Measurement of the neutrality of matter using levitated microparticles at the standard quantum limit

Lorenzo Magrini

doi:10.1117/12.2676859

5 October 2023 Measurement of the neutrality of matter using levitated microparticles at the standard quantum limit

Lorenzo Magrini

Proceedings Volume PC12649, Optical Trapping and Optical Micromanipulation XX; PC126490I (2023) https://doi.org/10.1117/12.2676859
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

Optically levitated nano and microparticles are excellent force sensors and are used in many tests of fundamental physics, from probing the quantum mechanical properties of massive objects to modifications of gravity a small distances. Another possibility is to test the neutrality of matter, i.e. equivalence in magnitude of the charge of protons and electrons, or the existence of mini charges. Experiments with neutral levitated microparticles have so far excluded the abundance of mini-charged particles in matter to less than 10^(-5) e^- [Moore et al.]. Limitation to such measurements have been the backgrounds induced by permanent dipole moments and the noise floor. We report on a new experiment combining permanent dipole cancellation [Priel et al.] with an improved detection scheme [Mauer et al.] resulting in state of the art sensitivity on the abundance of minicharge particles and the neutrality of matter .

Conference Presentation

Citation Download Citation

Lorenzo Magrini "Measurement of the neutrality of matter using levitated microparticles at the standard quantum limit", Proc. SPIE PC12649, Optical Trapping and Optical Micromanipulation XX, PC126490I (5 October 2023); https://doi.org/10.1117/12.2676859

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