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Backaction suppression in levitated optomechanics using reflective boundaries

Rafal Gajewski, James Bateman Orcid Logo

Physical Review Research, Volume: 7, Issue: 2, Start page: 023041

Swansea University Authors: Rafal Gajewski, James Bateman Orcid Logo

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DOI (Published version): 10.1103/physrevresearch.7.023041

Abstract

We show theoretically that the noise due to laser induced backaction acting on a small nanosphere levitated in a standing-wave trap can be considerably reduced by utilizing a suitable reflective boundary. We examine the spherical mirror geometry as a case study of this backaction suppression effect,...

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Published in: Physical Review Research
ISSN: 2643-1564
Published: American Physical Society (APS) 2025
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa69040
Abstract: We show theoretically that the noise due to laser induced backaction acting on a small nanosphere levitated in a standing-wave trap can be considerably reduced by utilizing a suitable reflective boundary. We examine the spherical mirror geometry as a case study of this backaction suppression effect, discussing the theoretical and experimental constraints. We study the effects of laser recoil directly, by analyzing optical force fluctuations acting on a dipolar particle trapped at the center of a spherical mirror. We also compute the corresponding measurement imprecision in an interferometric, shot-noise-limited position measurement, using the formalism of Fisher information flow. Our results show that the standing-wave trapping field is necessary for backaction suppression in three dimensions, and they satisfy the Heisenberg limit of detection.
College: Faculty of Science and Engineering
Funders: R.G. was supported by the U.K. Engineering and Physical Sciences Research Council through a Standard Research Studentship (Doctoral Training Partnership) Grant No. EP/T517987/1.
Issue: 2
Start Page: 023041

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