Flux Noise due to Spins in SQUIDs

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dc.contributor.authorLaForest, Stephanie
dc.contributor.supervisorDe Sousa, Rogério Costa Reis
dc.date.accessioned2013-08-20T22:39:44Z
dc.date.available2013-08-20T22:39:44Z
dc.date.copyright2013en_US
dc.date.issued2013-08-20
dc.degree.departmentDept. of Physics and Astronomyen_US
dc.degree.levelMaster of Science M.Sc.en_US
dc.description.abstractSuperconducting Quantum Interference Devices (SQUIDs) are currently being used as flux qubits and read-out detectors in a variety of solid-state quantum computer architectures. The main limitation of SQUID qubits is that they have a coherence time of the order of 10 us, due to the presence of intrinsic flux noise that is not yet fully understood. The origin of flux noise is currently believed to be related to spin impurities present in the materials and interfaces that form the device. Here we present a novel numerical method that enables calculations of the flux produced by spin impurities even when they are located quite close to the SQUID wire. We show that the SQUID will be particularly sensitive to spins located at its wire edges, generating flux shifts of up to 4 nano flux quanta, much higher than previous calculations based on the software package FastHenry. This shows that spin impurities in a particular region along the wire's surface play a much more important role in producing flux noise than other spin impurities located elsewhere in the device.en_US
dc.description.proquestcode0611en_US
dc.description.proquestcode0607en_US
dc.description.proquestcode0753en_US
dc.description.proquestemaillaforest@uvic.caen_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/4810
dc.languageEnglisheng
dc.language.isoenen_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.subjectPhysicsen_US
dc.subjectSuperconductorsen_US
dc.subjectSQUIDsen_US
dc.subjectFlux Noiseen_US
dc.subjectFlux Quantizationen_US
dc.subjectJosephson Relationsen_US
dc.subjectCondensed Matteren_US
dc.subjectQuantum Computingen_US
dc.subjectAdiabatic Quantum Computingen_US
dc.subjectQuantum Mechanicsen_US
dc.titleFlux Noise due to Spins in SQUIDsen_US
dc.typeThesisen_US

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