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Backaction suppression in levitated optomechanics / RAFAL GAJEWSKI

Swansea University Author: RAFAL GAJEWSKI

DOI (Published version): 10.23889/SUThesis.67075

Abstract

In this thesis, we show that the backaction noise acting on a small nanosphere levitated in a standing-wave trap can be considerably reduced by utilising a suitable reflective boundary. We examine the spherical mirror geometry as a case study of this backaction suppression effect, discussing the theor...

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Published: Swansea University, Wales, UK 2024
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Bateman, J. E.
URI: https://cronfa.swan.ac.uk/Record/cronfa67075
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first_indexed 2024-07-11T15:01:24Z
last_indexed 2024-07-11T15:01:24Z
id cronfa67075
recordtype RisThesis
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spelling v2 67075 2024-07-11 Backaction suppression in levitated optomechanics 4cda22511a7144da29f2a25bebdde133 RAFAL GAJEWSKI RAFAL GAJEWSKI true false 2024-07-11 In this thesis, we show that the backaction noise acting on a small nanosphere levitated in a standing-wave trap can be considerably reduced by utilising 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 model the backaction noise by computing the spectral density of force fluctuations acting on the particle trapped at the centre of a spherical mirror. We also compute the corresponding measurement imprecision in an interferometric, shot-noise-limited position measurement and show that backaction and imprecision agree, recovering the Heisenberg limit of detection. The remainder of the thesis is devoted to analysis and a report on the construction of two novel trapping configurations which could be used to study the backaction suppression effect. E-Thesis Swansea University, Wales, UK Physics 21 6 2024 2024-06-21 10.23889/SUThesis.67075 A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information. COLLEGE NANME COLLEGE CODE Swansea University Bateman, J. E. Doctoral Ph.D EPSRC EPSRC 2024-07-11T16:06:01.9360029 2024-07-11T15:56:00.0326292 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences RAFAL GAJEWSKI 1 67075__30888__f3d674d9ea3c4e799ba81782ba31c7b5.pdf 2024_Gajewski_R.final.67065.pdf 2024-07-11T16:00:09.8021365 Output 26850493 application/pdf E-Thesis – open access true Copyright: The Author, Rafal Gajewski, 2024 true eng
title Backaction suppression in levitated optomechanics
spellingShingle Backaction suppression in levitated optomechanics
RAFAL GAJEWSKI
title_short Backaction suppression in levitated optomechanics
title_full Backaction suppression in levitated optomechanics
title_fullStr Backaction suppression in levitated optomechanics
title_full_unstemmed Backaction suppression in levitated optomechanics
title_sort Backaction suppression in levitated optomechanics
author_id_str_mv 4cda22511a7144da29f2a25bebdde133
author_id_fullname_str_mv 4cda22511a7144da29f2a25bebdde133_***_RAFAL GAJEWSKI
author RAFAL GAJEWSKI
author2 RAFAL GAJEWSKI
format E-Thesis
publishDate 2024
institution Swansea University
doi_str_mv 10.23889/SUThesis.67075
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
active_str 0
description In this thesis, we show that the backaction noise acting on a small nanosphere levitated in a standing-wave trap can be considerably reduced by utilising 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 model the backaction noise by computing the spectral density of force fluctuations acting on the particle trapped at the centre of a spherical mirror. We also compute the corresponding measurement imprecision in an interferometric, shot-noise-limited position measurement and show that backaction and imprecision agree, recovering the Heisenberg limit of detection. The remainder of the thesis is devoted to analysis and a report on the construction of two novel trapping configurations which could be used to study the backaction suppression effect.
published_date 2024-06-21T16:06:01Z
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score 11.016079

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