Paul trap

Janse,

van der Bent,

Laurman

et al. 2024

Applied Physics Letters

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Microscopic levitated objects are a promising platform for inertial sensing, testing gravity at small scales, optomechanics in the quantum regime, and large-mass superpositions. However, existing levitation techniques harnessing optical and electrical fields suffer from noise induced by elevated internal temperatures and charge noise, respectively. Meissner-based magnetic levitation circumvents both sources of decoherence but requires cryogenic environments. Here, we characterize a sub-milligram ferromagnetic cube levitated in an alternating-current planar magnetic Paul trap at room temperature. We show behavior in line with the Mathieu equations and quality factors of up to 2500 for the librational modes. Besides technological sensing applications, this technique sets out a path for megahertz librational modes in the micrometer-sized particle limit and can be extended by implementing superconducting traps in cryogenic environments, allowing for magnetic coupling to superconducting circuits and spin-based quantum systems.

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Stable magnetic levitation of soft ferromagnets for macroscopic quantum mechanics

Fuwa

2023

Phys. Rev. A

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Superconducting Microsphere Magnetically Levitated in an Anharmonic Potential with Integrated Magnetic Readout

Cited by 12 publications

References 71 publications

Characterizing low-frequency vibratory motion with radio-frequency cavities

Characterizing low-frequency vibratory motion with radio-frequency cavities

Characterization of a levitated sub-milligram ferromagnetic cube in a planar alternating-current magnetic Paul trap

Stable magnetic levitation of soft ferromagnets for macroscopic quantum mechanics

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