Controlling the net charge on a nanoparticle optically levitated in vacuum

Abstract

Optically levitated nanoparticles in vacuum are a promising model system to test physics beyond our current understanding of quantum mechanics. Such experimental tests require extreme control over the dephasing of the levitated particle's motion. If the nanoparticle carries a finite net charge, it experiences a random Coulomb force due to fluctuating electric fields. This dephasing mechanism can be fully excluded by discharging the levitated particle. Here, we present a simple and reliable technique to control the charge on an optically levitated nanoparticle in vacuum. Our method is based on the generation of charges in an electric discharge and does not require additional optics or mechanics close to the optical trap.

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• Quantum-induced Stochastic Optomechanical Dynamics
• Roto-translational optomechanics
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• Control and measurement of electric dipole moments in levitated optomechanics
• Super-extended nanofiber-guided field for coherent interaction with hot atoms
• Optical potential mapping with a levitated nanoparticle at sub-wavelength distances from a membrane
• Quantum Physics in Space
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• Single-atom detection with a quantum-controlled mechanical oscillator