Ferraiuolo, Raffaella (2024) Superconducting Hybrid Quantum Systems for Quantum Computing. [Tesi di dottorato]
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| Tipologia del documento: | Tesi di dottorato |
|---|---|
| Lingua: | English |
| Titolo: | Superconducting Hybrid Quantum Systems for Quantum Computing |
| Autori: | Autore Email Ferraiuolo, Raffaella raffaella.ferraiuolo@unina.it |
| Data: | 2024 |
| Numero di pagine: | 118 |
| Istituzione: | Università degli Studi di Napoli Federico II |
| Dipartimento: | Fisica |
| Dottorato: | Quantum Technologies (Tecnologie Quantistiche) |
| Ciclo di dottorato: | 36 |
| Coordinatore del Corso di dottorato: | nome email Tafuri, Francesco francesco.tafuri@unina.it |
| Tutor: | nome email Montemurro, Domenico [non definito] |
| Data: | 2024 |
| Numero di pagine: | 118 |
| Parole chiave: | Ferromagnetic Josephson Junction, Superconducting quantum circuit, Superconducting Qubit |
| Settori scientifico-disciplinari del MIUR: | Area 02 - Scienze fisiche > FIS/03 - Fisica della materia |
| Depositato il: | 14 Mar 2024 18:54 |
| Ultima modifica: | 12 Ago 2026 05:36 |
| URI: | https://www.fedoa.unina.it/id/eprint/15598 |
Abstract
Remarkable progress has been made in quantum computing and quantum information science over the past decade, with a focus on the emergence of superconducting qubits as a leading paradigm. While these qubits demonstrate efficiency and flexibility, they still exhibit certain architectural issues, prompting exploration into hybrid superconducting systems. Notably, the integration of ferromagnetic barriers with superconductors offers additional control over qubit frequencies, leading to the development of hybrid ferromagnetic transmon qubits, or ferro-transmons. The research delves into the magnetotransport properties of Ferromagnetic Josephson Junctions (MJJ), specifically tunnel MJJs with a serial connection of a tunnel junction (SIs) and ferromagnetic ones (sFS). Utilizing niobium and aluminum technologies, the study uncovers a rich phenomenology dependent on material and geometry choices. These findings hold promise for integration into hybrid circuits, contributing to the evolution of quantum circuits. Additionally, the investigation extends to the Superconducting Quantum Circuit, focusing on Coplanar Waveguide Resonators (CPW) as versatile components in qubit architecture. Design and simulation efforts establish the relationship between resonator geometry and key features. Finally, the proposal to design a tunable resonator integrating Ferromagnetic Josephson Junctions is presented as a crucial aspect of the research. The thesis further explores hybrid junctions beyond MJJs, introducing a pioneering project involving a Josephson Junction with a Van der Waals material, specifically 1T-TaS2. This material exhibits a gate effect in its phase diagram, potentially inducing unconventional superconducting states through proximity effects. This innovative approach opens avenues for integrating with traditional superconducting qubits. In summary, the thesis aims to advance the realization of the superconducting hybrid circuit "ferro-transmon" by investigating the magnetotransport properties of MJJs and the Superconducting Quantum Circuit to enhance the capabilities of quantum circuits. In addition, a focus is paid to novel materials, such as Van der Waals materials, as a new platform to explore unconventional superconducting states.
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