Robust Quantum Gates for a Singlet-Triplet Spin Qubit

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RIBEIRO, Hugo, Jason R. PETTA, Guido BURKARD, 2012. Robust Quantum Gates for a Singlet-Triplet Spin Qubit

@unpublished{Ribeiro2012Robus-21780, title={Robust Quantum Gates for a Singlet-Triplet Spin Qubit}, year={2012}, author={Ribeiro, Hugo and Petta, Jason R. and Burkard, Guido} }

<rdf:RDF xmlns:dcterms="" xmlns:dc="" xmlns:rdf="" xmlns:bibo="" xmlns:dspace="" xmlns:foaf="" xmlns:void="" xmlns:xsd="" > <rdf:Description rdf:about=""> <dcterms:issued>2012</dcterms:issued> <dc:creator>Petta, Jason R.</dc:creator> <dcterms:title>Robust Quantum Gates for a Singlet-Triplet Spin Qubit</dcterms:title> <dc:contributor>Ribeiro, Hugo</dc:contributor> <foaf:homepage rdf:resource="http://localhost:8080/jspui"/> <dcterms:rights rdf:resource=""/> <dcterms:abstract xml:lang="eng">We show that universal quantum control of a two-electron singlet-triplet spin qubit can be achieved using Landau-Zener-St\"uckelberg interferometry. Going beyond normal Landau-Zener dynamics with infinitely long constant velocity sweeps across an energy level anti-crossing, we focus on a physical system consisting of a two-electron double quantum dot, where the spin states can be admixtures of charge states and the level velocity can be tuned in a time-dependent fashion. Our results indicate that charge coherence must be treated on an equal footing with spin coherence. In particular, we predict the presence of finite-time effects, which result in population transfer even in cases of an incomplete sweep through the anti-crossing. The competing requirements of adiabaticity and coherence are reconciled using specially designed pulses with a tunable level velocity. As a relevant example, we demonstrate that a Hadamard gate can be implemented for a realistic set of conditions in a GaAs double quantum dot device.</dcterms:abstract> <dc:language>eng</dc:language> <dc:date rdf:datatype="">2013-02-13T16:21:40Z</dc:date> <dcterms:available rdf:datatype="">2013-02-13T16:21:40Z</dcterms:available> <dc:creator>Ribeiro, Hugo</dc:creator> <dc:rights>terms-of-use</dc:rights> <dc:creator>Burkard, Guido</dc:creator> <bibo:uri rdf:resource=""/> <dc:contributor>Petta, Jason R.</dc:contributor> <dc:contributor>Burkard, Guido</dc:contributor> <dcterms:isPartOf rdf:resource=""/> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dspace:isPartOfCollection rdf:resource=""/> </rdf:Description> </rdf:RDF>

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