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Hydrogenic Spin Quantum Computing in Silicon and Damping and Diffusion in a Chain-Boson Model

dc.contributor.advisorHu, Bei-Loken_US
dc.contributor.authorSkinner, Andrew J.en_US
dc.date.accessioned2006-09-12T05:59:52Z
dc.date.available2006-09-12T05:59:52Z
dc.date.issued2006-08-08en_US
dc.identifier.urihttp://hdl.handle.net/1903/3887
dc.description.abstractWe propose an architecture for quantum computing with spin-pair encoded qubits in silicon. Electron-nuclear spin-pairs are controlled by a DC magnetic field and electrode-switched on and off hyperfine interaction. This digital processing is insensitive to tuning errors and easy to model. Electron shuttling between donors enables multi-qubit logic. These hydrogenic spin qubits are transferable to nuclear spin-pairs, which have long coherence times, and electron spin-pairs, which are ideally suited for measurement and initialization. The architecture is scaleable to highly parallel operation. We also study the open-system dynamics of a few two-level systems coupled together and embedded in a crystal lattice. In one case, superconducting quantum interference devices, or SQUIDs, exchange their angular momenta with the lattice. Some decaying oscillations can emerge in a lower energy subspace with a longer coherence time. In another case, the exchange coupling between spins-1/2 is strained by lattice distortions. At a critical point energy level crossing, four well-spaced spins dissipate collectively. This is partially true also for the two- or three-SQUID-chain. These collective couplings can improve coherence times.en_US
dc.format.extent1459028 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.titleHydrogenic Spin Quantum Computing in Silicon and Damping and Diffusion in a Chain-Boson Modelen_US
dc.typeDissertationen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentPhysicsen_US
dc.subject.pqcontrolledPhysics, Condensed Matteren_US
dc.subject.pqcontrolledPhysics, Generalen_US
dc.subject.pquncontrolledQuantum Computingen_US
dc.subject.pquncontrolledDecoherenceen_US
dc.subject.pquncontrolledRelaxationen_US
dc.subject.pquncontrolledOpen-Systemsen_US
dc.subject.pquncontrolledSpin-Chainsen_US
dc.subject.pquncontrolledQuantum Brownian Motionen_US


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