Coupled quantum dots as quantum gates


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BURKARD, Guido, Daniel LOSS, David P. DIVINCENZO, 1999. Coupled quantum dots as quantum gates. In: Physical Review(B59), pp. 2070-2078. Available under: doi: 10.1103/PhysRevB.59.2070

@article{Burkard1999Coupl-4838, title={Coupled quantum dots as quantum gates}, year={1999}, doi={10.1103/PhysRevB.59.2070}, number={B59}, journal={Physical Review}, pages={2070--2078}, author={Burkard, Guido and Loss, Daniel and DiVincenzo, David P.} }

<rdf:RDF xmlns:dcterms="" xmlns:dc="" xmlns:rdf="" xmlns:bibo="" xmlns:dspace="" xmlns:foaf="" xmlns:void="" xmlns:xsd="" > <rdf:Description rdf:about=""> <foaf:homepage rdf:resource="http://localhost:8080/jspui"/> <dspace:isPartOfCollection rdf:resource=""/> <dcterms:title>Coupled quantum dots as quantum gates</dcterms:title> <bibo:uri rdf:resource=""/> <dspace:hasBitstream rdf:resource=""/> <dc:date rdf:datatype="">2011-03-24T14:50:42Z</dc:date> <dc:rights>terms-of-use</dc:rights> <dc:creator>Burkard, Guido</dc:creator> <dcterms:bibliographicCitation>First publ. in: arXiv:cond-mat/9808026 [cond-mat.mes-hall], also publ. in: Physical Review (1999), B59, pp. 2070-2078</dcterms:bibliographicCitation> <dcterms:rights rdf:resource=""/> <dc:language>eng</dc:language> <dcterms:isPartOf rdf:resource=""/> <dc:format>application/pdf</dc:format> <dc:contributor>Loss, Daniel</dc:contributor> <dc:creator>Loss, Daniel</dc:creator> <dcterms:issued>1999</dcterms:issued> <dcterms:available rdf:datatype="">2011-03-24T14:50:42Z</dcterms:available> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dcterms:hasPart rdf:resource=""/> <dcterms:abstract xml:lang="eng">We consider a new quantum gate mechanism based on electron spins in coupled semiconductor quantum dots. Such gates provide a general source of spin entanglement and can be used for quantum computers. We determine the exchange coupling J in the effective Heisenberg model as a function of magnetic (B) and electric fields, and of the inter-dot distance a within the Heitler-London approximation of molecular physics. This result is refined by using sp-hybridization, and by the Hund-Mulliken molecular-orbit approach which leads to an extended Hubbard description for the two-dot system that shows a remarkable dependence on B and a due to the long-range Coulomb interaction. We find that the exchange J changes sign at a finite field (leading to a pronounced jump in the magnetization) and then decays exponentially. The magnetization and the spin susceptibilities of the coupled dots are calculated. We show that the dephasing due to nuclear spins in GaAs can be strongly suppressed by dynamical nuclear spin polarization and/or by magnetic fields.</dcterms:abstract> <dc:contributor>DiVincenzo, David P.</dc:contributor> <dc:creator>DiVincenzo, David P.</dc:creator> <dc:contributor>Burkard, Guido</dc:contributor> </rdf:Description> </rdf:RDF>

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