Controlling the motional quality factor of a diamagnetically levitated graphite plate

Romagnoli, Priscila; Lecamwasam, Ruvi; Tian, S.; Downes, James E.; Twamley, J.

doi:10.1063/5.0133242

Cited by 5 publications

(1 citation statement)

References 53 publications

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“…In this work, we consider a levitated opto-magnomechanical setup as depicted in Fig. 1, where a mirror is diamagnetically levitated in an inhomogeneous magnetic field generated by two opposing magnets separated by a distance d. Diamagnetic levitation can be achieved at room temperature by placing the mirror on diamagnetic graphite trapped between checkerboard magnet arrays [26], or at low temperatures by placing the mirror on Type I or II superconductors whose diamagnetism is six orders of magnitude larger than that of graphite [27,28]. This setup allows the mechanical frequency of the mirror oscillation to depend on the separation distance, d, between the magnet layers.…”

Section: Optomechanical Modelmentioning

confidence: 99%

Zeptometer displacement sensing using cavity opto-magneto-mechanics

Iakovleva¹,

Sarma²,

Twamley³

2023

Preprint

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Optomechanical systems have been proven to be very useful for precision sensing of a variety of forces and effects. In this work, we propose an opto-magnomechanical setup for spatial displacement sensing where one mirror of the optical cavity is levitated in vacuum via diamagnetic forces in an inhomogenous magnetic field produced by two layers of permanent magnets. We show that the optomechanical system can sense small changes in separation between the magnet layers, as the mechanical frequency of the levitated mirror shifts with changing magnet layer separation d.We use Quantum Fisher Information (QFI) as a figure of merit of the displacement sensing precision, and study the fundamental precision bound that can be reached in our setup. Nonlinear interaction inherently present in the optomechanical Hamiltonian improves the precision, and we show that in the case of a pure state of the optical cavity, one can achieve extremely small displacement sensing precision of ∆d ∼ 36 × 10 −21 m. Further, we incorporate decoherence into our system to study the effect of leaking photons from the optical cavity on the QFI.

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Section: Optomechanical Modelmentioning

confidence: 99%

Zeptometer displacement sensing using cavity opto-magneto-mechanics

Iakovleva¹,

Sarma²,

Twamley³

2023

Preprint

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Feedback cooling of an insulating high-Q diamagnetically levitated plate

Tian,

Jadeja,

Kim

et al. 2024

Applied Physics Letters

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Levitated systems in vacuum have many potential applications ranging from new types of inertial and magnetic sensors through to fundamental issues in quantum science, the generation of massive Schrödinger cats, and the connections between gravity and quantum physics. In this work, we demonstrate the passive, diamagnetic levitation of a centimeter-sized massive oscillator, which is fabricated using a method that ensures that the material, though highly diamagnetic, is an electrical insulator. Electrical conductors moving in a magnetic field experience eddy damping—which can severely reduce their motional quality factor. By chemically coating a powder of microscopic graphite beads with silica and embedding the coated powder in high-vacuum compatible wax, we form a centimeter-sized thin square plate which magnetically levitates over a checkerboard magnet array. The insulating coating reduces eddy damping by almost an order of magnitude compared to uncoated graphite with the same particle size. These plates exhibit a different equilibrium orientation from pyrolytic graphite due to their isotropic magnetic susceptibility. We measure the motional quality factor to be Q∼1.58×105 for an approximately centimeter-sized composite resonator with a mean particle size of 12 μm. Furthermore, we apply delayed feedback to cool the vertical motion of frequency ∼19 Hz and achieve center-of-mass temperature decrease by three orders of magnitude.

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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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Controlling the motional quality factor of a diamagnetically levitated graphite plate

Cited by 5 publications

References 53 publications

Zeptometer displacement sensing using cavity opto-magneto-mechanics

Zeptometer displacement sensing using cavity opto-magneto-mechanics

Feedback cooling of an insulating high-Q diamagnetically levitated plate

Characterizing low-frequency vibratory motion with radio-frequency cavities

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