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dc.contributor.authorJafari Salim, Amir 16:39:18 (GMT) 05:00:13 (GMT)
dc.description.abstractIn this thesis, superconducting nanostructures for quantum detection of electromagnetic radiation are studied. In this regard, electrodynamics of topological excitations in 1D superconducting nanowires and 2D superconducting nanostrips is investigated. Topological excitations in superconducting nanowires and nanostrips lead to crucial deviation from the bulk properties. In 1D superconductors, topological excitations are phase slippages of the order parameter in which the magnitude of the order parameter locally drops to zero and the phase jumps by integer multiple of 2\pi. We investigate the effect of high-frequency field on 1D superconducting nanowires and derive the complex conductivity. Our study reveals that the rate of the quantum phase slips (QPSs) is exponentially enhanced under high-frequency irradiation. Based on this finding, we propose an energy-resolving terahertz radiation detector using superconducting nanowires. In superconducting nanostrips, topological fluctuations are the magnetic vortices. The motion of magnetic vortices result in dissipative processes that limit the efficiency of devices using superconducting nanostrips. It will be shown that in a multi-layer structure, the potential barrier for vortices to penetrate inside the structure is elevated. This results in significant reduction in dissipative process. In superconducting nanowire single photon detectors (SNSPDs), vortex motion results in dark counts and reduction of the critical current which results in low efficiency in these detectors. Based on this finding, we show that a multi-layer SNSPD is capable of approaching characteristics of an ideal single photon detector in terms of the dark count and quantum efficiency. It is shown that in a multi-layer SNSPD the photon coupling efficiency is dramatically enhanced due to the increase in the optical path of the incident photon.en
dc.publisherUniversity of Waterlooen
dc.subjectsuperconducting nanostructuresen
dc.subjectsuperconducting nanowiresen
dc.subjectsuperconducting nanostripsen
dc.subjectcomplex conductivityen
dc.subjectenhancement of quantum tunnellingen
dc.subjectenergy resolving detectoren
dc.subjectsuperconducting nanowire single photon detector (SNSPD)en
dc.subjectmulti-layer superconducting nanostructureen
dc.subjectpancake vortexen
dc.subjectdark counten
dc.subjectphoton absorptionen
dc.subjectquantum efficiencyen
dc.subjectsemi-classical physicsen
dc.subjectGolubev-Zaikin theoryen
dc.subjectphase slipsen
dc.subjectquantum tunnellingen
dc.subjectvortex crossingen
dc.subjectMooij-Nazarov dualityen
dc.subjectterahertz (THz) detectoren
dc.subjectquantum phase slip (QPS)en
dc.titleSuperconducting Nanostructures for Quantum Detection of Electromagnetic Radiationen
dc.typeDoctoral Thesisen
dc.subject.programElectrical and Computer Engineering (Quantum Information)en
dc.description.embargoterms4 monthsen and Computer Engineeringen
uws-etd.degreeDoctor of Philosophyen

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