Fabrication and Characterisation of Thin-Film Superconducting Nanowire Superinductors for Novel Quantum Devices

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dc.contributor.authorNiepce, David
dc.contributor.departmentChalmers tekniska högskola / Institutionen för mikroteknologi och nanovetenskapsv
dc.contributor.departmentChalmers University of Technology / Department of Microtechnology and Nanoscienceen
dc.date.accessioned2019-07-03T13:32:40Z
dc.date.available2019-07-03T13:32:40Z
dc.date.issued2014
dc.description.abstractIn this master's thesis, we present the design, fabrication and characterisation of superconducting thin-film nanowire superinductances for use in quantum information processing and quantum metrology. In order to characterise the superconducting nanowire, it is placed inside a step-impedance lambda/2 microwave resonator. In a step-impedance resonator, the strong wave impedance mismatch between the feed lines (50 ohm) and the nanowire (ca. 5 kohm) results in the formation of standing waves within the resonator. By measuring the transmission and reflection parameters of the resonator, we can probe the nanowire properties. We have shown that the high kinetic inductance of thin NbN films can be used to fabricate superinductors that exhibit an inductance two to three orders of magnitude larger than an ordinary geometric inductance of the same size. An inductance of 787 nH is demonstrated for a 200nm x 1mm nanowire. This corresponds to a reactive microwave impedance of 25 kohm at 5 GHz, which is higher than the resistance quantum h/(4e^2) = 6.5 kohm.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/204895
dc.language.isoeng
dc.setspec.uppsokPhysicsChemistryMaths
dc.subjectMaterialvetenskap
dc.subjectNanovetenskap och nanoteknik
dc.subjectFysik
dc.subjectSupraledning
dc.subjectLågtemperaturfysik
dc.subjectMesoskopisk fysik
dc.subjectNanoteknik
dc.subjectTeknisk fysik
dc.subjectMaterials Science
dc.subjectNanoscience & Nanotechnology
dc.subjectPhysical Sciences
dc.subjectSuperconductivity
dc.subjectLow temperature physics
dc.subjectMesoscopic physics
dc.subjectNano Technology
dc.subjectEngineering physics
dc.titleFabrication and Characterisation of Thin-Film Superconducting Nanowire Superinductors for Novel Quantum Devices
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster Thesisen
dc.type.uppsokH
local.programmeNanotechnology (MPNAT), MSc
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