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dc.contributor.advisorJevon , Longdell
dc.contributor.authorBarnett, Peter
dc.date.available2020-11-09T01:28:40Z
dc.date.copyright2020
dc.identifier.urihttp://hdl.handle.net/10523/10507
dc.description.abstractThe subject of this thesis is coherent conversion from microwave photons to optical photons. This has applications for quantum computing, and would allow interfacing between superconducting qubits and optical fibres. Specifically, we will focus on photon conversion via erbium ions in a doped crystal. We model a device which has an erbium doped crystal inside overlapping microwave and optical cavities. Input microwave photons are combined with photons from an optical pump laser via interactions with the erbium ions. This will produce optical output photons carrying the same quantum information as the input microwave photons. We develop a description of the interaction between the atoms and the light fields, accounting for both loss effects in the single atoms, and inhomogeneous broadening of the ensemble. Our theory is compared with experimental data, and shows good agreement. We explore various phenomena which arise in this system, including the effects of temperature and microwave power. It is shown that the description of this device from earlier work is not valid in the regime where the conversion efficiency is greatest. Hence, this work is necessary to be able to predict the maximum conversion efficiency. We develop a linearised model which is accurate in the regime where the microwave and optical fields are small, such as the regime used for quantum information. This model is used to maximise the photon number conversion efficiency of the device. We predict conversion efficiencies above 20%, far higher than has been achieved experimentally with using rare earth ions. Modifying our device should further increase the conversion efficiency to above 80%.
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherUniversity of Otago
dc.rightsAll items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectQuantum
dc.subjectUpconversion
dc.subjectDoped crystals
dc.subjectRare earth ions
dc.subjectQuantum Network
dc.subjectQuantum Information
dc.subjectQuantum Theory
dc.subjectNumerical Integration
dc.titleTheory of Microwave to Optical Photon Upconversion Using Erbium Doped Crystals
dc.typeThesis
dc.date.updated2020-11-08T23:27:14Z
dc.language.rfc3066en
thesis.degree.disciplinePhysics
thesis.degree.nameMaster of Science
thesis.degree.grantorUniversity of Otago
thesis.degree.levelMasters
otago.openaccessOpen
otago.evidence.presentYes
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