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Hittade 10 dokument
Transport through Magnetic Molecules with SpinVibron Interaction
Kenawy, Ahmed
Examensarbete på avancerad nivå, 2016 (Masterarbete)
Electronic transport through singlemolecule devices is a powerful spectroscopic tool to probe various degrees of freedom at the nanoscopic level. Among these degrees of freedom, molecular vibrations are of particular relevance since they can result in drastic effects such as transportblockade. While the effect of the interaction between the molecular charge...
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Characterisation and optimisation of superconducting microwave resonators
Boehme, Thijs
Examensarbete på avancerad nivå, 2016 (MSc  Nanotechnology)
In this master's thesis, I present the design, fabrication, and characterisation of superconducting microwave resonators. These resonators are quarterwavelength coplanar waveguide resonators, operating at resonance frequencies between 4 GHz and 8 GHz. This kind of resonator is a key component in several applications, ranging from quantum computation devices...
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Tunneling Theory for FewBody Systems in OneDimensional Traps
Lundmark, Rikard
Examensarbete på avancerad nivå, 2014 (MSc  Physics and Astronomy)
In recent experiments, carried out at the University of Heidelberg, tunneling rates of ultracold distinguishable fermions out of an optomagnetical trap have been measured. The fermions interact by a tunable shortranged interaction,and the trap is asymmetric making the trapped quantum systemeffectively onedimensional. In this thesis, a method for calculatin...
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Fabrication and Characterisation of ThinFilm Superconducting Nanowire Superinductors for Novel Quantum Devices
Niepce, David
Examensarbete på avancerad nivå, 2014 (MSc  Nanotechnology)
In this master's thesis, we present the design, fabrication and characterisation of superconducting thinfilm nanowire superinductances for use in quantum information processing and quantum metrology. In order to characterise the superconducting nanowire, it is placed inside a stepimpedance lambda/2 microwave resonator.In a stepimpedance resonator, the str...
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Photon generation in a doubly tunable resonator
Svensson, IdaMaria
Examensarbete på avancerad nivå, 2012 (Civilingenjör)
In November 2011 the first experimental observation of the dynamical Casimir effect waspublished [1]. Superconducting circuits were used to show that a single mirror movingin vacuum could generate photons, by parametric amplification of vacuum uctuations.This project is a side track of this research where a second mirror is introduced to investigatephoton ge...
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Paint it Black – To Protect the Qubits
Fredriksson, Mattias; Svensson, Simon; Holmgren, Henning
Examensarbete på grundnivå, 2012 (Högskoleingenjör)
This thesis deals with reducing quasiparticle generation in superconducting circuits caused by stray photons by utilizing electromagnetic absorbers. This thesis deals with reducing quasiparticle generation in superconducting circuits caused by stray photons by utilizing electromagnetic absorbers. Quasiparticle generation is a known problem in several superco...
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Fabrication of airbridges for qubit design
Abuwasib, Mohammad
Examensarbete på avancerad nivå, 2011 (Masterarbete)
Superconducting quantum electrical circuit based on Coplanar waveguide technology is considered one of the most promising candidates for practical realization of aquantum computer in future. For purpose of designing a multiqubit quantum processor which is the heart of a quantum computer, it is required to couple qubits to a large number of superconducting...
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Parallel Computations of Vortex Core Structures in Superconductors
Wennerdal, Niclas
Examensarbete på avancerad nivå, 2011 (Masterarbete)
In this master thesis the properties of an isolated vortex offlux quantum one in $s$wave superconductors is investigated. This isdone by solving the Eilenberger transport equation for the quasiclassicalMatsubara propagator in the extreme clean limit. The local density of states(LDOS) inthe vortex center is calculated and the KramerPesch effect is demonstr...
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Circuit Theory of Mesoscopic Superconducting Components
Kellett, Ian
Examensarbete på avancerad nivå, 2011 (Masterarbete)
Nazarov's quantum circuit theory is essentially a discretised version of the Usadel equation which describes mesoscopic superconducting systems in the diffusive limit.The focus of this thesis project was to investigate the application of the quantum circuit theory to an Andreev interferometer.The report begins with a review of classical transport theory and...
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Investigation of Transmon Qubit Designs  A Study of Plasma Frequency Predictability
Krantz, Philip
Examensarbete på avancerad nivå, 2010 (MSc  Nanotechnology)
This master thesis was dedicated to design, fabricate, and characterize subsystems of superconducting transmon qubits. Especially, focus was on investigating the predictability of the plasma frequency of the transmon, from which its operational properties are govern. In turn, the plasma frequency is governed by the normal state resistance of the two Josephso...
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