Type of Publication: | Preprint |
Author: | Ribeiro, Hugo; Petta, Jason R.; Burkard, Guido |
Year of publication: | 2012 |
ArXiv-ID: | arXiv:1210.1957 |
Summary: |
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.
|
Subject (DDC): | 530 Physics |
Bibliography of Konstanz: | Yes |
Files | Size | Format | View |
---|---|---|---|
There are no files associated with this item. |
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@unpublished{Ribeiro2012Robus-21780, title={Robust Quantum Gates for a Singlet-Triplet Spin Qubit}, year={2012}, author={Ribeiro, Hugo and Petta, Jason R. and Burkard,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="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:void="http://rdfs.org/ns/void#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/21780"> <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="https://rightsstatements.org/page/InC/1.0/"/> <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="http://www.w3.org/2001/XMLSchema#dateTime">2013-02-13T16:21:40Z</dc:date> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">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="http://kops.uni-konstanz.de/handle/123456789/21780"/> <dc:contributor>Petta, Jason R.</dc:contributor> <dc:contributor>Burkard, Guido</dc:contributor> <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/41"/> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/41"/> </rdf:Description> </rdf:RDF>