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Superconducting quantum circuits based on disordered aluminum films
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Kamenov, Plamen. Superconducting quantum circuits based on disordered aluminum films. Retrieved from https://doi.org/doi:10.7282/t3-wrgf-pb03

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TitleSuperconducting quantum circuits based on disordered aluminum films
NameKamenov, Plamen (author); Gershenson, Michael (chair); Coleman, Piers (member); Schnetzer, Stephen (member); Kiryukhin, Valery (member); Koch, Jens (member); Rutgers University; School of Graduate Studies
Date Created2023
Other Date2023-01 (degree)
SubjectQuantum physics, Disordered superconductor, Granular aluminum, Kinetic inductance, Quasiparticle poisoning
Extent152 pages : illustrations
DescriptionAluminum is a material widely used for superconducting devices due to its self-limiting oxide and low loss at microwave frequencies. Granular Aluminum is a type of disordered Aluminum which can be used for high kinetic inductance elements in quantum circuits protected from the flux-noise-induced decay and dephasing, such as the bifluxon qubit. In the first part of this thesis, the focus is on characterization of circuits made of granular Aluminum. Granular Aluminum superinductors are implemented into circuits with low loss and high environmental impedance. In the second part, the suppression of tunneling of nonequilibrium quasiparticles (“quasiparticle poisoning”) in Josephson-junction-based qubits is discussed. Quasiparticle poisoning is a source of decoherence which limits the effectiveness of error correction codes. By taking advantage of the dependence of the superconducting gap in Aluminum films on film thickness and disorder, potential barriers that reduce nonequilibrium quasiparticles (NQP) near the junctions are implemented. Suppression of quasiparticle poisoning results in improvement of coherence of the transmon qubits, the leading platform for implementation of the surface error correction codes.
NotePh.D.
NoteIncludes bibliographical references
Genretheses
Persistent URLhttps://doi.org/doi:10.7282/t3-wrgf-pb03
LanguageEnglish
CollectionSchool of Graduate Studies Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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