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Spin decoherence in nanodiamond and digital signal processing for quantum sensing and magnetometry
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Stimpson, Guy Anthony (2020) Spin decoherence in nanodiamond and digital signal processing for quantum sensing and magnetometry. PhD thesis, University of Warwick.
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WRAP_Theses_Stimpson_2020.pdf - Submitted Version - Requires a PDF viewer. Download (37Mb) | Preview |
Official URL: http://webcat.warwick.ac.uk/record=b3763694~S15
Abstract
This thesis presents research into the characteristics necessary for diamond and nanodiamond in the application of optically detected magnetic resonance (ODMR) for sensitive magnetic field detection, magnetocardiography, quantum computing and fundamental physics research and also addresses digital signal processing requirements for some of these applications.
Firstly, an open source, high frequency lock-in amplifier is presented, along with characterisation that demonstrates a sensitivity of 90 n V/√Hz and a maximum demodulation frequency of 50 MHz. This device is compared with a commercial alternative, and its suitability for diamond magnetometry in magnetocardiography is discussed. Secondly, confocal fluorescence microscopy measurements of nitrogen vacancy centres in high purity nanodiamond are presented, along with a discussion of the nanoparticles' suitability for fundamental physics experiments. T2 spin-spin
decoherence times of up to 120 µs are reported, achieved using the spin echo method, twenty times longer than previous research using high yield nanodiamonds. These experiments were performed on nanodiamonds deposited on a custom designed silicon substrate marked with a simple grid for location enabling the measurement of specific nanodiamonds not only in confocal fluorescence but also under scanning electron microscopy. Finally, progress is made towards optical trapping of these nanodiamonds for the investigation of the macroscopicity of particles in a spatial quantum superposition. Trapping frequencies of 220 kHz using an aspheric lens were
achieved, and a three-axis Helmholtz coil was constructed and thermally tested in
aid of applying ODMR to trapped nanodiamonds.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TP Chemical technology |
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Library of Congress Subject Headings (LCSH): | Nanodiamonds, Signal processing -- Digital techniques, Magnetic resonance, Magnetic fields | ||||
Official Date: | February 2020 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Physics | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Morley, Gavin | ||||
Extent: | xxvi, 189 leaves : illustrations, charts. | ||||
Language: | eng |
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