dc.identifier.uri |
http://dx.doi.org/10.15488/9179 |
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dc.identifier.uri |
https://www.repo.uni-hannover.de/handle/123456789/9232 |
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dc.contributor.author |
Steinmeyer, Daniel
|
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dc.date.accessioned |
2020-01-06T10:28:37Z |
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dc.date.available |
2020-01-06T10:28:37Z |
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dc.date.issued |
2019 |
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dc.identifier.citation |
Steinmeyer, Daniel: Subsystems for all-optical coherent quantum-noise cancellation. Hannover : Gottfried Wilhelm Leibniz Universität, Diss., 2019, xv, 245 S. DOI: https://doi.org/10.15488/9179 |
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dc.description.abstract |
Quantum mechanics dictates that a measurement always disturb the measured system. In weak continuous measurements, the trade-off between measurement precision and back-action onto the system yields an optimal measurement sensitivity, which is known as the Standard Quantum Limit (SQL) in opto-mechanical measurements, such as gravitational-wave detection. It corresponds to finding the optimal optical power in a compromise between quantum shot noise and quantum radiation-pressure noise. Coherent quantum-noise cancellation (CQNC) aims at overcoming the SQL and reducing back-action noise via the introduction of an effective negative-mass oscillator. In an alloptical set-up, this oscillator is realised by a detuned optical resonator coupled to incoming light with a beam-splitter and a down-conversion interaction and needs to be matched to the measured system in resonance frequency, damping and coupling strengths.
This thesis explores the nature of CQNC and a potential all-optical realisation in theory and experiment, with a particular emphasis on the beam-splitter and the down-conversion interaction. Two possible set-ups are compared theoretically and critical parameters determined. Available opto-mechanical devices were characterised and confirmed to be suitable for CQNC.
The down-conversion coupling strength gDC is linked to experimentally obtainable parameters. More than 2.3 dB reduction in uncertainty of two-mode squeezed light were observed. The squeezing measurements yielded gDC = 2\pi\times200 kHz at 100mW pump power, which is well within the initially required range and is in agreement with results from two other measurement methods.
Optical resonators coupled via a beam-splitter interaction are studied theoretically and experimentally. In this work, the beam-splitter interaction of strength gBS was realised by a wave plate. A simplified experiment design enabled stabilisation of the coupled resonators. Our experimental observations accurately confirmed our theoretical predictions. The observed mode splitting yielded gBS = 2\pi\times235 kHz, within the updated requirements.
Losses and a limited measurement strength will be the limiting factors for CQNC. The updated set of parameters, backed by the conducted experiments, paves the way towards a reduction of radiation-pressure noise of up to 4.8 dB. |
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dc.language.iso |
eng |
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dc.publisher |
Hannover : Institutionelles Repositorium der Leibniz Universität Hannover |
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dc.rights |
CC BY 3.0 DE |
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dc.rights.uri |
http://creativecommons.org/licenses/by/3.0/de/ |
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dc.subject |
coherent quantum-noise cancellation |
eng |
dc.subject |
standard quantum limit |
eng |
dc.subject |
two-mode squeezed light |
eng |
dc.subject |
coupled optical resonators |
eng |
dc.subject |
kohärente Quantenrauschunterdrückung |
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dc.subject |
Standardquantenlimit |
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dc.subject |
zwei-Moden-gequetschtes Licht |
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dc.subject |
gekoppelte optische Resonatoren |
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dc.subject.ddc |
530 | Physik
|
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dc.title |
Subsystems for all-optical coherent quantum-noise cancellation |
eng |
dc.type |
DoctoralThesis |
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dc.type |
Text |
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dcterms.extent |
xv, 245 S. |
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dc.description.version |
publishedVersion |
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tib.accessRights |
frei zug�nglich |
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