Brookes, Paul;
(2021)
Protected states and metastable dynamics in superconducting circuits.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
The twin fields of superconducting circuits and circuit quantum electrodynamics now form the basis for a major part of the effort towards building a quantum computer. Yet many fundamental problems remain. These may range from very practical considerations, such as how to construct a qubit with a sufficiently long coherence time, to questions of how best to understand and model the complex nonlinear dynamics arising in superconducting circuits. In this thesis we take a broad look at these fields and explore many questions within them. We begin by studying critical slowing down in a dissipative phase transition of a coupled qubit-cavity system, before examining the underlying dynamics of switching between metastable states which causes this slowdown. We then examine an unexplained phenomenon of resonance narrowing in another qubit-cavity system and suggest it may also be related to metastable states. Finally, we examine a circuit which harnesses long range interactions, and present it as a promising candidate for building a qubit with a long coherence time.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Protected states and metastable dynamics in superconducting circuits |
| Event: | UCL (University College London) |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2021. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10130287 |
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