Non-local electrodynamics of superconducting wires: implications for flux noise and inductance

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dc.contributor.author Senarath Yapa Arachchige, Pramodh Viduranga
dc.date.accessioned 2017-12-22T19:59:29Z
dc.date.available 2017-12-22T19:59:29Z
dc.date.copyright 2017 en_US
dc.date.issued 2017-12-22
dc.identifier.uri http://hdl.handle.net/1828/8914
dc.description.abstract The simplest model for superconductor electrodynamics are the London equations, which treats the impact of electromagnetic fields on the current density as a localized phenomenon. However, the charge carriers of superconductivity are quantum mechanical objects, and their wavefunctions are delocalized within the superconductor, leading to non-local effects. The Pippard equation is the generalization of London electrodynamics which incorporates this intrinsic non-locality through the introduction of a new superconducting characteristic length, \xi_0, called the Pippard coherence length. When building nano-scale superconducting devices, the inclusion of the coherence length into electrodynamics calculations becomes paramount. In this thesis, we provide numerical calculations of various electrodynamic quantities of interest in the non-local regime, and discuss their implications for building superconducting devices. We place special emphasis on Superconducting QUantum Inteference Devices (SQUIDs), and their usage as flux quantum bits (qubits) in quantum computation. One of the main limitations of these flux qubits is the presence of intrinsic flux noise, which leads to decoherence of the qubits. Although the origin of this flux noise is not known, there is evidence that it is related to spin impurities within the superconducting material. We present calculations which show that the flux noise in the non-local regime is signi cantly different from the local case. We also demonstrate that non-local electrodynamics greatly affect the self-inductance of the qubit. en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.subject superconductivity en_US
dc.subject quantum computing en_US
dc.subject qubit en_US
dc.subject flux noise en_US
dc.subject electrodynamics en_US
dc.subject SQUID en_US
dc.subject Superconductor en_US
dc.subject Pippard en_US
dc.subject non-local electrodynamics en_US
dc.subject inductance en_US
dc.title Non-local electrodynamics of superconducting wires: implications for flux noise and inductance en_US
dc.type Thesis en_US
dc.contributor.supervisor De Sousa, Rogério Costa Reis
dc.degree.department Department of Physics and Astronomy en_US
dc.degree.level Master of Science M.Sc. en_US
dc.description.scholarlevel Graduate en_US

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