Browsing NTNU Open by Author "Danon, Jeroen"
Now showing items 1-20 of 22
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Andreev bound states in Josephson junctions: unconventional pairing symmetries in weak magnetic field and strong-field formalism
Brøyn, Anna Ursula Birkeland (Master thesis, 2017)The supercurrent in the normal region of a superconductor - normal metal - superconductor structure (SNS), when exposed to an external magnetic field, is studied. The current is found via the energy levels of the Andreev ... -
Characterization of a proximity-mediated magnon–exciton coupling in a ferromagnet/transition metal dichalcogenide van der Waals heterostructure
Sund, Patrik Isene (Master thesis, 2020)Sterk kobling mellom heterogene kvantesystemer kan brukes til å konstruere hybridkvantesystemer, der de unike egenskapene til de individuelle systemene kan anvendes for innovative muligheter. Denne tesen gjør rede for et ... -
Charge and spin textures of Ising quantum Hall ferromagnet domain walls
Danon, Jeroen; Balram, Ajit C.; Sánchez, Samuel; Rudner, Mark S. (Journal article; Peer reviewed, 2019)We investigate the charge and spin structures associated with arbitrary smooth polarization textures in Ising (integer) quantum Hall ferromagnets. We consider the case where the two polarizations (denoted “pseudospin” up ... -
Controlling nuclear field gradients intriple quantum dot by Landau-Zener sweeps
Estensen, Ola Nielsen (Master thesis, 2019)Trippel-spin kvanteprikker i GaAs har tidligere blitt foreslått som kandidat til kvante bit. Begrensningene til slike systemer følger av den hyperfine interaksjonen mellom elektronene og atomkjernene i vertsmaterialet, som ... -
Effects of Hyperfine and Spin Orbit interaction in multiple-spin qubits
Qvist, Jørgen Holme (Doctoral theses at NTNU;2022:248, Doctoral thesis, 2022)Norsk sammendrag Interaksjoner i spinn-baserte kvantebits Gjennom de siste tiårene har det vært en eksponentiell progresjon i utviklingen av mikroelektronikk. Dette har ført til radikale fremskritt i en rekke teknologier ... -
Enhancement of proximity-induced superconductivity in a planar Ge hole gas
Aggarwal, Kushagra; Hofmann, Andrea; Jirovec, Daniel; Prieto, Ivan; Sammak, Amir; Botifoll, Marc; Marti-Sanchez, Sara; Veldhorst, Menno; Arbiol, Jordi; Scapucci, Giordano; Danon, Jeroen; Katsaros, Georgios (Peer reviewed; Journal article, 2021)Hole gases in planar germanium can have high mobilities in combination with strong spin-orbit interaction and electrically tunable g factors, and are therefore emerging as a promising platform for creating hybrid ... -
Exchange-only, nuclear spin-free qubits in semiconductor quantum dots
Cadellans, Arnau Sala (Doctoral theses at NTNU;2020:255, Doctoral thesis, 2020)There are many successful proposals for using electron spins in quantum dots as qubits. However, a semiconductor quantum dot-based qubit that is scalable, reliable and robust enough for actual quantum information applications ... -
Ferromagnetically mediated singlet-triplet qubit coupling
Finnseth, Øyvind (Master thesis, 2022)Utviklingen mot realiseringen av kvantedatamaskiner er avhengig av forståelsen og utviklingen av passende fysiske systemer hvor kvantebits kan konstrueres. Å møte kravene for et slikt system er dog en betydelig ... -
Few-Electron Single and Double Quantum Dots in an InAs Two-Dimensional Electron Gas
Mittag, Christopher; Koski, Jonne V.; Karalic, Matija; Thomas, Candice; Tuaz, Aymeric; Hatke, Anthony T.; Gardner, Geoffrey C.; Manfra, Michael J.; Danon, Jeroen; Ihn, Thomas; Ensslin, Klaus (Peer reviewed; Journal article, 2021)Most proof-of-principle experiments for spin qubits have been performed with GaAs-based quantum dots because of the excellent control they offer over tunneling barriers and the orbital and spin degrees of freedom. Here we ... -
Highly tunable exchange-only singlet-only qubit in a GaAs triple quantum dot
Sala Cadellans, Arnau; Qvist, Jørgen Holme; Danon, Jeroen (Peer reviewed; Journal article, 2020)We propose an implementation of a singlet-only spin qubit in a GaAs-based triple quantum dot with a (1, 4, 1) charge occupation. In the central multielectron dot, the interplay between Coulomb interaction and an out-of-plane ... -
Hybrid devices for protected quantum information processing
Lidal, Jonas (Doctoral theses at NTNU;2023:260, Doctoral thesis, 2023)Quantum information is very fragile, and it is clear that we need to develop better qubits and employ error correction, in order to make use of the full potential that quantum computation has. In this thesis we explore ... -
Leakage and dephasing in 28Si-based exchange-only spin qubits
Sala, Arnau; Danon, Jeroen (Journal article; Peer reviewed, 2018)Exchange-only spin qubits hosted in 28Si-based triple quantum dots do not suffer from decoherence caused by randomly fluctuating nuclear-spin ensembles and can be relatively robust against electrical noise when operated ... -
Monte Carlo studies of phase transitions in unconventional and two-dimensional superconductors
Haugen, Håvard Homleid (Doctoral theses at NTNU;2023:52, Doctoral thesis, 2023)In this thesis we present three research articles on phase transitions and related phenomena in unconventional and two-dimensional superconductors, within the field of condensed matter physics. It contains an introductory ... -
Photon-assisted Landau-Zener transitions in driven few-level systems
Lidal, Jonas (Master thesis, 2019)I denne avhandlinga utforskar me Landau-Zener overgangar i drivne få-nivå system. Me behandlar drivingsfeltet både semi-klassisk (som ein tidsavhengig parameter i Hamilton operatoren) og heilt kvantemekanisk (som eit ... -
Probing Majorana localization in minimal Kitaev chains through a quantum dot
Souto, Rubén Seoane; Tsintzis, Athanasios; Leijnse, Martin; Danon, Jeroen (Peer reviewed; Journal article, 2023)Artificial Kitaev chains, formed by quantum dots coupled via superconductors, have emerged as a promising platform for realizing Majorana bound states. Even a minimal Kitaev chain (a quantum dot–superconductor–quantum dot ... -
PROCESSING AND PROPERTY ENGINEERING OF DOMAINS AND DOMAIN WALLS IN HEXAGONAL MANGANITES
Haas, Max (Master thesis, 2022)Topologisk beskyttede objekter har vakt oppmerksomhet innen mange forskningsom- råder. Fra kvantebiter til skyrmioner, fra superflytende helium til det tidlige universet, topologi spiller en avgjørende rolle. Det er ikke ... -
Quantum Error Mitigation for near-future Quantum Computation
Rokne, Anders Håøy (Master thesis, 2021)Kvantedatamaskiner har potensiale til å kunne løse spesifikke beregningsproblemer eksponentielt raskere enn noen klassisk datamaskin er i stand til. I nærliggende fremtid er derimot kvantedatamaskiner begrensede når det ... -
Quantum Machine Learning for Variational Quantum Algorithms
Uthayamoorthy, VIroshaan (Master thesis, 2022)Denne masteroppgaven introduserer konsepter innen maskinlæring og kvante-maskinlæring. Spesiell fokus vil bli ilagt variasjonelle kvantealgorithmer hvor parametre i kvantekretser blir optimert. Hvordan disse kretsene trenes ... -
Semiclassical theory of a disordered two-dimensional SNS-junction
Gerrard, Nicolai (Master thesis, 2018)Two-dimensional hybrid superconductor-semiconductor structures provide a promising platform for realising networks of Majorana fermions for fault-tolerant quantum computing, and, as such, are attracting a lot of ... -
Study of a Triangular-Domain Topological Qubit Model with Edge disorder
Høye, Osmund (Master thesis, 2022)Topologi for faste stoffer er et eksotisk felt som kan få viktige implikasjoner for kvanteberegninger. Måten nåværende kvantedatamaskiner implementeres fysisk lider av korte koherenstider og medførende høye feilrater. ...